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 <front>
  <journal-meta>
   <journal-id journal-id-type="publisher-id">Food Processing: Techniques and Technology</journal-id>
   <journal-title-group>
    <journal-title xml:lang="en">Food Processing: Techniques and Technology</journal-title>
    <trans-title-group xml:lang="ru">
     <trans-title>Техника и технология пищевых производств</trans-title>
    </trans-title-group>
   </journal-title-group>
   <issn publication-format="print">2074-9414</issn>
   <issn publication-format="online">2313-1748</issn>
  </journal-meta>
  <article-meta>
   <article-id pub-id-type="publisher-id">105010</article-id>
   <article-id pub-id-type="doi">10.21603/2074-9414-2025-3-2590</article-id>
   <article-categories>
    <subj-group subj-group-type="toc-heading" xml:lang="ru">
     <subject>ОРИГИНАЛЬНАЯ СТАТЬЯ</subject>
    </subj-group>
    <subj-group subj-group-type="toc-heading" xml:lang="en">
     <subject>ORIGINAL ARTICLE</subject>
    </subj-group>
    <subj-group>
     <subject>ОРИГИНАЛЬНАЯ СТАТЬЯ</subject>
    </subj-group>
   </article-categories>
   <title-group>
    <article-title xml:lang="en">Production of Galacto-Oligosaccharides Using Kluyveromyces Yeast</article-title>
    <trans-title-group xml:lang="ru">
     <trans-title>Особенности получения галактоолигосахаридов с использованием дрожжей Kluyveromyces</trans-title>
    </trans-title-group>
   </title-group>
   <contrib-group content-type="authors">
    <contrib contrib-type="author">
     <contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-9803-8709</contrib-id>
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Рябцева</surname>
       <given-names>Светлана Андреевна</given-names>
      </name>
      <name xml:lang="en">
       <surname>Ryabtseva</surname>
       <given-names>Svetlana A.</given-names>
      </name>
     </name-alternatives>
     <email>ryabtseva07@mail.ru</email>
     <xref ref-type="aff" rid="aff-1"/>
    </contrib>
    <contrib contrib-type="author">
     <contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0119-9061</contrib-id>
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Шпак</surname>
       <given-names>Мария Александровна</given-names>
      </name>
      <name xml:lang="en">
       <surname>Shpack</surname>
       <given-names>Maria A.</given-names>
      </name>
     </name-alternatives>
     <xref ref-type="aff" rid="aff-2"/>
    </contrib>
    <contrib contrib-type="author">
     <contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-8200-3007</contrib-id>
     <name-alternatives>
      <name xml:lang="ru">
       <surname>Сазанова</surname>
       <given-names>Серафима Николаевна</given-names>
      </name>
      <name xml:lang="en">
       <surname>Sazanova</surname>
       <given-names>Serafima N.</given-names>
      </name>
     </name-alternatives>
     <xref ref-type="aff" rid="aff-3"/>
    </contrib>
   </contrib-group>
   <aff-alternatives id="aff-1">
    <aff>
     <institution xml:lang="ru">Северо-Кавказский федеральный университет</institution>
     <city>Ставрополь</city>
     <country>Россия</country>
    </aff>
    <aff>
     <institution xml:lang="en">North-Caucasus Federal University</institution>
     <city>Stavropol</city>
     <country>Russian Federation</country>
    </aff>
   </aff-alternatives>
   <aff-alternatives id="aff-2">
    <aff>
     <institution xml:lang="ru">Северо-Кавказский федеральный университет</institution>
     <city>Ставрополь</city>
     <country>Россия</country>
    </aff>
    <aff>
     <institution xml:lang="en">North-Caucasus Federal University</institution>
     <city>Stavropol</city>
     <country>Russian Federation</country>
    </aff>
   </aff-alternatives>
   <aff-alternatives id="aff-3">
    <aff>
     <institution xml:lang="ru">Северо-Кавказский федеральный университет</institution>
     <city>Ставрополь</city>
     <country>Россия</country>
    </aff>
    <aff>
     <institution xml:lang="en">North-Caucasus Federal University</institution>
     <city>Stavropol</city>
     <country>Russian Federation</country>
    </aff>
   </aff-alternatives>
   <pub-date publication-format="print" date-type="pub" iso-8601-date="2025-08-05T00:00:00+03:00">
    <day>05</day>
    <month>08</month>
    <year>2025</year>
   </pub-date>
   <pub-date publication-format="electronic" date-type="pub" iso-8601-date="2025-08-05T00:00:00+03:00">
    <day>05</day>
    <month>08</month>
    <year>2025</year>
   </pub-date>
   <volume>55</volume>
   <issue>3</issue>
   <fpage>581</fpage>
   <lpage>606</lpage>
   <history>
    <date date-type="received" iso-8601-date="2025-06-18T00:00:00+03:00">
     <day>18</day>
     <month>06</month>
     <year>2025</year>
    </date>
    <date date-type="accepted" iso-8601-date="2025-07-21T00:00:00+03:00">
     <day>21</day>
     <month>07</month>
     <year>2025</year>
    </date>
   </history>
   <self-uri xlink:href="https://fptt.ru/en/issues/23788/23830/">https://fptt.ru/en/issues/23788/23830/</self-uri>
   <abstract xml:lang="ru">
    <p>Галактоолигосахариды обладают пребиотической активностью, их получают из лактозы с использованием бета-галактозидаз бактериального или грибного происхождения. Цель обзора – выявление и анализ факторов, влияющих на биосинтез и очистку галактоолигосахаридов, с использованием бета-галактозидаз дрожжей рода Kluyveromyces, а также перспективных направлений исследований в этой области.&#13;
Объектами исследования стали научные публикации по вопросам получения галактоолигосахаридов с использованием бета-галактозидаз дрожжей. Для поиска информации были использованы международные базы данных Scopus, Web of Science, PubMed, eLIBRARY.RU Для анализа было отобрано 87 источников, в основном статьи в рецензируемых журналах, опубликованные преимущественно за последние 10 лет.&#13;
Выбор фермента и формы его применения, оптимизация условий биосинтеза и очистки являются наиболее важными для регулирования выхода, состава и свойств анализируемых веществ. Бета-галактозидазы из Kluyveromyces могут одновременно катализировать реакции гидролиза и трансгалактозилирования. Условия протекания процессов биосинтеза галактоолигосахаридов с этими ферментами широко варьируют в разных публикациях, как и их выход, но чаще всего этот показатель не превышает 30–40 %, при этом общая конверсия лактозы достигает 80–90 %. Применение бета-галактозидаз Kluyveromyces в виде цельноклеточных ферментов, в иммобилизованной форме или совместно с другими ферментами позволяет улучшить экономические показатели процессов биосинтеза и / или выход и / или структуру рассматриваемых веществ. Прямой их синтез в молоке или сыворотке дает возможность получать новые функциональные молочные продукты и добавки. Селективная биоконверсия с дрожжами Kluyveromyces позволяет повысить чистоту галактоолигосахаридов до 90 % экономически выгодным и экологически безопасным путем.&#13;
К перспективным направлениям можно отнести использование побочного молочного сырья для получения продуктов с галактоолигосахаридами, комбинированное применение ферментов разных продуцентов, а также комплексное применение бета-галактозидаз Kluyveromyces для их биосинтеза и очистки.</p>
   </abstract>
   <trans-abstract xml:lang="en">
    <p>Galacto-oligosaccharides are known for their prebiotic activity. They are obtained from lactose using bacterial or fungal betagalactosidases. This article describes the factors that affect the biosynthesis and purification of galacto-oligosaccharides using Kluyveromyces yeasts, as well as summarizes some prospective research areas in this sphere. &#13;
The research covered ten years of scientific publications on the production of galacto-oligosaccharides with yeast beta-galactosidases. The review pool included 87 articles published in peer-reviewed journals and registered in Scopus, Web of Science, PubMed, and eLIBRARY.RU.&#13;
The yield, composition, and properties of galacto-oligosaccharides depend on the enzyme, its application, biosynthesis optimization, and purification conditions. Beta-galactosidases from Kluyveromyces can simultaneously catalyze hydrolysis and transgalactosylation reactions. The biosynthesis conditions vary a lot across the review pool, as does the yield of galacto-oligosaccharides, which usually remains below 30–40% while the total lactose conversion reaches 80–90%. Kluyveromyces beta-galactosidases can be used as whole-cell enzymes in immobilized form or together with other enzymes. They improve the economic indicators of biosynthesis, and / or the yield and / or the structure of galacto-oligosaccharides. If synthesized directly in milk or whey, galacto-oligosaccharides may yield new functional dairy products and additives. The method of selective bioconversion with Kluyveromyces yeast brings the purity of galacto-oligosaccharides up to 90% in an economical and sustainable way.&#13;
