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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">vestib</journal-id><journal-title-group><journal-title xml:lang="ru">Известия Национальной  академии наук Беларуси. Серия биологических наук</journal-title><trans-title-group xml:lang="en"><trans-title>Proceedings of the National Academy of Sciences of Belarus, Biological Series</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1029-8940</issn><issn pub-type="epub">2524-230X</issn><publisher><publisher-name>The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.29235/1029-8940-2020-65-2-199-211</article-id><article-id custom-type="elpub" pub-id-type="custom">vestib-669</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>Статьи</subject></subj-group></article-categories><title-group><article-title>Фотосенсибилизированное рибофлавином окисление тиамина в водных растворах при воздействии ультрафиолета и видимого излучения</article-title><trans-title-group xml:lang="en"><trans-title>Riboflavin-photosensitized thiamine oxidation in aqueous solutions on exposure to ultraviolet and visible light</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>Степуро</surname><given-names>И. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Stepuro</surname><given-names>I. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Степуро Иван Иванович – канд. биол. наук, доцент, заведующий лабораторией</p><p>БЛК, 50, 230030, г. Гродно</p></bio><bio xml:lang="en"><p>Ivan I. Stepuro – Ph. D. (Biol.), Associated Professor, Head of the Laboratory</p><p>BLK, 50, 230030, Grodno</p></bio><email xlink:type="simple">scepura@gmail.com</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>Лабор</surname><given-names>С. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Labor</surname><given-names>S. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Лабор Светлана Алексеевна – аспирант, мл. науч. сотрудник</p><p>БЛК, 50, 230030, г. Гродно</p></bio><bio xml:lang="en"><p>Svetlana A. Labor – Postgraduate student, Junior researcher</p><p>BLK, 50, 230030, Grodno</p></bio><email xlink:type="simple">swet.labor2010@yandex.by</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>Степуро</surname><given-names>В. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Stsiapura</surname><given-names>V. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Степуро Виталий Иванович – канд. физ.-мат. наук, доцент, вед. науч. сотрудник</p><p>ул. Ожешко, 22, 230023, г. Гродно</p></bio><bio xml:lang="en"><p>Vitali I. Stsiapura – Ph. D. (Phys. and Math.), Associated Professor, Leading researcher</p><p>22, Ozheshko Str., 230023, Grodno</p></bio><email xlink:type="simple">stsiapura@gmail.com</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Янцевич</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Yantsevich</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Янцевич Алексей Викторович – канд. хим. наук, заведующий лабораторией</p><p>ул. Купревича, 5/2, 220141, г. Минск</p></bio><bio xml:lang="en"><p>Aleksey V. Yantsevich – Ph. D. (Chem.), Head of the Laboratory</p><p>5/2, Kuprevich Str., 220141, Minsk</p></bio><xref ref-type="aff" rid="aff-3"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт биохимии биологически активных соединений НАН Беларуси</institution></aff><aff xml:lang="en"><institution>Institute of Biochemistry of Biologically Active Compounds of the National Academy of Sciences of Belarus</institution></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Гродненский государственный университет им. Я. Купалы</institution></aff><aff xml:lang="en"><institution>Yanka Kupala State University of Grodno</institution></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>Институт биоорганической химии НАН Беларуси</institution></aff><aff xml:lang="en"><institution>Institute of Bioorganic Chemistry of the National Academy of Sciences of Belarus</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2020</year></pub-date><pub-date pub-type="epub"><day>16</day><month>05</month><year>2020</year></pub-date><volume>65</volume><issue>2</issue><fpage>199</fpage><lpage>211</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Степуро И.И., Лабор С.А., Степуро В.И., Янцевич А.В., 2020</copyright-statement><copyright-year>2020</copyright-year><copyright-holder xml:lang="ru">Степуро И.И., Лабор С.А., Степуро В.И., Янцевич А.В.</copyright-holder><copyright-holder xml:lang="en">Stepuro I.I., Labor S.A., Stsiapura V.I., Yantsevich A.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://vestibio.belnauka.by/jour/article/view/669">https://vestibio.belnauka.by/jour/article/view/669</self-uri><abstract><p>При воздействии ультрафиолета UVA (λ = 315–400 нм) и видимого света (λ &gt; 400 нм) на водные растворы тиамина в смеси c рибофлавином тиамин окисляется в тиохром и оксодигидротиохром. Окисление тиамина в тиохром в аэробных условиях происходит с участием синглетного кислорода. В анаэробных условиях при воздействии ультрафиолета и видимого излучения на водные растворы тиамина последний в присутствии рибофлавина не окисляется. Тиохром в аэробных условиях под действием как синглетного кислорода, так и фотосенсибилизатора (рибофлавина в триплетном состоянии) окисляется с образованием оксодигидротиохрома. В анаэробных условиях окисление тиохрома с образованием оксодигидротиохрома происходит с участием фотосенсибилизатора рибофлавина в триплетном состоянии.</p><p>В работе обсуждаются возможные механизмы повреждения клеточных структур глаза вследствие инактивации тиамин-зависимых ферментов под действием интенсивного видимого света в присутствии эндогенного фотосенсибилизатора – рибофлавина.</p></abstract><trans-abstract xml:lang="en"><p>It was shown the irradiation of aqueous solutions of thiamine and riboflavin with ultraviolet UVA (315–400 nm) and visible light (λ &gt; 400 nm) leads to oxidation of thiamine to thiochrome and oxodihydrothiochrome. In absence of riboflavin in aerobic conditions thiamine oxidation to thiochrome was mainly due to reaction with singlet oxygen. Under anaerobic conditions, thiamine in the presence of riboflavin was photostable and UV and visible light irradiation of their aqueous solutions did not result in thiamine oxidation. Under aerobic conditions, thiochrome was oxidized to form oxodihydrothiohrome in reactions with singlet oxygen and riboflavin in triplet states. Under anaerobic conditions, oxidation of thiochrome to oxodihydrothiochrome occurred due to reaction with riboflavin in triplet state. Possible mechanisms of the damage of cellular eye structures due to inactivation of thiamine-dependent enzymes on exposure to intensive UVA and visible light in the presence of endogenous photosensitizer riboflavin are discussed.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>тиамин</kwd><kwd>рибофлавин</kwd><kwd>тиохром</kwd><kwd>оксодигидротиохром</kwd><kwd>ультрафиолет UVA</kwd><kwd>видимый свет</kwd></kwd-group><kwd-group xml:lang="en"><kwd>thiamin</kwd><kwd>riboflavin</kwd><kwd>thiochrome</kwd><kwd>oxodihydrothiochrome</kwd><kwd>ultraviolet UVA</kwd><kwd>visible light</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена при поддержке Белорусского республиканского фонда фундаментальных исследований (грант № М18-157) и Государственной программы научных исследований «Химические технологии и материалы» (задание 5.28).</funding-statement><funding-statement xml:lang="en">This work was supported by Belarusian Foundation for Basic Research (grant M18-157) and State program of scientific research «Chemical Technologies and Materials» (project 5.28).</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Davies, M. 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