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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">zhps</journal-id><journal-title-group><journal-title xml:lang="ru">Журнал прикладной спектроскопии</journal-title><trans-title-group xml:lang="en"><trans-title>Zhurnal Prikladnoii Spektroskopii</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0514-7506</issn><publisher><publisher-name>B. I. Stepanov Institute of Physics of the National Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">zhps-1670</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>СПЕКТРОСКОПИЯ В БИОЛОГИИ И МЕДИЦИНЕ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>SPECTROSCOPY IN BIOLOGY AND MEDICINE</subject></subj-group></article-categories><title-group><article-title>Фотофизические особенности протолитических равновесий бифлуорофоров флуоресцеина</article-title><trans-title-group xml:lang="en"><trans-title>Photophysical Features of Protolytic Equilibria of Fluorescein Bifluorophores</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>Фань</surname><given-names>Ф.</given-names></name><name name-style="western" xml:lang="en"><surname>Fan</surname><given-names>F.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Минск</p></bio><bio xml:lang="en"><p>Minsk</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Поведайло</surname><given-names>В. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Povedailo</surname><given-names>V. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Минск</p></bio><bio xml:lang="en"><p>Minsk</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Лысенко</surname><given-names>И. Л.</given-names></name><name name-style="western" xml:lang="en"><surname>Lysenko</surname><given-names>I. L.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Минск</p></bio><bio xml:lang="en"><p>Minsk</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Шарко</surname><given-names>О. Л.</given-names></name><name name-style="western" xml:lang="en"><surname>Sharko</surname><given-names>O. L.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Минск</p></bio><bio xml:lang="en"><p>Minsk</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Мазунин</surname><given-names>И. О.</given-names></name><name name-style="western" xml:lang="en"><surname>Mazunin</surname><given-names>I. O.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Москва</p></bio><bio xml:lang="en"><p>Moscow</p></bio><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Тихомиров</surname><given-names>С. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Tikhomirov</surname><given-names>S. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Минск</p></bio><bio xml:lang="en"><p>Minsk</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Шманай</surname><given-names>В. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Shmanai</surname><given-names>V. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Минск</p></bio><bio xml:lang="en"><p>Minsk</p></bio><email xlink:type="simple">shmanai@ifoch.bas-net.by</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт физико-органической химии НАН Беларуси</institution></aff><aff xml:lang="en"><institution>Institute of Physical-Organic Chemistry of the National Academy of Sciences</institution></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Институт физики НАН Беларуси</institution></aff><aff xml:lang="en"><institution>B. I. Stepanov Institute of Physics of the National Academy&#13;
of Sciences of Belarus</institution></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>Центр молекулярной и клеточной биологии Сколковского института науки и технологий</institution></aff><aff xml:lang="en"><institution>Center for Molecular and Cellular Biology of the Skolkovo Institute of Science and Technology</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>23</day><month>10</month><year>2024</year></pub-date><volume>91</volume><issue>5</issue><fpage>723</fpage><lpage>732</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Фань Ф., Поведайло В.А., Лысенко И.Л., Шарко О.Л., Мазунин И.О., Тихомиров С.А., Шманай В.В., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Фань Ф., Поведайло В.А., Лысенко И.Л., Шарко О.Л., Мазунин И.О., Тихомиров С.А., Шманай В.В.</copyright-holder><copyright-holder xml:lang="en">Fan F., Povedailo V.A., Lysenko I.L., Sharko O.L., Mazunin I.O., Tikhomirov S.A., Shmanai V.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://zhps.ejournal.by/jour/article/view/1670">https://zhps.ejournal.by/jour/article/view/1670</self-uri><abstract><p>   Исследовано влияние pH и состава раствора на фотофизические свойства карбоксифлуоресцеиновых бифлуорофоров, а также проведено сравнение флуоресцентного эффекта бифлуорофоров с мономерными карбоксифлуоресцеинами (5-FAM и 6-FAM) в конъюгатах с белковыми молекулами. Показано, что оба бифлуорофора хорошо флуоресцируют в щелочной среде, однако интенсивность флуоресценции снижается при pH 6 и 7 и практически исчезает в кислой среде. Флуоресценция мета-(6-FAM)2 чувствительна к составу раствора, в то время как для мета-(5-FAM)2 она более стабильна и практически не зависит от свойств раствора. При образовании конъюгата бифлуорофора с белком квантовый выход флуоресценции бифлуорофора снижается больше в сравнении с мономерами FAM, однако общая интенсивность флуоресценции не уступает интенсивности двух мономерных модификаций благодаря более высокому коэффициенту экстинкции бифлуорофора (~140000 М–1 . см–1).</p></abstract><trans-abstract xml:lang="en"><p>   The photophysical properties of these two carboxyfluorescein bifluorophores were investigated in more depth, including the effects of pH and different solution media on the photophysical properties, as well as comparing the fluorescence effect of bifluorophores with monomers carboxyfluoresceins (5-FAM and 6-FAM) in conjugates with protein molecules. The results showed that both bifluorophores fluoresced perfectly in alkaline medium, but the fluorescence intensity decreased at pH values of 6–7, and almost disappeared in acidic medium. The fluorescence of (6-FAM)2 is very sensitive to the solution composition, while (5-FAM)2 is more stable and almost independent of the solution medium. When bifluorophore-protein conjugate is formed, the quantum yield of bifluorophore fluorescence decreases more strongly compared to monomers carboxyfluoresceins, but the overall fluorescence intensity of the bifluorophore was not inferior to that of the two carboxyfluorescein monomer-protein conjugates due to the high extinction coefficient of the bifluorophore (~140,000 M–1 . cm–1).</p></trans-abstract><kwd-group xml:lang="ru"><kwd>флуоресцентная спектроскопия</kwd><kwd>квантовый выход флуоресценции</kwd><kwd>клик-химия</kwd><kwd>флуоресцеин</kwd></kwd-group><kwd-group xml:lang="en"><kwd>fluorescence spectroscopy</kwd><kwd>fluorescence quantum yields</kwd><kwd>click chemistry</kwd><kwd>fluorescein</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена при финансовой поддержке Фонда Совета по стипендиям Китая (грант № 202008400011), Белорусского республиканского фонда фундаментальных исследований (гранты № Ф24В-006 и № Х23РНФ-041), Российского научного фонда (грант № 23-45-10010)</funding-statement><funding-statement xml:lang="en">The work was carried out with the financial support of the China Scholarship Council Foundation (grant  No. 202008400011), the Belarusian Republican Foundation for Basic Research (grants  No. F24B-006 and No. X23RNF-041), Russian Science Foundation (grant No. 23-45-10010)</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">V. 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