Eventually, galacto-oligosaccharides can be obtained from dairy by-products. Other promising areas include the enzymic mixes of different producers, as well as a comprehensive use of Kluyveromyces beta-galactosidases for galacto-oligosaccharide biosynthesis and purification.</p>
   </trans-abstract>
   <kwd-group xml:lang="ru">
    <kwd>Лактоза</kwd>
    <kwd>бета-галактозидазы</kwd>
    <kwd>Kluyveromyces</kwd>
    <kwd>трансгалактозилирование</kwd>
    <kwd>гидролиз</kwd>
    <kwd>молочная сыворотка</kwd>
    <kwd>очистка</kwd>
   </kwd-group>
   <kwd-group xml:lang="en">
    <kwd>Lactose</kwd>
    <kwd>beta-galactosidases</kwd>
    <kwd>Kluyveromyces</kwd>
    <kwd>transgalactosylation</kwd>
    <kwd>hydrolysis</kwd>
    <kwd>whey</kwd>
    <kwd>purification</kwd>
   </kwd-group>
   <funding-group>
    <funding-statement xml:lang="ru">Исследование выполнено за счет гранта Российского научного фонда № 25-26-20093, https://rscf.ru/project/25-26-20093/</funding-statement>
    <funding-statement xml:lang="en">The work was supported by the grant of the Russian Science Foundation No. 25-26-20093, https://rscf.ru/project/25-26-20093/</funding-statement>
   </funding-group>
  </article-meta>
 </front>
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  <p></p>
 </body>
 <back>
  <ref-list>
   <ref id="B1">
    <label>1.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Souza AFC, Gabardo S, de Jesus Silva Coelho R. Galactooligosaccharides: Physiological benefits, production strategies, and industrial application. Journal of Biotechnology. 2022;359:116-129. https://doi.org/10.1016/j.jbiotec.2022.09.020</mixed-citation>
     <mixed-citation xml:lang="en">Souza AFC, Gabardo S, de Jesus Silva Coelho R. Galactooligosaccharides: Physiological benefits, production strategies, and industrial application. Journal of Biotechnology. 2022;359:116-129. https://doi.org/10.1016/j.jbiotec.2022.09.020</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B2">
    <label>2.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Ambrogi V, Bottacini F, Cao L, Kuipers B, Schoterman M, et al. Galacto-oligosaccharides as infant prebiotics: Production, application, bioactive activities and future perspectives. Critical Reviews in Food Science and Nutrition. 2023;63(6): 753-766. https://doi.org/10.1080/10408398.2021.1953437</mixed-citation>
     <mixed-citation xml:lang="en">Ambrogi V, Bottacini F, Cao L, Kuipers B, Schoterman M, et al. Galacto-oligosaccharides as infant prebiotics: Production, application, bioactive activities and future perspectives. Critical Reviews in Food Science and Nutrition. 2023;63(6):753-766. https://doi.org/10.1080/10408398.2021.1953437</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B3">
    <label>3.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Global galactooligosaccharides market overview. Market Research Future. [cited 2025 Mar 27]. Available from: https://www.marketresearchfuture.com/reports/galactooligosaccharides-market-22433</mixed-citation>
     <mixed-citation xml:lang="en">Global galactooligosaccharides market overview. Market Research Future. [cited 2025 Mar 27]. Available from: https://www.marketresearchfuture.com/reports/galactooligosaccharides-market-22433</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B4">
    <label>4.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Martins GN, Ureta MM, Tymczyszyn EE, Castilho PC, Gomez-Zavaglia A. Technological aspects of the production of fructo and galacto-oligosaccharides. Enzymatic synthesis and hydrolysis. Frontiers in Nutrition. 2019;6:78. https://doi.org/10.3389/fnut.2019.00078</mixed-citation>
     <mixed-citation xml:lang="en">Martins GN, Ureta MM, Tymczyszyn EE, Castilho PC, Gomez-Zavaglia A. Technological aspects of the production of fructo and galacto-oligosaccharides. Enzymatic synthesis and hydrolysis. Frontiers in Nutrition. 2019;6:78. https://doi.org/10.3389/fnut.2019.00078</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B5">
    <label>5.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Guerrero C, Vera C, Illanes A. Optimisation of synthesis of oligosaccharides derived from lactulose (fructosyl-galacto-oligosaccharides) with β-galactosidases of different origin. Food Chemistry. 2013;138(4):2225-2232. https://doi.org/10.1016/j.foodchem.2012.10.128</mixed-citation>
     <mixed-citation xml:lang="en">Guerrero C, Vera C, Illanes A. Optimisation of synthesis of oligosaccharides derived from lactulose (fructosyl-galacto- oligosaccharides) with β-galactosidases of different origin. Food Chemistry. 2013;138(4):2225-2232. https://doi.org/10.1016/j.foodchem.2012.10.128</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B6">
    <label>6.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Arnold JW, Whittington HD, Dagher SF, Roach J, Azcarate-Peril MA, et al. Safety and modulatory effects of humanized galacto-oligosaccharides on the gut microbiome. Frontiers in Nutrition. 2021;8:640100. https://doi.org/10.3389/ fnut.2021.640100</mixed-citation>
     <mixed-citation xml:lang="en">Arnold JW, Whittington HD, Dagher SF, Roach J, Azcarate-Peril MA, et al. Safety and modulatory effects of humanized galacto-oligosaccharides on the gut microbiome. Frontiers in Nutrition. 2021;8:640100. https://doi.org/10.3389/fnut.2021.640100</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B7">
    <label>7.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Ignatova I, Arsov A, Petrova P, Petrov K. Prebiotic effects of α- and β-galactooligosaccharides: The structure-function relation. Molecules. 2025;30(4):803. https://doi.org/10.3390/molecules30040803</mixed-citation>
     <mixed-citation xml:lang="en">Ignatova I, Arsov A, Petrova P, Petrov K. Prebiotic effects of α- and β-galactooligosaccharides: The structure-function relation. Molecules. 2025;30(4):803. https://doi.org/10.3390/molecules30040803</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B8">
    <label>8.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Deshmukh N, Rao PS, Sharma H, Sathish Kumar MH, Naik NL, et al. Waste to nutrition: The evolution of whey, a byproduct to galactooligosaccharides production. Food Chemistry Advances. 2024;4:100642. https://doi.org/10.1016/j.focha.2024.100642</mixed-citation>
     <mixed-citation xml:lang="en">Deshmukh N, Rao PS, Sharma H, Sathish Kumar MH, Naik NL, et al. Waste to nutrition: The evolution of whey, a byproduct to galactooligosaccharides production. Food Chemistry Advances. 2024;4:100642. https://doi.org/10.1016/j.focha.2024.100642</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B9">
    <label>9.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Maraz A, Kovacs Z, Benjamins E, Pazmandi M. Recent developments in microbial production of high-purity galacto-oligosaccharides. World Journal of Microbiology and Biotechnology. 2022;38(6):95. https://doi.org/10.1007/s11274-022-03279-4</mixed-citation>
     <mixed-citation xml:lang="en">Maraz A, Kovacs Z, Benjamins E, Pazmandi M. Recent developments in microbial production of high-purity galacto-oligosaccharides. World Journal of Microbiology and Biotechnology. 2022;38(6):95. https://doi.org/10.1007/s11274-022-03279-4</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B10">
    <label>10.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Zolnere K, Ciprovica I. The comparison of commercially available β-galactosidases for dairy industry: Review. Food Science. Research for Rural Development. 2017;1:215-222. https://doi.org/10.22616/rrd.23.2017.032</mixed-citation>
     <mixed-citation xml:lang="en">Zolnere K, Ciprovica I. The comparison of commercially available β-galactosidases for dairy industry: Review. Food Science. Research for Rural Development. 2017;1:215-222. https://doi.org/10.22616/rrd.23.2017.032</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B11">
    <label>11.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Chen X, de Vos P. Structure-function relationship and impact on the gut-immune barrier function of non-digestible carbohydrates and human milk oligosaccharides applicable for infant formula. Critical Reviews in Food Science and Nutrition. 2024;64(23):8325-8345. https://doi.org/10.1080/10408398.2023.2199072</mixed-citation>
     <mixed-citation xml:lang="en">Chen X, de Vos P. Structure-function relationship and impact on the gut-immune barrier function of non-digestible carbohydrates and human milk oligosaccharides applicable for infant formula. Critical Reviews in Food Science and Nutrition. 2024;64(23):8325-8345. https://doi.org/10.1080/10408398.2023.2199072</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B12">
    <label>12.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Vera C, Guerrero C, Illanes A. Trends in lactose-derived bioactives: Synthesis and purification. Systems Microbiology and Biomanufacturing. 2022;2:393-412. https://doi.org/10.1007/s43393-021-00068-2</mixed-citation>
