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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-2097</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>АННОТАЦИИ АНГЛОЯЗЫЧНЫХ СТАТЕЙ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>ABSTRACTS ENGLISH-LANGUAGE ARTICLES</subject></subj-group></article-categories><title-group><article-title>Получение легированных азотом углеродных квантовых точек и анализ их флуоресценции при взаимодействии с витамином B2</article-title><trans-title-group xml:lang="en"><trans-title>Preparation of Nitrogen-Doped Carbon Quantum Dots and Analysis and Detection of Vitamin B2</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>Yang</surname><given-names>H.</given-names></name><name name-style="western" xml:lang="en"><surname>Yang</surname><given-names>Hui</given-names></name></name-alternatives><bio xml:lang="ru"><p>Сюйчжоу, Цзянсу</p></bio><bio xml:lang="en"><p>Department of Pharmacy</p><p>Xuzhou, Jiangsu</p></bio><email xlink:type="simple">3070714927@qq.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>Yang</surname><given-names>X.</given-names></name><name name-style="western" xml:lang="en"><surname>Yang</surname><given-names>Xiucheng</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ханчжоу, Чжэцзян</p></bio><bio xml:lang="en"><p>Hangzhou, Zhejiang</p></bio><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Фармацевтический профессиональный колледж Сюйчжоу провинции Цзянсу</institution></aff><aff xml:lang="en"><institution>Jiangsu Provincial Xuzhou Pharmaceutical Vocational College</institution></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Вторая больница при Медицинском факультете Чжэцзянского университета</institution></aff><aff xml:lang="en"><institution>The Second Affiliated Hospital Zhejiang University School of Medicine</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>22</day><month>01</month><year>2026</year></pub-date><volume>93</volume><issue>1</issue><fpage>144</fpage><lpage>144</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Yang H., Yang X., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Yang H., Yang X.</copyright-holder><copyright-holder xml:lang="en">Yang H., Yang X.</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/2097">https://zhps.ejournal.by/jour/article/view/2097</self-uri><abstract><p>Углеродные квантовые точки, легированные азотом (N-CQD), получены из лимонной кислоты (в качестве источника углерода) и мочевины (в качестве источника азота) путем нагревания и применены для обнаружения витамина B2. N-CQD продемонстрировали превосходную флуоресцентную эффективность и стабильность. Структура образца охарактеризована с помощью УФ-видимой спектрофотометрии, флуороспектрофотометрии и ИК-Фурье-спектроскопии. Изучены и оптимизированы оптимальный pH, время ультразвуковой реакции и концентрация витамина B2 для N-CQD. Анализ с помощью флуороспектрофотометрии в оптимальных условиях (50 мкл N-CQD, 2 мл буферного раствора с pH 4.0, время реакции 30 мин) показал, что витамин B2 вызывает значительное тушение флуоресценции N-CQD. При стандартной степени обнаружения &gt;80% полученные N-CQD могут служить флуоресцентными зондами для анализа и обнаружения витамина B2 в пищевых продуктах.</p></abstract><trans-abstract xml:lang="en"><p>This paper focuses on the preparation of nitrogen-doped carbon quantum dots (N-CQDs) from citric acid and urea, and their application in the detection of Vitamin B2. Citric acid was used as the carbon source and urea as the nitrogen source. N-CQDs were prepared by heating, after which they displayed excellent fluorescence performance and stability. The structure of the sample was then characterized using UV-visible spectrophotometry, fluorospectrophotometry, and Fourier Transform Infrared spectroscopy. Optimal pH, ultrasonic reaction time, and Vitamin B2 concentration for the N-CQDs were studied and optimized. Under optimal conditions (50 µL of N-CQDs, 2 mL of buffer solution with pH 4.0, and a reaction time of 30 min), the analysis and detection using fluorospectrophotometry demonstrated that Vitamin B2 caused significant fluorescence quenching of the prepared N-CQDs. With the standard recovery rate above 80%, these N-CQDs can serve as fluorescence probes for the analysis and detection of Vitamin B2 in actual food.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>квантовые точки</kwd><kwd>витамин B2</kwd><kwd>тушение флуоресценции</kwd><kwd>флуоресцентный зонд</kwd></kwd-group><kwd-group xml:lang="en"><kwd>carbon quantum dots</kwd><kwd>Vitamin B2</kwd><kwd>fluorescence quenching</kwd><kwd>fluorescence probe</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">Y. Liu, C. Liu, C. Shi, et al., J. Alloys and Compd., 881, 160437 (2021).</mixed-citation><mixed-citation xml:lang="en">Y. Liu, C. Liu, C. Shi, et al., J. Alloys and Compd., 881, 160437 (2021).</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">M. O. Caglayan, F. Mindivan, S. Şahin, Crit. Rev. Anal. 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