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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-2423</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>Валидация УФ-спектрофотометрических методов производных разного порядка для определения содержания темозоломида в нерасфасованном виде и лекарственной форме</article-title><trans-title-group xml:lang="en"><trans-title>Validation of Derivative UV Spectrophotometric Methods for Estimation of Temozolomide in Bulk and in Formulatio</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>Kumar</surname><given-names>A.</given-names></name><name name-style="western" xml:lang="en"><surname>Kumar</surname><given-names>Akshay</given-names></name></name-alternatives><bio xml:lang="ru"><p>Чандигарх</p></bio><bio xml:lang="en"><p>Chandigarh</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>Bali</surname><given-names>A.</given-names></name><name name-style="western" xml:lang="en"><surname>Bali</surname><given-names>Alka</given-names></name></name-alternatives><bio xml:lang="ru"><p>Чандигарх</p></bio><bio xml:lang="en"><p>Chandigarh</p></bio><email xlink:type="simple">alka.bali@rediffmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Центр передовых исследований UGC, Пенджабский университет</institution><country>Индия</country></aff><aff xml:lang="en"><institution>University Institute of Pharmaceutical Sciences, UGC Centre of Advanced Study, Panjab University</institution><country>India</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>28</day><month>09</month><year>2026</year></pub-date><volume>93</volume><issue>5</issue><fpage>727</fpage><lpage>727</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Kumar A., Bali A., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Kumar A., Bali A.</copyright-holder><copyright-holder xml:lang="en">Kumar A., Bali A.</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/2423">https://zhps.ejournal.by/jour/article/view/2423</self-uri><abstract><p>Описана валидация простых, экономически эффективных спектрофотометрических методов производных нулевого, первого и второго порядков для определения темозоломида (алкилирующего ДНК-агента, используемого для лечения некоторых типов рака головного мозга) в чистом виде и в лекарственных формах. Предварительный спектрофотометрический анализ препарата проводился в растворах гидроксида натрия (0.1 Н) и соляной кислоты (0.1 Н). Рассмотрено 25 вариантов методов. Три варианта метода измерения поглощения (нулевой порядок), пик- пик (первый порядок) и пикнуль (второй порядок) валидированы по параметрам линейности, точности, прецизионности и робастности. В диапазоне концентраций 5.0–40.0 мкг/мл наблюдалась хорошая линейность с коэффициентом корреляции 0.99 и выше для выбранных вариантов метода. Пределы обнаружения анализа варьировались от 0.53 до 1.09 мкг/мл, пределы количественного определения — от 1.61 до 3.33 мкг/мл. Предложенные методы использованы для количественного определения препарата в его таблетированной форме, получены показатели извлечения в диапазоне 97.50–99.05%. </p></abstract><trans-abstract xml:lang="en"><p>Temozolomide is a DNA alkylating agent used to treat specific types of brain cancer. This report describes the validation of simple, rapid, sensitive, and cost-effective zero-order, first-order, and second-order derivative spectrophotometric methods for the estimation of temozolomide in bulk and in its marketed formulation. Preliminary spectrophotometric analysis of the drug was carried out in sodium hydroxide (0.1 N) and hydrochloric acid (0.1 N), and a total of 25 parametric variations were explored. Three method variants employing absorbance (zero-order), peak-to-peak (first-order), and peak-to-zero (second-order) techniques were validated for linearity, accuracy, precision, and robustness. The developed method was validated with respect to parameters including linearity, accuracy, precision, robustness, and solution stability. Excellent linearity was observed in the concentration range of 5.0–40.0 μg/mL, with correlation coefficients of 0.99 or higher for the selected method variants. The assay detection limits ranged from 0.53–1.09 μg/mL, and quantitation limits ranged from 1.61–3.33 μg/mL for the proposed method variants. The proposed methods were used to quantify the drug in its marketed tablet formulation, yielding good recoveries ranging from 97.50–99.05%.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>темозоломид</kwd><kwd>спектрофотометрия</kwd><kwd>валидация метода</kwd><kwd>производная первого порядка</kwd><kwd>производная второго порядка</kwd></kwd-group><kwd-group xml:lang="en"><kwd>temozolomide</kwd><kwd>spectrophotometric</kwd><kwd>method validation</kwd><kwd>derivative spectrophotometry</kwd><kwd>first derivative</kwd><kwd>second derivative</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">This work was supported by the University Grants Commission (UGC), New Delhi, India (Grant No. 36/N/296). We express our sincere thanks to Beta Drugs Limited (India) for graciously providing us with pure drug samples of temozolomide. We acknowledge the financial assistance received from the Ministry of Tribal Affairs, Government of India, under the National Fellowship for Scheduled Tribes (NFST). The Authors are grateful to the Contribution of DST-FIST laboratory, UIPS, for this study.</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">A. S. Karve, J. M. Desai, S. N. Gadgil, N. Dave, T. M. Wise-Draper, G. A. Gudelsky, T. N. Phoenix, B. DasGupta, L. Yogendran, S. Sengupta, D. R. Plas, P. B. Desai, Int. J. Mol. Sci., 25, No. 6, 3217–3238 (2024).</mixed-citation><mixed-citation xml:lang="en">A. S. Karve, J. M. Desai, S. N. Gadgil, N. Dave, T. M. Wise-Draper, G. A. Gudelsky, T. N. Phoenix, B. DasGupta, L. Yogendran, S. Sengupta, D. R. Plas, P. B. Desai, Int. J. Mol. 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