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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">Aspirantskiy Vestnik Povolzhiya</journal-id><journal-title-group><journal-title xml:lang="en">Aspirantskiy Vestnik Povolzhiya</journal-title><trans-title-group xml:lang="ru"><trans-title>Аспирантский вестник Поволжья</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2072-2354</issn><issn publication-format="electronic">2410-3764</issn><publisher><publisher-name xml:lang="en">Samara State Medical University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">698869</article-id><article-id pub-id-type="doi">10.35693/AVP698869</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>PHARMACEUTICAL CHEMISTRY, PHARMACOGNOSY</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>ФАРМАЦЕВТИЧЕСКАЯ ХИМИЯ, ФАРМАКОГНОЗИЯ</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">Application of IR-spectrometry and independent component analisys for the quantitative determination of ademethionine in tablets</article-title><trans-title-group xml:lang="ru"><trans-title>Применение ИК-спектрометрии и метода независимых компонент для количественного определения адеметионина в таблетках</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-4871-5868</contrib-id><name-alternatives><name xml:lang="en"><surname>Kachalkina</surname><given-names>Irina V.</given-names></name><name xml:lang="ru"><surname>Качалкина</surname><given-names>Ирина Владимировна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Senior specialist, Scientific and educational center “Pharmacy”.</p></bio><bio xml:lang="ru"><p>главный специалист научно-образовательного центра «Фармация».</p></bio><email>i.v.sokolova@samsmu.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4581-8610</contrib-id><name-alternatives><name xml:lang="en"><surname>Ryazanova</surname><given-names>Tatyana K.</given-names></name><name xml:lang="ru"><surname>Рязанова</surname><given-names>Т. К.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Dr. Sci. (Pharmacy), Professor, Director of the Scientific and educational center “Pharmacy”.</p></bio><bio xml:lang="ru"><p>д-р фарм. наук, профессор, директор научно-образовательного центра «Фармация».</p></bio><email>t.k.ryazanova@samsmu.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-4356-9435</contrib-id><name-alternatives><name xml:lang="en"><surname>Kachalkin</surname><given-names>Maksim N.</given-names></name><name xml:lang="ru"><surname>Качалкин</surname><given-names>М. Н.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Cand. Sci. (Pharmacy), Senior specialist, Scientific and educational center “Pharmacy”.</p></bio><bio xml:lang="ru"><p>канд. фарм. наук, главный специалист научно-образовательного центра «Фармация».</p></bio><email>m.n.kachalkin@samsmu.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Samara State Medical University</institution></aff><aff><institution xml:lang="ru">ФГБОУ ВО «Самарский государственный медицинский университет» Минздрава России</institution></aff></aff-alternatives><pub-date date-type="preprint" iso-8601-date="2026-05-07" publication-format="electronic"><day>07</day><month>05</month><year>2026</year></pub-date><pub-date date-type="pub" iso-8601-date="2026-06-12" publication-format="electronic"><day>12</day><month>06</month><year>2026</year></pub-date><volume>26</volume><issue>2</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>49</fpage><lpage>57</lpage><history><date date-type="received" iso-8601-date="2025-12-18"><day>18</day><month>12</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2026-04-19"><day>19</day><month>04</month><year>2026</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2026, Kachalkina I.V., Ryazanova T.K., Kachalkin M.N.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2026, Качалкина И.В., Рязанова Т.К., Качалкин М.Н.</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="en">Kachalkina I.V., Ryazanova T.K., Kachalkin M.N.</copyright-holder><copyright-holder xml:lang="ru">Качалкина И.В., Рязанова Т.К., Качалкин М.Н.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://aspvestnik.ru/2410-3764/article/view/698869">https://aspvestnik.ru/2410-3764/article/view/698869</self-uri><abstract xml:lang="en"><p><bold>Aim:</bold> evaluation of the metrological characteristics of the method for the quantitative determination of ademethionine in tablets by IR-spectrometry in the attenuated total internal reflection mode using the independent component analysis.