     <mixed-citation xml:lang="en">Vera C, Guerrero C, Illanes A. Trends in lactose-derived bioactives: Synthesis and purification. Systems Microbiology and Biomanufacturing. 2022;2:393-412. https://doi.org/10.1007/s43393-021-00068-2</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B13">
    <label>13.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Torres DPM, Goncalves M do PF, Teixeira JA, Rodrigues LR. Galacto-oligosaccharides: Production, properties, applications, and significance as prebiotics. Comprehensive Reviews in Food Science and Food Safety. 2010;9(5):438-454. https://doi.org/10.1111/j.1541-4337.2010.00119.x</mixed-citation>
     <mixed-citation xml:lang="en">Torres DPM, Goncalves M do PF, Teixeira JA, Rodrigues LR. Galacto-oligosaccharides: Production, properties, applications, and significance as prebiotics. Comprehensive Reviews in Food Science and Food Safety. 2010;9(5):438-454. https://doi.org/10.1111/j.1541-4337.2010.00119.x</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B14">
    <label>14.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">de Albuquerque TL, de Sousa M, Gomes E, Silva NC, Girao Neto CAC, et al. β-galactosidase from Kluyveromyces lactis: Characterization, production, immobilization and applications - A review. International Journal of Biological Macromolecules. 2021;191:881-898. https://doi.org/10.1016/j.ijbiomac.2021.09.133</mixed-citation>
     <mixed-citation xml:lang="en">de Albuquerque TL, de Sousa M, Gomes E, Silva NC, Girao Neto CAC, et al. β-galactosidase from Kluyveromyces lactis: Characterization, production, immobilization and applications - A review. International Journal of Biological Macromolecules. 2021;191:881-898. https://doi.org/10.1016/j.ijbiomac.2021.09.133</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B15">
    <label>15.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Лютова Л. В., Наумов Г. И., Шнырева А. В., Наумова Е. С. Молекулярный полиморфизм β-галактозидазных генов LAC4 у молочных и природных штаммов дрожжей Kluyveromyces. Молекулярная биология. 2021. Т. 55. № 1. С. 75-85. https://doi.org/10.31857/S0026898421010109</mixed-citation>
     <mixed-citation xml:lang="en">Lyutova LV, Naumov GI, Naumova ES, Shnyreva AV. Molecular polymorphism of β-galactosidase LAC4 genes in dairy and natural strains of Kluyveromyces yeasts. Molecular Biology. 2021;55(1):66-74. (In Russ.) https://doi.org/10.31857/ S0026898421010109</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B16">
    <label>16.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Лютова Л. В., Наумова Е. С. Межштаммовая гибридизация дрожжей Kluyveromyces lactis для создания штаммов, активно сбраживающих лактозу. Биотехнология. 2021. Т. 37. № 4. С. 43-50.  https://elibrary.ru/XZBKCB</mixed-citation>
     <mixed-citation xml:lang="en">Lyutova LV, Naumova ES. Inter-strain hybridization of Kluyveromyces lactis for creating efficient lactose-fermenting yeast. Biotekhnologiya. 2021;37(4):43-50. (In Russ.) https://elibrary.ru/XZBKCB</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B17">
    <label>17.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Лютова Л. В., Наумова Е. С. Сравнительный анализ сбраживания лактозы и ее компонентов, глюкозы и галактозы, межштаммовыми гибридами молочных дрожжей Kluyveromyces lactis. Биотехнология. 2023. T. 39. № 1. С. 3-11. https://doi.org/10.56304/s0234275823010064</mixed-citation>
     <mixed-citation xml:lang="en">Lyutova LV, Naumova ES. Comparative analysis of fermentation of lactose and its components, glucose and galactose, by interstrain hybrids of dairy yeast Kluyveromyces lactis. Biotekhnologiya. 2023;39(1):3-11. (In Russ.) https://doi.org/ 10.56304/s0234275823010064</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B18">
    <label>18.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Rodriguez-Colinas B, Fernandez-Arrojo L, Ballesteros AO, Plou FJ. Galactooligosaccharides formation during enzymatic hydrolysis of lactose: Towards a prebiotic-enriched milk. Food Chemistry. 2014;145:388-394. https://doi.org/10.1016/j.foodchem.2013.08.060</mixed-citation>
     <mixed-citation xml:lang="en">Rodriguez-Colinas B, Fernandez-Arrojo L, Ballesteros AO, Plou FJ. Galactooligosaccharides formation during enzymatic hydrolysis of lactose: Towards a prebiotic-enriched milk. Food Chemistry. 2014;145:388-394. https://doi.org/10.1016/j.foodchem.2013.08.060</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B19">
    <label>19.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Liburdi K, Esti M. Galacto-oligosaccharide (GOS) synthesis during enzymatic lactose-free milk production: State of the art and emerging opportunities. Beverages. 2022;8(2):21. https://doi.org/10.3390/beverages8020021</mixed-citation>
     <mixed-citation xml:lang="en">Liburdi K, Esti M. Galacto-oligosaccharide (GOS) synthesis during enzymatic lactose-free milk production: State of the art and emerging opportunities. Beverages. 2022;8(2):21. https://doi.org/10.3390/beverages8020021</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B20">
    <label>20.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Fischer C, Kleinschmidt T. Synthesis of galactooligosaccharides in milk and whey: A review. Comprehensive Reviews in Food Science and Food Safety. 2018;17(3):678-697. https://doi.org/10.1111/1541-4337.12344</mixed-citation>
     <mixed-citation xml:lang="en">Fischer C, Kleinschmidt T. Synthesis of galactooligosaccharides in milk and whey: A review. Comprehensive Reviews in Food Science and Food Safety. 2018;17(3):678-697. https://doi.org/10.1111/1541-4337.12344</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B21">
    <label>21.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Ganzle MG, Haase G, Jelen P. Lactose: Crystallization, hydrolysis and value-added derivatives. International Dairy Journal. 2008;18(7):685-694. https://doi.org/10.1016/j.idairyj.2008.03.003</mixed-citation>
     <mixed-citation xml:lang="en">Ganzle MG, Haase G, Jelen P. Lactose: Crystallization, hydrolysis and value-added derivatives. International Dairy Journal. 2008;18(7):685-694. https://doi.org/10.1016/j.idairyj.2008.03.003</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B22">
    <label>22.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Guerrero C, Vera C, Conejeros R, Illanes A. Transgalactosylation and hydrolytic activities of commercial preparations of β-galactosidase for the synthesis of prebiotic carbohydrates. Enzyme and Microbial Technology. 2015;70:9-17. https://doi.org/10.1016/j.enzmictec.2014.12.006</mixed-citation>
     <mixed-citation xml:lang="en">Guerrero C, Vera C, Conejeros R, Illanes A. Transgalactosylation and hydrolytic activities of commercial preparations of β-galactosidase for the synthesis of prebiotic carbohydrates. Enzyme and Microbial Technology. 2015;70:9-17. https://doi.org/10.1016/j.enzmictec.2014.12.006</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B23">
    <label>23.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Boger M, van Leeuwen SS, van Bueren AL, Dijkhuizen L. Structural identity of galactooligosaccharide molecules selectively utilized by single cultures of probiotic bacterial strains. Journal of Agricultural and Food Chemistry. 2019;67(50):13969- 13977. https://doi.org/10.1021/acs.jafc.9b05968</mixed-citation>
     <mixed-citation xml:lang="en">Boger M, van Leeuwen SS, van Bueren AL, Dijkhuizen L. Structural identity of galactooligosaccharide molecules selectively utilized by single cultures of probiotic bacterial strains. Journal of Agricultural and Food Chemistry. 2019;67(50):13969- 13977. https://doi.org/10.1021/acs.jafc.9b05968</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B24">
    <label>24.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">van Leeuwen SS, Kuipers BJH, Dijkhuizen L, Kamerling JP. Comparative structural characterization of 7 commercial galacto-oligosaccharide (GOS) products. Carbohydrate Research. 2016;425:48-58. https://doi.org/10.1016/j.carres.2016.03.006</mixed-citation>
     <mixed-citation xml:lang="en">van Leeuwen SS, Kuipers BJH, Dijkhuizen L, Kamerling JP. Comparative structural characterization of 7 commercial galacto-oligosaccharide (GOS) products. Carbohydrate Research. 2016;425:48-58. https://doi.org/10.1016/j.carres.2016.03.006</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B25">
    <label>25.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Logtenberg MJ, Donners KMH, Vink JCM, van Leeuwen SS, de Waard P, et al. Touching the high complexity of prebiotic vivinal galacto-oligosaccharides using porous graphitic carbon ultra-high-performance liquid chromatography coupled to mass spectrometry. Journal of Agricultural and Food Chemistry. 2020;68(29):7800-7808. https://doi.org/10.1021/acs.jafc.0c02684</mixed-citation>
