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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">vguit</journal-id><journal-title-group><journal-title xml:lang="ru">Вестник Воронежского государственного университета инженерных технологий</journal-title><trans-title-group xml:lang="en"><trans-title>Proceedings of the Voronezh State University of Engineering Technologies</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2226-910X</issn><issn pub-type="epub">2310-1202</issn><publisher><publisher-name>VSUET</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.20914/2310-1202-2018-3-104-110</article-id><article-id custom-type="elpub" pub-id-type="custom">vguit-1770</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>Пищевая  биотехнология</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Food biotechnology</subject></subj-group></article-categories><title-group><article-title>Сравнительное исследование антиоксидантной активности популярных марок чая из торговых сетей</article-title><trans-title-group xml:lang="en"><trans-title>Comparative study of the antioxidant activity of popular tea brands from trade market</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Валиулина</surname><given-names>Д. Ф.</given-names></name><name name-style="western" xml:lang="en"><surname>Valiulina</surname><given-names>D. F.</given-names></name></name-alternatives><bio xml:lang="ru"><p>к.т.н., доцент, кафедра , ул. Молодогвардейская 244, г. Самара, 443100, Россия</p></bio><bio xml:lang="en"><p>Cand. Sci. (Engin.), associate professor, department, Molodogvardiis'ka str., 224, Samara, 443100, Russia</p></bio><email xlink:type="simple">dinara-bakieva@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Макарова</surname><given-names>Н. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Makarova</surname><given-names>N. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>д.х.н., профессор, кафедра , ул. Молодогвардейская 244, г. Самара, 443100, Россия</p></bio><bio xml:lang="en"><p>Dr. Sci. (Engin.), professor, department, Molodogvardiis'ka str., 224, Samara, 443100, Russia</p></bio><email xlink:type="simple">makarovanv1969@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Самарский государственный технический университет</institution></aff><aff xml:lang="en"><institution>Samara State Technical university</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2018</year></pub-date><pub-date pub-type="epub"><day>18</day><month>06</month><year>2018</year></pub-date><volume>80</volume><issue>3</issue><fpage>104</fpage><lpage>110</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Валиулина Д.Ф., Макарова Н.В., 2018</copyright-statement><copyright-year>2018</copyright-year><copyright-holder xml:lang="ru">Валиулина Д.Ф., Макарова Н.В.</copyright-holder><copyright-holder xml:lang="en">Valiulina D.F., Makarova N.V.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.vestnik-vsuet.ru/vguit/article/view/1770">https://www.vestnik-vsuet.ru/vguit/article/view/1770</self-uri><abstract><p>Чай является традиционным напитком, содержащим антиоксиданты фенольной природы и другие фитонутриенты. В данном исследовании было проанализировано 17 видов чаев в пакетиках. Экстракцию фенольных веществ и флавоноидов проводили 50% этанолом, после чего определяли содержание фенольных веществ, флавоноидов, антирадикальную активность по методу DPPH, восстанавливающую способность по методу FRAP. Полученные результаты свидетельствуют о высоком потенциале определенных видов чая блокировать свободные радикалы в модельных экспериментах in vitro благодаря наличию фенольных веществ (1086–1277 мг галловой кислоты/100 г сырья). Наибольшей антирадикальной активностью среди изученных объектов отличаются чаи фирмы GreenField – 0,33 и 0,34 мг/мл (концентрация экстракта, необходимая для связывания 50% радикалов DPPH в растворе, - 1 мг/мл). По способности проявлять восстанавливающую способность в отношении ионов железа значимо отличается Черный Curtis и черный Цветущий Тимьян (21,96 и 19,44 ммоль Fe2+/1 кг сырья). Исследования антиоксидантной активности in vitro представленных объектов выявили группу объектов, содержащую фенольные вещества, флавоноиды, которые в модельных экспериментах in vitro обладают высокими противорадикальными, противоокислительными и восстанавливающими свойствами.</p></abstract><trans-abstract xml:lang="en"><p>Tea is a traditional drink containing antioxidants of phenolic nature and other phytonutrients. 17 kinds of tea in bags were analysed. Extraction of phenolic substances and flavonoids was carried out with 50% ethanol, after which the content of phenolic substances, flavonoids, antiradical activity by the DPPH method, restoring ability by the FRAP method were determined. The obtained results testify the high potential of certain types of tea to block free radicals in model experiments in vitro due to the presence of phenolic substances (1086–1277 mg of gallic acid / 100 g of raw material). The most anti-radical activity among the studied objects belongs to GreenField teas – 0.33 and 0.34 mg / ml (the concentration of extract required to bind 50% of the DPPH radicals in the solution is 1 mg / ml). The ability to express a reducing ability for iron ions significantly distinguishes Black Curtis and Black Blooming Thyme (21.96 and 19.44 mmol Fe2+ / 1 kg of raw material). Study of antioxidant activity in vitro of the presented objects revealed a group of objects containing phenolic substances, flavonoids, which in the model experiments in vitro possess high anti-radical, antioxidant and reducing properties.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>чай</kwd><kwd>фенольные вещества</kwd><kwd>флавоноиды</kwd><kwd>антикосидантная активность</kwd><kwd>окислительный стресс</kwd></kwd-group><kwd-group xml:lang="en"><kwd>tea</kwd><kwd>phenolic substances</kwd><kwd>flavonoids</kwd><kwd>antioxidant activity</kwd><kwd>oxidative stress</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Пакен П. Функциональные напитки и напитки специального назначения. СПб.: Профессия, 2010. 496 с.</mixed-citation><mixed-citation xml:lang="en">Paquin P. Functional and speciality beverage technology. 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