</p> <p><bold>Material and methods. </bold>IR-spectra were recorded using an Agilent Cary 630 FTIR spectrometer in the attenuated total internal reflection mode (crystal - diamond) in the wavenumber range from 4000 to 650 cm<sup>-</sup>¹ with a resolution of 4 cm<sup>-</sup>¹. The processing of IR-spectra was performed using Agilent Microlab Expert 1.0.0.7 software (IR-spectra registration, ATR correction) and KNIME 5.3.2 with pre-installed Python 3.9.7 libraries. To conduct the study, we used the drug “Heptral”, enteric-coated tablets, 500 mg, the pharmaceutical substance ademethionine 1,4-butanedisulfonate and excipients.</p> <p><bold>Results.</bold> A chemometric model based on independent component analysis is proposed. The model includes an optimization procedure for selecting the optimal number of independent components and accounts for the effect of spectral transformations on the predictive performance of the mathematical model. The metrological characterization methodology was assessed and all independent components and their relationship to characteristic frequencies were interpreted.</p> <p><bold>Conclusions. </bold>The possibility of using the independent component analysis in the quantitative ratio of ademethionine in tablets using IR-spectrometry in the total internal reflection distortion mode with preliminary chemometric processing of the analytical signal has been shown. The optimal parameters of the mathematical model were selected (number of components, type of coordinate line correction). The relative error of the resulting model is less than 1%.</p></abstract><trans-abstract xml:lang="ru"><p><bold>Цель:</bold> оценка метрологических характеристик методики количественного определения адеметионина в таблетках методом ИК-спектрометрии в режиме нарушенного полного внутреннего отражения с применением метода независимых компонент.</p> <p><bold>Материал и методы. </bold>ИК-спектры регистрировали с помощью спектрометра Agilent Cary 630 FTIR в режиме нарушенного полного внутреннего отражения (кристалл – алмаз) в диапазоне волновых чисел от 4000 до 650 см<sup>-1</sup> с разрешением 4 см<sup> -1</sup>, число сканов – 10. Обработка ИК-спектров осуществлялась в программном обеспечении Agilent Microlab Expert 1.0.0.7 (регистрация ИК-спектров, ATR-коррекция) и KNIME 5.3.2 с предустановленными модулями Python 3.9.7. Для выполнения исследования использовали лекарственный препарат «Гептрал», таблетки кишечнорастворимые, покрытые пленочной оболочкой, 500 мг, фармацевтическую субстанцию адеметионина 1,4-бутандисульфонат и вспомогательные вещества.</p> <p><bold>Результаты. </bold>Предложена хемометрическая модель на основе метода независимых компонент, осуществлен подбор оптимального количества независимых компонент, учтено влияние коррекции базовой линии на результат прогноза математической модели. Проведена оценка метрологических характеристик предлагаемой методики и интерпретация весов независимых компонент и их связи с характеристическими частотами.</p> <p><bold>Выводы. </bold>Показана возможность применения метода независимых компонент в количественном определении адеметионина в таблетках методом ИК-спектрометрии в режиме нарушенного полного внутреннего отражения с предварительной хемометрической обработкой аналитического сигнала. Выбраны оптимальные параметры математической модели (количество компонент, вид коррекции базовой линии). Относительная погрешность среднего результата для полученной модели составила менее 1%.</p></trans-abstract><kwd-group xml:lang="en"><kwd>infrared spectrometry</kwd><kwd>ademethionine</kwd><kwd>independent component analysis</kwd><kwd>chemometrics</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>инфракрасная спектрометрия</kwd><kwd>адеметионин</kwd><kwd>метод независимых компонент</kwd><kwd>хемометрика</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Bottiglieri T. S-Adenosyl-L-methionine (SAMe): from the bench to the bedside-molecular basis of a pleiotrophic molecule. Am J Clin Nutr. 2002;76(5):1151S-7S. DOI: 10.1093/ajcn/76/5.1151S</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Saigal S, Kapoor D, Roy DS. Ademethionine in patients with liver disease: a review. 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