     <mixed-citation xml:lang="en">Logtenberg MJ, Donners KMH, Vink JCM, van Leeuwen SS, de Waard P, et al. Touching the high complexity of prebiotic vivinal galacto-oligosaccharides using porous graphitic carbon ultra-high-performance liquid chromatography coupled to mass spectrometry. Journal of Agricultural and Food Chemistry. 2020;68(29):7800-7808. https://doi.org/10.1021/acs.jafc.0c02684</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B26">
    <label>26.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Kruschitz A, Nidetzky B. Downstream processing technologies in the biocatalytic production of oligosaccharides. Biotechnology Advances. 2020;43:107568. https://doi.org/10.1016/j.biotechadv.2020.107568</mixed-citation>
     <mixed-citation xml:lang="en">Kruschitz A, Nidetzky B. Downstream processing technologies in the biocatalytic production of oligosaccharides. Biotechnology Advances. 2020;43:107568. https://doi.org/10.1016/j.biotechadv.2020.107568</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B27">
    <label>27.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Cao T, Pazmandi M, Galambos I, Kovacs Z. Continuous production of galacto-oligosaccharides by an enzyme membrane reactor utilizing free enzymes. Membranes. 2020;10(9):203. https://doi.org/10.3390/membranes10090203</mixed-citation>
     <mixed-citation xml:lang="en">Cao T, Pazmandi M, Galambos I, Kovacs Z. Continuous production of galacto-oligosaccharides by an enzyme membrane reactor utilizing free enzymes. Membranes. 2020;10(9):203. https://doi.org/10.3390/membranes10090203</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B28">
    <label>28.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Botelho VA, Mateus M, Petrus JCC, de Pinho MN. Membrane bioreactor for simultaneous synthesis and fractionation of oligosaccharides. Membranes. 2022;12(2):171. https://doi.org/10.3390/membranes12020171</mixed-citation>
     <mixed-citation xml:lang="en">Botelho VA, Mateus M, Petrus JCC, de Pinho MN. Membrane bioreactor for simultaneous synthesis and fractionation of oligosaccharides. Membranes. 2022;12(2):171. https://doi.org/10.3390/membranes12020171</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B29">
    <label>29.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Cordova A, Astudillo C, Giorno L, Guerrero C, Conidi C, et al. Nanofltration potential for the purifcation of highly concentrated enzymatically produced oligosaccharides. Food and Bioproducts Processing 2016;98:50-61. https://doi.org/10.1016/j.fbp.2015.11.005</mixed-citation>
     <mixed-citation xml:lang="en">Cordova A, Astudillo C, Giorno L, Guerrero C, Conidi C, et al. Nanofltration potential for the purifcation of highly concentrated enzymatically produced oligosaccharides. Food and Bioproducts Processing 2016;98:50-61. https://doi.org/10.1016/j.fbp.2015.11.005</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B30">
    <label>30.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Information on EC 3.2.1.23 - beta-galactosidase. BRENDA. [cited 2025 Apr 21]. (In Russ.) Available from: https://www.brenda-enzymes.org/enzyme.php?ecno=3.2.1.23</mixed-citation>
     <mixed-citation xml:lang="en">Information on EC 3.2.1.23 - beta-galactosidase. BRENDA. [cited 2025 Apr 21]. (In Russ.) Available from: https://www.brenda-enzymes.org/enzyme.php?ecno=3.2.1.23</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B31">
    <label>31.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Храмцов А. Г., Рябцева С. А., Панфилова А. А., Родная А. Б., Лодыгин А. Д. Применение дрожжей-продуцентов бета-галактозидаз для получения галактоолигосахаридов из лактозосодержащего сырья. Хранение и переработка сельхозсырья. 2012. № 8. С. 36-39. https://elibrary.ru/PDHUFT</mixed-citation>
     <mixed-citation xml:lang="en">Khramtsov AG, Ryabtseva SA, Panfilova AA, Rodnaya AB, Lodygin AD. Yeast-producers of beta-galactosidases application for galactooligosaccharides production from lactose containing raw material. Storage and Processing of Farm Products. 2012;(8):36-39. (In Russ.) https://elibrary.ru/PDHUFT</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B32">
    <label>32.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Qiu Y, Lei P, Wang R, Sun L, Luo Z, et al. Kluyveromyces as promising yeast cell factories for industrial bio¬production: From bio-functional design to applications. Biotechnology Advances. 2023;64:108125. https://doi.org/10.1016/j.biotechadv.2023.108125</mixed-citation>
     <mixed-citation xml:lang="en">Qiu Y, Lei P, Wang R, Sun L, Luo Z, et al. Kluyveromyces as promising yeast cell factories for industrial bio¬production: From bio-functional design to applications. Biotechnology Advances. 2023;64:108125. https://doi.org/10.1016/ j.biotechadv.2023.108125</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B33">
    <label>33.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Allende A, Alvarez-Ordonez A, Bolton D, Bover-Cid S, Chemaly M, et al. Update of the list of QPS-recommended biological agents intentionally added to food or feed as notified to EFSA 15: Suitability of taxonomic units notified to EFSA until September 2021. EFSA Journal. 2022;20(1):e07045.</mixed-citation>
     <mixed-citation xml:lang="en">Allende A, Alvarez-Ordonez A, Bolton D, Bover-Cid S, Chemaly M, et al. Update of the list of QPS-recommended biological agents intentionally added to food or feed as notified to EFSA 15: Suitability of taxonomic units notified to EFSA until September 2021. EFSA Journal. 2022;20(1):e07045.</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B34">
    <label>34.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Spohner SC, Schaum V, Quitmann H, Czermak P. Kluyveromyces lactis: An emerging tool in biotechnology. Journal of Biotechnology. 2016;222:104-116. https://doi.org/10.1016/j.jbiotec.2016.02.023</mixed-citation>
     <mixed-citation xml:lang="en">Spohner SC, Schaum V, Quitmann H, Czermak P. Kluyveromyces lactis: An emerging tool in biotechnology. Journal of Biotechnology. 2016;222:104-116. https://doi.org/10.1016/j.jbiotec.2016.02.023</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B35">
    <label>35.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Reina-Posso D, Gonzales-Zubiate FA. Expanding horizons: The untapped potential of Kluyveromyces marxianus in biotechnological applications. Fermentation. 2025;11(2):98. https://doi.org/10.3390/fermentation11020098</mixed-citation>
     <mixed-citation xml:lang="en">Reina-Posso D, Gonzales-Zubiate FA. Expanding horizons: The untapped potential of Kluyveromyces marxianus in biotechnological applications. Fermentation. 2025;11(2):98. https://doi.org/10.3390/fermentation11020098</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B36">
    <label>36.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Pereira-Rodriguez A, Fernandez-Leiro R, Gonzalez-Siso MI, Cerdan ME, Becerra M, et al. Structural basis of specificity in tetrameric Kluyveromyces lactis β-galactosidase. Journal of Structural Biology. 2012;177(2):392-401. https://doi.org/10.1016/j.jsb.2011.11.031</mixed-citation>
     <mixed-citation xml:lang="en">Pereira-Rodriguez A, Fernandez-Leiro R, Gonzalez-Siso MI, Cerdan ME, Becerra M, et al. Structural basis of specificity in tetrameric Kluyveromyces lactis β-galactosidase. Journal of Structural Biology. 2012;177(2):392-401. https:// doi.org/10.1016/j.jsb.2011.11.031</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B37">
    <label>37.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">P00723 (BGAL_KLULA). SWISS-MODEL. [cited 2025 Apr 21]. (In Russ.) Available from: https://swissmodel.expasy.org/repository/uniprot/P00723?template=3ob8</mixed-citation>
     <mixed-citation xml:lang="en">P00723 (BGAL_KLULA). SWISS-MODEL. [cited 2025 Apr 21]. (In Russ.) Available from: https://swissmodel. expasy.org/repository/uniprot/P00723?template=3ob8</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B38">
    <label>38.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">O’Connell S, Walsh G. Purification and properties of a β-galactosidase with potential application as a digestive supplement. Applied Biochemistry and Biotechnology. 2007;141:1-14. https://doi.org/10.1007/s12010-007-9206-4</mixed-citation>
     <mixed-citation xml:lang="en">O’Connell S, Walsh G. Purification and properties of a β-galactosidase with potential application as a digestive supplement. Applied Biochemistry and Biotechnology. 2007;141:1-14. https://doi.org/10.1007/s12010-007-9206-4</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B39">
    <label>39.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Yin H, Bultema JB, Dijkhuizen L, van Leeuwen SS. Reaction kinetics and galactooligosaccharide product profiles of the в-galactosidases from Bacillus circulans, Kluyveromyces lactis and Aspergillus oryzae. Food Chemistry. 2017;225:230-238. https://doi.org/10.1016/j.foodchem.2017.01.030</mixed-citation>
     <mixed-citation xml:lang="en">Yin H, Bultema JB, Dijkhuizen L, van Leeuwen SS. Reaction kinetics and galactooligosaccharide product profiles of the β-galactosidases from Bacillus circulans, Kluyveromyces lactis and Aspergillus oryzae. Food Chemistry. 2017;225:230-238. https://doi.org/10.1016/j.foodchem.2017.01.030</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B40">
