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<article 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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Journal of Analytical Chemistry</journal-id><journal-title-group><journal-title xml:lang="en">Journal of Analytical Chemistry</journal-title><trans-title-group xml:lang="ru"><trans-title>Журнал аналитической химии</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0044-4502</issn><issn publication-format="electronic">3034-512X</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">697723</article-id><article-id pub-id-type="doi">10.7868/S3034512X25120048</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>ORIGINAL ARTICLES</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>ОРИГИНАЛЬНЫЕ СТАТЬИ</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">DETERMINATION OF DOXORUBICIN BASED ON QUENCHING OF LUMINESCENCE OF ALLOYED QUANTUM DOTS</article-title><trans-title-group xml:lang="ru"><trans-title>ОПРЕДЕЛЕНИЕ ДОКСОРУБИЦИНА НА ОСНОВЕ ТУШЕНИЯ ЛЮМИНЕСЦЕНЦИИ СПЛАВНЫХ КВАНТОВЫХ ТОЧЕК</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Koganova</surname><given-names>D. G</given-names></name><name xml:lang="ru"><surname>Коганова</surname><given-names>Д. Г</given-names></name></name-alternatives><email>Koganovadara43@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Tsyupka</surname><given-names>D. V</given-names></name><name xml:lang="ru"><surname>Цюпка</surname><given-names>Д. В</given-names></name></name-alternatives><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Drozd</surname><given-names>D. D</given-names></name><name xml:lang="ru"><surname>Дрозд</surname><given-names>Д. Д</given-names></name></name-alternatives><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Mescheriakova</surname><given-names>S. A</given-names></name><name xml:lang="ru"><surname>Мещерякова</surname><given-names>С. А</given-names></name></name-alternatives><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Pidenko</surname><given-names>P. S</given-names></name><name xml:lang="ru"><surname>Пиденко</surname><given-names>П. С</given-names></name></name-alternatives><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kornilov</surname><given-names>D. A</given-names></name><name xml:lang="ru"><surname>Корнилов</surname><given-names>Д. А</given-names></name></name-alternatives><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Goryacheva</surname><given-names>O. A</given-names></name><name xml:lang="ru"><surname>Горячева</surname><given-names>О. А</given-names></name></name-alternatives><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Goryacheva</surname><given-names>I. Yu</given-names></name><name xml:lang="ru"><surname>Горячева</surname><given-names>И. Ю</given-names></name></name-alternatives><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Saratov State University named after N. G. Chernyshevsky</institution></aff><aff><institution xml:lang="ru">Саратовский государственный университет им. Н.Г. Чернышевского</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2025</year></pub-date><volume>80</volume><issue>12</issue><issue-title xml:lang="en">VOL 80, NO12 (2025)</issue-title><issue-title xml:lang="ru">ТОМ 80, №12 (2025)</issue-title><fpage>1319</fpage><lpage>1330</lpage><history><date date-type="received" iso-8601-date="2025-12-04"><day>04</day><month>12</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Российская академия наук</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/" start_date="2026-12-15"/></permissions><self-uri xlink:href="https://rjsvd.com/0044-4502/article/view/697723">https://rjsvd.com/0044-4502/article/view/697723</self-uri><abstract xml:lang="en"><p>A sensitive, simple method for determining doxorubicin (Dox) in biological fluids, which does not require complex sample preparation, has been developed based on the quenching of luminescence of thioglycolic acid-stabilized CdZnSeS/ZnS quantum dots (QDs). Luminescence quenching was studied in model solutions and human blood plasma to establish optimal determination parameters. Optimal conditions for Dox detection were selected: QDs with optical density A<sub>λ=360</sub> = 0.05 and 25-fold plasma dilution. The developed method was applied to analyze a human blood sample. The limit of detection for Dox was 0.02 µg/mL, the limit of quantification 0.18 µg/mL, the linear range 0.27–4.07 µg/mL (R<sup>2</sup> &gt; 0.96); the method showed good reproducibility (s<sub>r</sub> from 1.08 to 1.19%). The method's accuracy was confirmed by HPLC with UV detection.</p></abstract><trans-abstract xml:lang="ru"><p>Разработан чувствительный, простой и не требующий сложной пробоподготовки метод определения доксорубицина (Докс) в биожидкостях, основанный на тушении люминесценции квантовых точек (КТ) CdZnSeS/ZnS, стабилизированных тиогликолевой кислотой. Изучено тушение люминесценции в модельных растворах и плазме крови человека с целью установления оптимальных параметров определения. Подобраны оптимальные условия для обнаружения Докс: КТ с оптической плотностью <italic>A</italic><sub>λ=360</sub> = 0.05 и разбавление плазмы в 25 раз. Разработанный метод применен для анализа образца крови человека. Предел обнаружения Докс составил 0.02 мкг/мл, предел количественного определения – 0.18 мкг/мл, линейный диапазон – 0.27–4.07 мкг/мл (<italic>R</italic><sup>2</sup> &gt; 0.96); метод показал хорошую воспроизводимость (s<sub>r</sub> от 1.08 до 1.19%). Правильность метода подтверждена методом ВЭЖХ с УФ-детектированием.</p></trans-abstract><kwd-group xml:lang="en"><kwd>doxorubicin</kwd><kwd>quantum dots</kwd><kwd>luminescence quenching</kwd><kwd>clinical analyses</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>доксорубицин</kwd><kwd>квантовые точки</kwd><kwd>тушение люминесценции</kwd><kwd>клинические анализы</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена при поддержке Российского Научного Фонда (грант № 23-13-00380)</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Sikora T., Szczepanek K., Korona-Głowniak I., Barbasz A., Czyżowska A., Kazik V., Barbasz J. Application of optical methods for determination of concentration of doxorubicin in blood and plasma // Pharmaceuticals. 2022. V. 15. № 2. 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