Food Processing: Techniques and Technology Food Processing: Techniques and Technology Техника и технология пищевых производств 2074-9414 2313-1748 73066 10.21603/2074-9414-2023-4-2482 ОРИГИНАЛЬНАЯ СТАТЬЯ ORIGINAL ARTICLE ОРИГИНАЛЬНАЯ СТАТЬЯ Electrochemical Sensors Based on Single-Wall Carbon Nanotubes in Voltammetric Ascorbic Acid Tests Электрохимические сенсоры на основе сеток из однослойных углеродных нанотрубок для вольтамперометрического определения аскорбиновой кислоты https://orcid.org/0000-0002-6206-3504 Иванова Наталия В. Ivanova Natalia V. Мартынова Елизавета А. Martynova Elizaveta A. https://orcid.org/0000-0001-6561-0924 Вершинина Анна И. Vershinina Anna I. https://orcid.org/0000-0001-6544-3687 Ломакин Максим В. Lomakin Maksim V. https://orcid.org/0000-0003-0188-0065 Еремеева Галина О. Eremeeva Galina O. https://orcid.org/0000-0002-9293-9271 Гордая Олеся Р. Gordaya Olesya R. https://orcid.org/0000-0001-7902-1178 Шандаков Сергей Д. Shandakov Sergey D. sergey.shandakov@gmail.com Кемеровский государственный университет Кемерово Россия Kemerovo State University Kemerovo Russian Federation Кемеровский государственный университет Кемерово Россия Kemerovo State University Kemerovo Russian Federation Кемеровский государственный университет Кемерово Россия Kemerovo State University Kemerovo Russian Federation Кемеровский государственный университет Кемерово Россия Kemerovo State University Kemerovo Russian Federation Кемеровский государственный университет Кемерово Россия Kemerovo State University Kemerovo Russian Federation Кемеровский государственный университет Кемерово Россия Kemerovo State University Kemerovo Russian Federation Кемеровский государственный университет Кемерово Россия Kemerovo State University Kemerovo Russian Federation 30 12 2023 30 12 2023 53 4 824 831 11 10 2023 05 12 2023 https://fptt.ru/en/issues/22269/22261/

Создание высокочувствительных и селективных сенсорных систем для определения биологически активных веществ является одним из важнейших направлений развития современной аналитической химии. В работе представлены результаты исследования электрохимических свойств новых волоконных материалов на основе сеток из однослойных углеродных нанотрубок, предназначенных для изготовления сенсоров для определения содержания аскорбиновой кислоты методом вольтамперометрии. Разработана технология синтеза сеток из разупорядоченных однослойных углеродных нанотрубок методом химического осаждения из газовой фазы и изготовления волокон методом мокрого вытягивания сеток однослойных углеродных нанотрубок из растворителя. Оптимизирована методика подготовки сеток и волокон, сочетающая отжиг на воздухе и обработку сильными неорганическими кислотами. Экспериментально выбраны условия регистрации вольтамперных кривых (фоновый электролит, скорость развертки, условия предварительного кондиционирования) для получения максимального отклика сенсора на содержание аскорбиновой кислоты. Ток и площадь пика окисления аскорбиновой кислоты не зависят от времени и потенциала кондиционирования сенсора. Линейные зависимости этих параметров от концентрации аскорбиновой кислоты в фосфатном буферном электролите наблюдаются в диапазоне 50–500 μмоль/л (8,8–90 мг/л) при скорости сканирования 0,1 мВ/с. Чувствительность миниатюрного волоконного сенсора из сеток однослойных углеродных нанотрубок длиной 0,5 см и средней шириной 400 мкм в два раза выше чувствительности дискового стеклоуглеродного электрода диаметром 5 мм. Достигнутые показатели позволяют использовать сенсоры для определения аскорбиновой кислоты в пищевых продуктах, фармацевтических препаратах и биологических жидкостях

Modern highly sensitive and selective sensors are able to determine biologically active substances, which makes this direction one of the most popular areas of analytical chemistry. The study featured the electrochemical properties of new fiber materials based on single-wall carbon nanotubes with prospects of using them in the voltammetry of ascorbic acid. The authors developed a new technology to synthesize films from disordered single-wall carbon nanotubes by chemical vapor deposition. Fibers were produced from a solvent by wet-pulling of single-wall carbon nanotubes networks. Thin films of randomly oriented single-wall carbon nanotube bundles were deposited downstream of a floating aerosol CVD reactor, which included a high temperature furnace with a quartz tube. The synthesis of the single-wall carbon nanotube samples was performed at 825°C. Ethanol served as carbon source while ferrocene was used as catalyst precursor. The single-wall carbon nanotubes were collected on a nitrocellulose filter in the form of films with transmittances of 10% in the middle of the visible wavelength (550 nm). The method was optimized to involve air annealing at 300–320°C and a treatment with strong inorganic acids, i.e., HCl, HNO3 + H2SO4. The voltammetric curves recording included background electrolyte, scan rate, and preconditioning. These parameters were selected experimentally to obtain the maximal sensor response to ascorbic acid content. The anodic peak of ascorbic acid in the phosphate buffer electrolyte (pH 6.86) was observed at a potential of +0.2 V. The current and peak area of ascorbic acid oxidation depended neither on the time nor on the conditioning potential of the sensor. The linear dependences of these parameters on the concentration of ascorbic acid stayed within 50–500 μmol/L (8.8–90 mg/L) at a scan rate of 0.1 mV/s. The single-wall carbon nanotube microsensor had a length of 0.5 cm and an average width of 400 μm. Its sensitivity was two times as high as that of a disk glassy carbon electrode with a diameter of 5 mm. The experimental sensors proved effective in determining ascorbic acid in food products, pharmaceuticals, and biological fluids.

 Углеродные нанотрубки сенсоры вольтамперометрия аскорбиновая кислота Carbon nanotubes sensors voltammetry ascorbic acid Работа поддержана Министерством науки и высшего образования Российской Федерации (Минобрнауки России) (проект № FZSR-2020-0007 в рамках государственного задания № 075-03-2020-097/1). The work was supported by the Ministry of Science and Higher Education of the Russian Federation (Minobrnauki) : project no. FZSR-2020-0007, state assignment no. 075-03-2020-097/1.

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