    <label>40.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Gonzalez-Delgado I, Lopez-Munoz M-J, Morales G, Segura Y. Optimisation of the synthesis of high galacto-oligo-saccharides (GOS) from lactose with β-galactosidase from Kluyveromyces lactis. International Dairy Journal. 2016;61:211-219. https://doi.org/10.1016/j.idairyj.2016.06.007</mixed-citation>
     <mixed-citation xml:lang="en">Gonzalez-Delgado I, Lopez-Munoz M-J, Morales G, Segura Y. Optimisation of the synthesis of high galacto-oligo-saccharides (GOS) from lactose with β-galactosidase from Kluyveromyces lactis. International Dairy Journal. 2016;61:211-219. https://doi.org/10.1016/j.idairyj.2016.06.007</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B41">
    <label>41.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Rico-Rodriguez F, Noriega MA, Lancheros R, Serrato-Bermudez JC. Kinetics of galactooligosaccharide (GOS) production with two β-galactosidases combined: Mathematical model and raw material effects. International Dairy Journal. 2021;118:105015. https://doi.org/10.1016/j.idairyj.2021.105015</mixed-citation>
     <mixed-citation xml:lang="en">Rico-Rodriguez F, Noriega MA, Lancheros R, Serrato-Bermudez JC. Kinetics of galactooligosaccharide (GOS) production with two β-galactosidases combined: Mathematical model and raw material effects. International Dairy Journal. 2021;118:105015. https://doi.org/10.1016/j.idairyj.2021.105015</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B42">
    <label>42.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Fischer C, Kleinschmidt T. Synthesis of galactooligosaccharides using sweet and acid whey as a substrate. International Dairy Journal. 2015;48:15-22. https://doi.org/10.1016/j.idairyj.2015.01.003</mixed-citation>
     <mixed-citation xml:lang="en">Fischer C, Kleinschmidt T. Synthesis of galactooligosaccharides using sweet and acid whey as a substrate. International Dairy Journal. 2015;48:15-22. https://doi.org/10.1016/j.idairyj.2015.01.003</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B43">
    <label>43.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Frenzel M, Zerge K, Clawin-Radecker I, Lorenzen PC. Comparison of the galacto-oligosaccharide forming activity of different β-galactosidases. LWT - Food Science and Technology. 2015;60(2, Part 1):1068-1071. https://doi.org/10.1016/j.lwt.2014.10.064</mixed-citation>
     <mixed-citation xml:lang="en">Frenzel M, Zerge K, Clawin-Radecker I, Lorenzen PC. Comparison of the galacto-oligosaccharide forming activity of different β-galactosidases. LWT - Food Science and Technology. 2015;60(2, Part 1):1068-1071. https://doi.org/10.1016/j.lwt.2014.10.064</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B44">
    <label>44.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Botvynko A, Bednarova A, Henke S, Shakhno N, Curda L. Production of galactooligosaccharides using various combinations of the commercial β-galactosidases. Biochemical and Biophysical Research Communications. 2019;517(4):762-766. https://doi.org/10.1016/j.bbrc.2019.08.001</mixed-citation>
     <mixed-citation xml:lang="en">Botvynko A, Bednarova A, Henke S, Shakhno N, Curda L. Production of galactooligosaccharides using various combinations of the commercial β-galactosidases. Biochemical and Biophysical Research Communications. 2019;517(4):762-766. https://doi.org/10.1016/j.bbrc.2019.08.001</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B45">
    <label>45.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Singh P, Arora S, Rao PS, Kathuria D, Sharma V, et al. Effect of process parameters on the β-galactosidase hydrolysis of lactose and galactooligosaccharide formation in concentrated skim milk. Food Chemistry. 2022;393:133355. https://doi.org/10.1016/j.foodchem.2022.133355</mixed-citation>
     <mixed-citation xml:lang="en">Singh P, Arora S, Rao PS, Kathuria D, Sharma V, et al. Effect of process parameters on the β-galactosidase hydrolysis of lactose and galactooligosaccharide formation in concentrated skim milk. Food Chemistry. 2022;393:133355. https://doi.org/10.1016/j.foodchem.2022.133355</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B46">
    <label>46.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Mano MCR, Paulino BN, Pastore GM. Whey permeate as the raw material in galacto-oligosaccharide synthesis using commercial enzymes. Food Research International. 2019;124:78-85. https://doi.org/10.1016/j.foodres.2018.09.019</mixed-citation>
     <mixed-citation xml:lang="en">Mano MCR, Paulino BN, Pastore GM. Whey permeate as the raw material in galacto-oligosaccharide synthesis using commercial enzymes. Food Research International. 2019;124:78-85. https://doi.org/10.1016/j.foodres.2018.09.019</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B47">
    <label>47.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Padilla B, Ruiz-Matute AI, Belloch C, Cardelle-Cobas A, Corzo N, et al. Evaluation of oligosaccharide synthesis from lactose and lactulose using β-galactosidases from Kluyveromyces isolated from artisanal cheeses. Journal of Agricultural and Food Chemistry. 2012;60(20):5134-5141. https://doi.org/10.1021/jf300852s</mixed-citation>
     <mixed-citation xml:lang="en">Padilla B, Ruiz-Matute AI, Belloch C, Cardelle-Cobas A, Corzo N, et al. Evaluation of oligosaccharide synthesis from lactose and lactulose using β-galactosidases from Kluyveromyces isolated from artisanal cheeses. Journal of Agricultural and Food Chemistry. 2012;60(20):5134-5141. https://doi.org/10.1021/jf300852s</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B48">
    <label>48.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Petrova VY, Kujumdzieva AV. Thermotolerant yeast strains producers of galacto-oligosaccharides. Biotechnology &amp; Biotechnological Equipment. 2010;24(1):1612-1619. https://doi.org/10.2478/V10133-010-0014-6</mixed-citation>
     <mixed-citation xml:lang="en">Petrova VY, Kujumdzieva AV. Thermotolerant yeast strains producers of galacto-oligosaccharides. Biotechnology &amp; Biotechnological Equipment. 2010;24(1):1612-1619. https://doi.org/10.2478/V10133-010-0014-6</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B49">
    <label>49.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Srivastava A, Mishra S, Chand S. Synthesis of galacto-oligosaccharides from lactose using immobilized cells of Kluyveromyces marxianus NCIM 3551. Journal of Molecular Catalysis B: Enzymatic. 2016;123:147-153. https://doi.org/10.1016/j.molcatb.2015.11.017</mixed-citation>
     <mixed-citation xml:lang="en">Srivastava A, Mishra S, Chand S. Synthesis of galacto-oligosaccharides from lactose using immobilized cells of Kluyveromyces marxianus NCIM 3551. Journal of Molecular Catalysis B: Enzymatic. 2016;123:147-153. https://doi.org/10.1016/j.molcatb.2015.11.017</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B50">
    <label>50.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Srivastava A, Rastogi A, Jaswal AS, Sahu JK, Agarwal GP, et al. Nanofiltration-based purification process for whole-cell transformed prebiotic galactooligosaccharides. Bioprocess and Biosystems Engineering. 2025;48:621-631. https://doi.org/10.1007/s00449-025-03132-6</mixed-citation>
     <mixed-citation xml:lang="en">Srivastava A, Rastogi A, Jaswal AS, Sahu JK, Agarwal GP, et al. Nanofiltration-based purification process for whole-cell transformed prebiotic galactooligosaccharides. Bioprocess and Biosystems Engineering. 2025;48:621-631. https://doi.org/10.1007/s00449-025-03132-6</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B51">
    <label>51.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Srivastava A, Mishra S, Chand S. Transgalactosylation of lactose for synthesis of galacto-oligosaccharides using Kluyveromyces marxianus NCIM 3551. New Biotechnology. 2015;32(4):412-418. https://doi.org/10.1016/j.nbt.2015.04.004</mixed-citation>
     <mixed-citation xml:lang="en">Srivastava A, Mishra S, Chand S. Transgalactosylation of lactose for synthesis of galacto-oligosaccharides using Kluyveromyces marxianus NCIM 3551. New Biotechnology. 2015;32(4):412-418. https://doi.org/10.1016/j.nbt.2015.04.004</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B52">
    <label>52.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Botvynko A, Synytsya A, Curda L. Synthesis of galactooligosaccharides with four β-galactosidases: Structural comparison of the products by HPLC, ESI-MS and NMR. Biochemical and Biophysical Research Communications. 2025;744:151204. https://doi.org/10.1016/j.bbrc.2024.151204</mixed-citation>
