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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-1861</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>Определение кинетических характеристик диссоциации комплексов мета-тетра(гидроксифенил)хлорина и сополимера декстран-поли-N-изопропилакриламида методом флуоресцентной спектроскопии</article-title><trans-title-group xml:lang="en"><trans-title>Determination of Kinetic Characteristics of Dissociation of Complexes Meta-Tetra(Hydroxyphenyl)Chlorine and Dextran-Poly-N-Isopropylacryl-amide Copolymer by Fluorescence Spectroscopy</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>Коблов</surname><given-names>И. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Kablov</surname><given-names>I. 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">iv.kablov@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>Кравченко</surname><given-names>И. Е.</given-names></name><name name-style="western" xml:lang="en"><surname>Kravchenko</surname><given-names>I. E.</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>Зорина</surname><given-names>Т. Е.</given-names></name><name name-style="western" xml:lang="en"><surname>Zorina</surname><given-names>T. E.</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>Зорин</surname><given-names>В. П.</given-names></name><name name-style="western" xml:lang="en"><surname>Zorin</surname><given-names>V. P.</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-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Белорусский государственный университет</institution></aff><aff xml:lang="en"><institution>Belarusian State University</institution></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Белорусский государственный университет; Международный государственный экологический институт им. А.Д. Сахарова Белорусского государственного университета</institution></aff><aff xml:lang="en"><institution>Belarusian State University; A.D. Sakharov International State Environmental Institute of the Belarusian State University</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>20</day><month>05</month><year>2025</year></pub-date><volume>92</volume><issue>3</issue><fpage>378</fpage><lpage>385</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Коблов И.В., Кравченко И.Е., Зорина Т.Е., Зорин В.П., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Коблов И.В., Кравченко И.Е., Зорина Т.Е., Зорин В.П.</copyright-holder><copyright-holder xml:lang="en">Kablov I.V., Kravchenko I.E., Zorina T.E., Zorin V.P.</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/1861">https://zhps.ejournal.by/jour/article/view/1861</self-uri><abstract><p>С использованием методов флуоресцентной спектроскопии исследована способность термочувствительного сополимера декстран-поли-N-изопропилакриламида (Д-ПNИПАМ) связывать и высвобождать фотосенсибилизатор (ФС) мета-тетра(гидроксифенил)хлорин (мТГФХ). Показано, что эффективность сорбции молекул мТГФХ сополимером зависит от его фазового состояния: при температуре ˂34—35 °С мТГФХ эффективно захватывается Д-ПNИПАМ (сополимер в глобулярной конформации), но при температурах ˃34—35 °С ФС практически не адсорбируется на Д-ПNИПАМ (сополимер в клубкообразной конформации). Методом динамического рассеяния света показано наличие дополнительных структурных перестроек в глобуле Д-ПNИПАМ под действием высоких температур (˃45 °С). Проведено сравнение скоростей диссоциации мТГФХ из комплексов с Д-ПNИПАМ, формировавшихся в диапазоне температур 37—60 °С, рассчитаны константы скорости выхода мТГФХ из полимерной глобулы. Показано, что высокая температура комплексообразования (45—60 °С) мТГФХ с Д-ПNИПАМ приводит к увеличению практически в два раза скорости выхода молекул ФС из состава глобулы сополимера при физиологических температурах по сравнению с аналогичными комплексами, образованными при температуре 37—40 °С. Проведена оценка времени, необходимого для термоиндуцируемых структурных перестроек в Д-ПNИПАМ. Переход глобула–клубок в молекуле Д-ПNИПАМ, вызванный снижением температуры ˂34—35 °С, осуществляется менее чем за 1 мин, в то время как для обратимости конформационных изменений в глобуле сополимера при повышении температуры среды ˃45 °С требуется ~150 мин. Полученные результаты позволяют предположить, что термозависимые конформационные перестройки в сополимере Д-ПNИПАМ могут быть использованы для эффективной регуляции скорости диссоциации ФС в клеточных и тканевых системах.</p></abstract><trans-abstract xml:lang="en"><p>The ability of the thermosensitive copolymer dextran-poly-N-isopropylacrylamide (D-PNIPAM) to bind and release the photosensitizer (PS) meta-tetra(hydroxyphenyl)chlorin (mTHPC) was investigated using fluorescence spectroscopy techniques. It is shown that the efficiency of mTHPC molecules sorption by the copolymer depends on its phase state: mTHPC is efficiently adsorbed by D-PNIPAM (copolymer in globular conformation) at temperatures above 34–35 C, but PS is practically not adsorbed on D-PNIPAM (copolymer in coil conformation) at temperatures below 34–35 C. The presence of additional structural rearrangements in the globule of D-PNIPAM under the action of high temperatures (above 45°C) was shown by the method of dynamic light scattering. Comparing the mTHPC dissociation rates from complexes with DPNIPAM formed at 37-60 °C and calculating the mTHPC release rate constants from the polymer globule were performed. It is shown that the high temperature of complexation (45–60 C) of mTHPC with DPNIPAM leads to almost a twofold increase in the rate of PS molecules release from the copolymer globule at physiological temperatures, compared to similar complexes formed at 37–40°C. The time required for thermally induced structural rearrangements in D-PNIPAM has been estimated. The globule-coil transition in the D-PNIPAM molecule caused by temperature decrease below 34–35°C takes less than a minute, while the reversibility of conformational changes in the copolymer globule when the medium temperature rises above 45°C requires about 150 min. The obtained results suggest that thermo-dependent conformational rearrangements in the D-PNIPAM copolymer can be used to efficiently regulate the rate of PS release in cellular and tissue systems.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>мета-тетра(гидроксифенил)хлорин</kwd><kwd>термочувствительный сополимер</kwd><kwd>скорость диссоциации</kwd><kwd>фазовый переход</kwd></kwd-group><kwd-group xml:lang="en"><kwd>meta-tetra(hydroxyphenyl)chlorin</kwd><kwd>thermosensitive copolymer</kwd><kwd>dissociation rate</kwd><kwd>phase transition</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена при поддержке ГПНИ “Биотехнологии-2” (задание 1.29.2) и ГПНИ “Конвергенция-2025” (задание 3.03.7.2), Белорусского республиканского фонда фундаментальных исследований (грант № М24МП-024)</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">W. 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