     <mixed-citation xml:lang="en">Botvynko A, Synytsya A, Curda L. Synthesis of galactooligosaccharides with four β-galactosidases: Structural comparison of the products by HPLC, ESI-MS and NMR. Biochemical and Biophysical Research Communications. 2025;744:151204. https://doi.org/10.1016/j.bbrc.2024.151204</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B53">
    <label>53.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Rodriguez-Colinas B, de Abreu MA, Fernandez-Arrojo L, de Beer R, Poveda A, et al. Production of galacto-oligosaccharides by the β-galactosidase from Kluyveromyces lactis: Comparative analysis of permeabilized cells versus soluble enzyme. Journal of Agricultural and Food Chemistry. 2011;59(19):10477-10484. https://doi.org/10.1021/jf2022012</mixed-citation>
     <mixed-citation xml:lang="en">Rodriguez-Colinas B, de Abreu MA, Fernandez-Arrojo L, de Beer R, Poveda A, et al. Production of galacto-oligosaccharides by the β-galactosidase from Kluyveromyces lactis: Comparative analysis of permeabilized cells versus soluble enzyme. Journal of Agricultural and Food Chemistry. 2011;59(19):10477-10484. https://doi.org/10.1021/jf2022012</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B54">
    <label>54.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">van Trijp MPH, Rios-Morales M, Logtenberg MJ, Keshtkar S, Afman LA, et al. Detailed analysis of prebiotic fructo- and galacto-oligosaccharides in the human small intestine. Journal of Agricultural and Food Chemistry. 2024;72(38):21152-21165. https://doi.org/10.1021/acs.jafc.4c03881</mixed-citation>
     <mixed-citation xml:lang="en">van Trijp MPH, Rios-Morales M, Logtenberg MJ, Keshtkar S, Afman LA, et al. Detailed analysis of prebiotic fructo- and galacto-oligosaccharides in the human small intestine. Journal of Agricultural and Food Chemistry. 2024;72(38):21152-21165. https://doi.org/10.1021/acs.jafc.4c03881</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B55">
    <label>55.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Ferreira-Lazarte A, Gallego-Lobillo P, Moreno FJ, Villamiel M, Hernandez-Hernandez O. In vitro digestibility of galactooligosaccharides: Effect of the structural features on their intestinal degradation. Journal of Agricultural and Food Chemistry. 2019;67(16):4662-4670. https://doi.org/10.1021/acs.jafc.9b00417</mixed-citation>
     <mixed-citation xml:lang="en">Ferreira-Lazarte A, Gallego-Lobillo P, Moreno FJ, Villamiel M, Hernandez-Hernandez O. In vitro digestibility of galactooligosaccharides: Effect of the structural features on their intestinal degradation. Journal of Agricultural and Food Chemistry. 2019;67(16):4662-4670. https://doi.org/10.1021/acs.jafc.9b00417</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B56">
    <label>56.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Akbari P, Fink-Gremmels J, Willems RHAM, Difilippo E, Schols HA, et al. Characterizing microbiota-independent effects of oligosaccharides on intestinal epithelial cells: Insight into the role of structure and size. European Journal of Nutrition. 2017;56(5):1919-1930. https://doi.org/10.1007/s00394-016-1234-9</mixed-citation>
     <mixed-citation xml:lang="en">Akbari P, Fink-Gremmels J, Willems RHAM, Difilippo E, Schols HA, et al. Characterizing microbiota-independent effects of oligosaccharides on intestinal epithelial cells: Insight into the role of structure and size. European Journal of Nutrition. 2017;56(5):1919-1930. https://doi.org/10.1007/s00394-016-1234-9</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B57">
    <label>57.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Figueroa-Lozano S, Ren C, Yin H, Pham H, van Leeuwen S, et al. The impact of oligosaccharide content, glycosidic linkages and lactose content of galacto-oligosaccharides (GOS) on the expression of mucus-related genes in goblet cells. Food &amp; Function. 2020;11(4):3506-3515. https://doi.org/10.1039/d0fo00064g</mixed-citation>
     <mixed-citation xml:lang="en">Figueroa-Lozano S, Ren C, Yin H, Pham H, van Leeuwen S, et al. The impact of oligosaccharide content, glycosidic linkages and lactose content of galacto-oligosaccharides (GOS) on the expression of mucus-related genes in goblet cells. Food &amp; Function. 2020;11(4):3506-3515. https://doi.org/10.1039/d0fo00064g</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B58">
    <label>58.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Teymennet-Ramnez KV, Martinez-Morales F, Trejo-Hernandez MR. Yeast surface display system: Strategies for improvement and biotechnological applications. Frontiers in Bioengineering and Biotechnology. 2022;9:794742. https://doi.org/10.3389/fbioe.2021.794742</mixed-citation>
     <mixed-citation xml:lang="en">Teymennet-Ramnez KV, Martinez-Morales F, Trejo-Hernandez MR. Yeast surface display system: Strategies for improvement and biotechnological applications. Frontiers in Bioengineering and Biotechnology. 2022;9:794742. https://doi.org/10.3389/fbioe.2021.794742</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B59">
    <label>59.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Sun H, You S, Wang M, Qi W, Su R, et al. Recyclable strategy for the production of high-purity galacto-oligosaccharides by Kluyveromyces lactis. Journal of Agricultural and Food Chemistry. 2016;64(28):5679-5685. https://doi.org/10.1021/acs.jafc.6b01531</mixed-citation>
     <mixed-citation xml:lang="en">Sun H, You S, Wang M, Qi W, Su R, et al. Recyclable strategy for the production of high-purity galacto-oligosaccharides by Kluyveromyces lactis. Journal of Agricultural and Food Chemistry. 2016;64(28):5679-5685. https://doi.org/10.1021/acs.jafc.6b01531</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B60">
    <label>60.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Gonzalez-Catano F, Tovar-Castro L, Castano-Tostado E, Regalado-Gonzalez C, Garcia-Almendarez B, et al. Im¬provement of covalent immobilization procedure of β-galactosidase from Kluyveromyces lactis for galactooligosaccharides production: Modeling and kinetic study. Biotechnology Progress. 2017;33(6):1568-1578. https://doi.org/10.1002/btpr.2509</mixed-citation>
     <mixed-citation xml:lang="en">Gonzalez-Catano F, Tovar-Castro L, Castano-Tostado E, Regalado-Gonzalez C, Garcia-Almendarez B, et al. Im¬provement of covalent immobilization procedure of β-galactosidase from Kluyveromyces lactis for galactooligosaccharides production: Modeling and kinetic study. Biotechnology Progress. 2017;33(6):1568-1578. https://doi.org/10.1002/btpr.2509</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B61">
    <label>61.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Misson M, Dai S, Jin B, Chen BH, Zhang H. Manipulation of nanofiber-based β-galactosidase nanoenvironment for enhancement of galacto-oligosaccharide production. Journal of Biotechnology. 2016;222:56-64. https://doi.org/10.1016/j.jbiotec.2016.02.014</mixed-citation>
     <mixed-citation xml:lang="en">Misson M, Dai S, Jin B, Chen BH, Zhang H. Manipulation of nanofiber-based β-galactosidase nanoenvironment for enhancement of galacto-oligosaccharide production. Journal of Biotechnology. 2016;222:56-64. https://doi.org/10.1016/j.jbiotec.2016.02.014</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B62">
    <label>62.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Misson M, Jin B, Dai S, Zhang H. Interfacial biocatalytic performance of nanofiber-supported β-galactosidase for production of galacto-oligosaccharides. Catalysts. 2020;10(1):81. https://doi.org/10.3390/catal10010081</mixed-citation>
     <mixed-citation xml:lang="en">Misson M, Jin B, Dai S, Zhang H. Interfacial biocatalytic performance of nanofiber-supported β-galactosidase for production of galacto-oligosaccharides. Catalysts. 2020;10(1):81. https://doi.org/10.3390/catal10010081</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B63">
    <label>63.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Majore K, Ciprovica I. Bioconversion of lactose into glucose-galactose syrup by two-stage enzymatic hydrolysis. Foods. 2022;11(3):400. https://doi.org/10.3390/foods11030400</mixed-citation>
     <mixed-citation xml:lang="en">Majore K, Ciprovica I. Bioconversion of lactose into glucose-galactose syrup by two-stage enzymatic hydrolysis. Foods. 2022;11(3):400. https://doi.org/10.3390/foods11030400</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B64">
    <label>64.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Bolognesi LS, Gabardo S, Dall Cortivo PR, Ayub MAZ. Biotechnological production of galactooligosaccharides (GOS) using porungo cheese whey. Food Science and Technology. 2022;42:e64520. https://doi.org/10.1590/fst.64520</mixed-citation>
     <mixed-citation xml:lang="en">Bolognesi LS, Gabardo S, Dall Cortivo PR, Ayub MAZ. Biotechnological production of galactooligosaccharides (GOS) using porungo cheese whey. Food Science and Technology. 2022;42:e64520. https://doi.org/10.1590/fst.64520</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B65">
    <label>65.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Chenafa A, Abdo AAA, Mahdi AA, Zhang Q, Chen C, et al. Functionalized electrospun nanofibers to enhance β-Galactosidase immobilization and catalytic activity for efficient galactooligosaccharide synthesis. International Journal of Biological Macromolecules. 2024;270:132312. https://doi.org/10.1016/j.ijbiomac.2024.132312</mixed-citation>
     <mixed-citation xml:lang="en">Chenafa A, Abdo AAA, Mahdi AA, Zhang Q, Chen C, et al. Functionalized electrospun nanofibers to enhance β-Galactosidase immobilization and catalytic activity for efficient galactooligosaccharide synthesis. International Journal of Biological Macromolecules. 2024;270:132312. https://doi.org/10.1016/j.ijbiomac.2024.132312</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B66">
    <label>66.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Xuan Z, Wang K, Duan F, Lu L. Non-carrier immobilization of yeast cells by genipin crosslinking for the synthesis of prebiotic galactooligosaccharides from plant-derived galactose. International Journal of Biological Macromolecules. 2024; 277(Part 1):133991. https://doi.org/10.1016/j.ijbiomac.2024.133991</mixed-citation>
     <mixed-citation xml:lang="en">Xuan Z, Wang K, Duan F, Lu L. Non-carrier immobilization of yeast cells by genipin crosslinking for the synthesis of prebiotic galactooligosaccharides from plant-derived galactose. International Journal of Biological Macromolecules. 2024; 277(Part 1):133991. https://doi.org/10.1016/j.ijbiomac.2024.133991</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B67">
    <label>67.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Ren H, Fei J, Shi X, Zhao T, Cheng H, et al. Continuous ultrafiltration membrane reactor coupled with nanofiltration for the enzymatic synthesis and purification of galactosyl-oligosaccharides. Separation and Purification Technology. 2015;144: 70-79. https://doi.org/10.1016/j.seppur.2015.02.020</mixed-citation>
     <mixed-citation xml:lang="en">Ren H, Fei J, Shi X, Zhao T, Cheng H, et al. Continuous ultrafiltration membrane reactor coupled with nanofiltration for the enzymatic synthesis and purification of galactosyl-oligosaccharides. Separation and Purification Technology. 2015;144: 70-79. https://doi.org/10.1016/j.seppur.2015.02.020</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B68">
    <label>68.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Рябцева С. А., Котова А. А., Скрипнюк А. А. Синтез галактоолигосахаридов с использованием дрожжей Kl. marxianus и термофильного стрептококка. Молочная промышленность. 2017. № 6. С. 62-64. https://elibrary.ru/YULXGF</mixed-citation>
     <mixed-citation xml:lang="en">Ryabtseva SA, Kotova AA, Skripnyuk AA. Synthesis of galactooligosaccharides using Kl. marxianus and streptococcus thermophilus. Dairy industry. 2017; (6):62-64. (In Russ.] https://elibrary.ru/YULXGF</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B69">
    <label>69.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Fischer C, Kleinschmidt T. Combination of two β-galactosidases during the synthesis of galactooligosaccharides may enhance yield and structural diversity. Biochemical and Biophysical Research Communications. 2018;506(1):211-215. https://doi.org/10.1016/j.bbrc.2018.10.091</mixed-citation>
     <mixed-citation xml:lang="en">Fischer C, Kleinschmidt T. Combination of two β-galactosidases during the synthesis of galactooligosaccharides may enhance yield and structural diversity. Biochemical and Biophysical Research Communications. 2018;506(1):211-215. https://doi.org/10.1016/j.bbrc.2018.10.091</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B70">
    <label>70.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Fischer C, Kleinschmidt T. Effect of glucose depletion during the synthesis of galactooligosaccharides using a trienzymatic system. Enzyme and Microbial Technology. 2019;121:45-50. https://doi.org/10.1016/j.enzmictec.2018.10.009</mixed-citation>
     <mixed-citation xml:lang="en">Fischer C, Kleinschmidt T. Effect of glucose depletion during the synthesis of galactooligosaccharides using a trienzymatic system. Enzyme and Microbial Technology. 2019;121:45-50. https://doi.org/10.1016/j.enzmictec.2018.10.009</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B71">
    <label>71.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Rico-Rodriguez F, Serrato JC, Montilla A, Villamiel M. Impact of ultrasound on galactooligosaccharides and gluconic acid production throughout a multienzymatic system. Ultrasonics Sonochemistry. 2018;44:177-183. https://doi.org/10.1016/j.ultsonch.2018.02.022</mixed-citation>
     <mixed-citation xml:lang="en">Rico-Rodriguez F, Serrato JC, Montilla A, Villamiel M. Impact of ultrasound on galactooligosaccharides and gluconic acid production throughout a multienzymatic system. Ultrasonics Sonochemistry. 2018;44:177-183. https://doi.org/10.1016/ j.ultsonch.2018.02.022</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B72">
    <label>72.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Ponnusamy V, Sankaranarayanan M. Targeted gene manipulation of Leloir pathway genes for the constitutive expression of β-galactosidase and its transgalactosylation product galacto-oligosaccharides from Kluyveromyces lactis GG799 and knockout strains. Enzyme and Microbial Technology. 2023;169:110263. https://doi.org/10.1016/j.enzmictec.2023.110263</mixed-citation>
     <mixed-citation xml:lang="en">Ponnusamy V, Sankaranarayanan M. Targeted gene manipulation of Leloir pathway genes for the constitutive expression of β-galactosidase and its transgalactosylation product galacto-oligosaccharides from Kluyveromyces lactis GG799 and knockout strains. Enzyme and Microbial Technology. 2023;169:110263. https://doi.org/10.1016/j.enzmictec.2023.110263</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B73">
    <label>73.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Kaczynski LK, Cais-Sokolinska D, Szwengiel A. Kinetics of lactose hydrolysis and galactooligosaccharides formation in beverages based on goat’s milk and its permeate. Food Science and Biotechnology. 2019;28(5):1529-1534. https://doi.org/10.1007/s10068-019-00600-0</mixed-citation>
     <mixed-citation xml:lang="en">Kaczynski LK, Cais-Sokolinska D, Szwengiel A. Kinetics of lactose hydrolysis and galactooligosaccharides formation in beverages based on goat’s milk and its permeate. Food Science and Biotechnology. 2019;28(5):1529-1534. https://doi.org/10.1007/s10068-019-00600-0</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B74">
    <label>74.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Limnaios A, Tsevdou M, Tsika E, Korialou N, Zerva A, et al. Production of prebiotic galacto-oligosaccharides from acid whey catalyzed by a novel β-galactosidase from Thermothielavioides terrestris and commercial lactases: A comparative study. Catalysts. 2023;13(10):1360. https://doi.org/10.3390/catal13101360</mixed-citation>
     <mixed-citation xml:lang="en">Limnaios A, Tsevdou M, Tsika E, Korialou N, Zerva A, et al. Production of prebiotic galacto-oligosaccharides from acid whey catalyzed by a novel β-galactosidase from Thermothielavioides terrestris and commercial lactases: A comparative study. Catalysts. 2023;13(10):1360. https://doi.org/10.3390/catal13101360</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B75">
    <label>75.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Limnaios A, Tsevdou M, Zafeiri E, Topakas E, Taoukis P. Cheese and yogurt by-products as valuable ingredients for the production of prebiotic oligosaccharides. Dairy. 2024;5(1):78-92. https://doi.org/10.3390/dairy5010007</mixed-citation>
     <mixed-citation xml:lang="en">Limnaios A, Tsevdou M, Zafeiri E, Topakas E, Taoukis P. Cheese and yogurt by-products as valuable ingredients for the production of prebiotic oligosaccharides. Dairy. 2024;5(1):78-92. https://doi.org/10.3390/dairy5010007</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B76">
    <label>76.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Guron GKP, Hotchkiss ATJr, Bodnar BH, Harron A, Renye JAJr, et al. Oligosaccharide production using β-galactosidase from Lactobacillus bulgaricus and Kluyveromyces lactis in sweetened reconstituted nonfat dry milk. Journal of Dairy Science. 2025;108(6):5696-5704. https://doi.org/10.3168/jds.2025-26396</mixed-citation>
     <mixed-citation xml:lang="en">Guron GKP, Hotchkiss ATJr, Bodnar BH, Harron A, Renye JAJr, et al. Oligosaccharide production using β-galactosidase from Lactobacillus bulgaricus and Kluyveromyces lactis in sweetened reconstituted nonfat dry milk. Journal of Dairy Science. 2025;108(6):5696-5704. https://doi.org/10.3168/jds.2025-26396</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B77">
    <label>77.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Hoyos JD, Noriega MA, Riascos CAM. Modeling and simulation of the enzymatic kinetics for the production of Galactooligosaccharides (GOS) using an Artificial Neural Network hybrid model. Digital Chemical Engineering. 2023;9:100132. https://doi.org/10.1016/j.dche.2023.100132</mixed-citation>
     <mixed-citation xml:lang="en">Hoyos JD, Noriega MA, Riascos CAM. Modeling and simulation of the enzymatic kinetics for the production of Galactooligosaccharides (GOS) using an Artificial Neural Network hybrid model. Digital Chemical Engineering. 2023;9:100132. https://doi.org/10.1016/j.dche.2023.100132</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B78">
    <label>78.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Rico-Rodriguez F, Villamiel M, Ruiz-Aceituno L, Serrato JC, Montilla A. Effect of the lactose source on the ultrasound-assisted enzymatic production of galactooligosaccharides and gluconic acid. Ultrasonics Sonochemistry. 2020;67:104945. https://doi.org/10.1016/j.ultsonch.2019.104945</mixed-citation>
     <mixed-citation xml:lang="en">Rico-Rodriguez F, Villamiel M, Ruiz-Aceituno L, Serrato JC, Montilla A. Effect of the lactose source on the ultrasound-assisted enzymatic production of galactooligosaccharides and gluconic acid. Ultrasonics Sonochemistry. 2020;67:104945. https://doi.org/10.1016/j.ultsonch.2019.104945</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B79">
    <label>79.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Cordova A, Astudillo-Castro C, Henriquez P, Manriquez N, Nunez H, et al. Ultrasound-assisted enzymatic synthesis of galacto-oligosaccharides using native whey with two commercial β-galactosidases: Aspergillus oryzae and Kluyveromyces var lactis. Food Chemistry. 2023;426:136526. https://doi.org/10.1016/j.foodchem.2023.136526</mixed-citation>
     <mixed-citation xml:lang="en">Cordova A, Astudillo-Castro C, Henriquez P, Manriquez N, Nunez H, et al. Ultrasound-assisted enzymatic synthesis of galacto-oligosaccharides using native whey with two commercial β-galactosidases: Aspergillus oryzae and Kluyveromyces var lactis. Food Chemistry. 2023;426:136526. https://doi.org/10.1016/j.foodchem.2023.136526</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B80">
    <label>80.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Jarrard TR, Brock E, Hansen LD, Kenealey JD. Measuring β-galactosidase activity in opaque dairy solutions under optimum conditions for galactooligosaccharide synthesis by isothermal titration calorimetry. Journal of Dairy Science. 2023; 106(12):8312-8320. https://doi.org/10.3168/jds.2023-23400</mixed-citation>
     <mixed-citation xml:lang="en">Jarrard TR, Brock E, Hansen LD, Kenealey JD. Measuring β-galactosidase activity in opaque dairy solutions under optimum conditions for galactooligosaccharide synthesis by isothermal titration calorimetry. Journal of Dairy Science. 2023; 106(12):8312-8320. https://doi.org/10.3168/jds.2023-23400</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B81">
    <label>81.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Yeo I-S, Yoon Y-J, Seo N, An HJ, Kim J-H. Biopurification of oligosaccharides by immobilized Kluyveromyces lactis. Applied Sciences. 2019;9(14):2845. https://doi.org/10.3390/app9142845</mixed-citation>
     <mixed-citation xml:lang="en">Yeo I-S, Yoon Y-J, Seo N, An HJ, Kim J-H. Biopurification of oligosaccharides by immobilized Kluyveromyces lactis. Applied Sciences. 2019;9(14):2845. https://doi.org/10.3390/app9142845</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B82">
    <label>82.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Tokosova S, Hronska H, Rosenberg M. Production of high-content galacto-oligosaccharides mixture using β-galactosidase and Kluyveromyces marxianus entrapped in polyvinylalcohol gel. Chemical Papers. 2016;70:1445-1451. https://doi.org/10.1515/chempap-2016-0081</mixed-citation>
     <mixed-citation xml:lang="en">Tokosova S, Hronska H, Rosenberg M. Production of high-content galacto-oligosaccharides mixture using β-galactosidase and Kluyveromyces marxianus entrapped in polyvinylalcohol gel. Chemical Papers. 2016;70:1445-1451. https://doi.org/10.1515/chempap-2016-0081</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B83">
    <label>83.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Santibanez L, Guerrero C, Illanes A. Raw galacto-oligosaccharide purification by consecutive lactose hydrolysis and selective bioconversion. International Dairy Journal. 2017;75:91-100. https://doi.org/10.1016/j.idairyj.2017.07.008</mixed-citation>
     <mixed-citation xml:lang="en">Santibanez L, Guerrero C, Illanes A. Raw galacto-oligosaccharide purification by consecutive lactose hydrolysis and selective bioconversion. International Dairy Journal. 2017;75:91-100. https://doi.org/10.1016/j.idairyj.2017.07.008</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B84">
    <label>84.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Guerrero C, Vera C, Illanes A. Selective bioconversion with yeast for the purifcation of raw lactulose and trans-galactosylated oligosaccharides. International Dairy Journal. 2018;81:131-137. https://doi.org/10.1016/j.idairyj.2018.02.003</mixed-citation>
     <mixed-citation xml:lang="en">Guerrero C, Vera C, Illanes A. Selective bioconversion with yeast for the purifcation of raw lactulose and trans-galactosylated oligosaccharides. International Dairy Journal. 2018;81:131-137. https://doi.org/10.1016/j.idairyj.2018.02.003</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B85">
    <label>85.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Srivastava A, Mishra S. Enrichment and evaluation of galactooligosaccharides produced by whole cell treatment of sugar reaction mixture. Molecular Biology Reports. 2019;46:1181-1188. https://doi.org/10.1007/s11033-019-04585-1</mixed-citation>
     <mixed-citation xml:lang="en">Srivastava A, Mishra S. Enrichment and evaluation of galactooligosaccharides produced by whole cell treatment of sugar reaction mixture. Molecular Biology Reports. 2019;46:1181-1188. https://doi.org/10.1007/s11033-019-04585-1</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B86">
    <label>86.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Pazmandi M, Kovacs Z, Balga E, Kovacs M, Maraz A. Production of high-purity galacto-oligosaccharides by depleting glucose and lactose from galacto-oligosaccharide syrup with yeasts. Yeast. 2020;37(9-10):515-530. https://doi.org/10.1002/yea.3507</mixed-citation>
     <mixed-citation xml:lang="en">Pazmandi M, Kovacs Z, Balga E, Kovacs M, Maraz A. Production of high-purity galacto-oligosaccharides by depleting glucose and lactose from galacto-oligosaccharide syrup with yeasts. Yeast. 2020;37(9-10):515-530. https://doi.org/10.1002/yea.3507</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B87">
    <label>87.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Zhang X, Yao C, Wang T, Zhao H, Zhang B. Production of high-purity galacto-oligosaccharides (GOS) by Lacto-bacillus-derived в-galactosidase. European Food Research and Technology. 2021;247:1501-1510. https://doi.org/10.1007/s00217-021-03727-9</mixed-citation>
     <mixed-citation xml:lang="en">Zhang X, Yao C, Wang T, Zhao H, Zhang B. Production of high-purity galacto-oligosaccharides (GOS) by Lacto-bacillus-derived β-galactosidase. European Food Research and Technology. 2021;247:1501-1510. https://doi.org/10.1007/s00217-021-03727-9</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B88">
    <label>88.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Li Z, Tian-Tian L, Aziz T, Min Z, Sarwar A, et al. Purification of galacto-oligosaccharide (GOS) by fermentation with Kluyveromyces lactis and interaction between GOS and casein under simulated acidic fermentation conditions. World Journal of Microbiology and Biotechnology. 2023;39(12):342. https://doi.org/10.1007/s11274-023-03791-1</mixed-citation>
     <mixed-citation xml:lang="en">Li Z, Tian-Tian L, Aziz T, Min Z, Sarwar A, et al. Purification of galacto-oligosaccharide (GOS) by fermentation with Kluyveromyces lactis and interaction between GOS and casein under simulated acidic fermentation conditions. World Journal of Microbiology and Biotechnology. 2023;39(12):342. https://doi.org/10.1007/s11274-023-03791-1</mixed-citation>
    </citation-alternatives>
   </ref>
   <ref id="B89">
    <label>89.</label>
    <citation-alternatives>
     <mixed-citation xml:lang="ru">Cao L, Bultsma M, Wissing J, Gerhard BE, Ziegler M, et al. High purity galacto-oligosaccharides: Optimal process design and prebiotic effect. Bioactive Carbohydrates and Dietary Fibre. 2023;30:100387. https://doi.org/10.1016/j.bcdf.2023.100387</mixed-citation>
     <mixed-citation xml:lang="en">Cao L, Bultsma M, Wissing J, Gerhard BE, Ziegler M, et al. High purity galacto-oligosaccharides: Optimal process design and prebiotic effect. Bioactive Carbohydrates and Dietary Fibre. 2023;30:100387. https://doi.org/10.1016/j.bcdf.2023.100387</mixed-citation>
    </citation-alternatives>
   </ref>
  </ref-list>
 </back>
</article>
