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 <front>
 <journal-meta>
 <journal-id journal-id-type="publisher-id">dongu-vestnik01.ru</journal-id>
 <journal-title-group>
 <journal-title xml:lang="ru">Вестник Донецкого университета. Серия 01. Естественные науки</journal-title>
 <trans-title-group xml:lang="en">
 <trans-title>Vestnik of Donetsk University. Series 01. Natural Sciences</trans-title>
 </trans-title-group>
 </journal-title-group>
 <issn publication-format="electronic">2415-7058</issn>
 </journal-meta>
 <article-meta>
 <article-id pub-id-type="publisher-id">525</article-id>
 <article-id pub-id-type="doi">10.5281/zenodo.20799648</article-id>
 <article-categories>
 <subj-group subj-group-type="toc-heading" xml:lang="en">
 <subject>Articles</subject>
 </subj-group>
 <subj-group subj-group-type="toc-heading" xml:lang="ru">
 <subject>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">QUANTITATIVE DETERMINATION OF METHOXY AND HYDROXYETHOXY GROUPS IN HYDROXYETHYL METHYL CELLULOSE BY FTIR SPECTROSCOPY WITH CALIBRATION USING 13C NMR DATA</article-title>
 <trans-title-group xml:lang="ru">
 <trans-title>КОЛИЧЕСТВЕННОЕ ОПРЕДЕЛЕНИЕ МЕТОКСИ- И ГИДРОКСИЭТОКСИ-ГРУПП В ГИДРОКСИЭТИЛМЕТИЛЦЕЛЛЮЛОЗЕ МЕТОДОМ ИК-ФУРЬЕ-СПЕКТРОСКОПИИ С КАЛИБРОВКОЙ ПО ДАННЫМ ЯМР 13С СПЕКТРОСКОПИИ</trans-title>
 </trans-title-group>
 </title-group>
 <contrib-group>
 <contrib contrib-type="author">
 <contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1774-0836</contrib-id>
 <name-alternatives>
 <name xml:lang="en">
 <surname>Kostryukov</surname>
 <given-names>Sergey G.</given-names>
 </name>
 <name xml:lang="ru">
 <surname>Кострюков</surname>
 <given-names>Сергей Геннадьевич</given-names>
 </name>
 </name-alternatives>
 <email>kostryukov_sg@mail.ru</email>
 <xref ref-type="aff" rid="aff1">1</xref>
 </contrib>
 <contrib contrib-type="author">
 <name-alternatives>
 <name xml:lang="en">
 <surname>Faizrakhmanov</surname>
 <given-names>Shamil A.</given-names>
 </name>
 <name xml:lang="ru">
 <surname>Файзрахманов</surname>
 <given-names>Шамиль Анвярович</given-names>
 </name>
 </name-alternatives>
 <email>Sh.Faizrahmanov@yandex.ru</email>
 <xref ref-type="aff" rid="aff2">2</xref>
 </contrib>
 </contrib-group>
 <aff-alternatives id="aff1">
 <aff xml:lang="ru">
 <institution>Национальный исследовательский Мордовский государственный университет им. Н.П. Огарёва; г. Саранск</institution>
 </aff>
 <aff xml:lang="en">
 <institution>National Research Ogarev Mordovia State University; Saransk</institution>
 </aff>
 </aff-alternatives>
 <aff-alternatives id="aff2">
 <aff xml:lang="ru">
 <institution>Национальный исследовательский Мордовский государственный университет, г. Саранск</institution>
 </aff>
 <aff xml:lang="en">
 <institution>National Research Ogarev Mordovia State University</institution>
 </aff>
 </aff-alternatives>
 <pub-date date-type="pub" iso-8601-date="2026-06-23" publication-format="electronic">
 <day>23</day>
 <month>06</month>
 <year>2026</year>
 </pub-date>
 <issue>2</issue>
 <issue-title xml:lang="en">NO2 (2026)</issue-title>
 <issue-title xml:lang="ru">№2 (2026)</issue-title>
 <fpage>29</fpage>
 <lpage>37</lpage>
 <history>
 <date date-type="received" iso-8601-date="2026-07-22">
 <day>22</day>
 <month>07</month>
 <year>2026</year>
 </date>
 </history>
 <permissions>
 <copyright-statement xml:lang="ru">Copyright ©; 2026, Вестник Донецкого университета. Серия 01. Естественные науки</copyright-statement>
 <copyright-statement xml:lang="en">Copyright ©; 2026, Vestnik of Donetsk University. Series 01. Natural Sciences</copyright-statement>
 <copyright-year>2026</copyright-year>
 <copyright-holder xml:lang="ru">Вестник Донецкого университета. Серия 01. Естественные науки</copyright-holder>
 <copyright-holder xml:lang="en">Vestnik of Donetsk University. Series 01. Natural Sciences</copyright-holder>
 <license license-type="open-access" ns0:href="https://creativecommons.org/licenses/by-nc/4.0/" xml:lang="ru">
 <license-p>Эта статья распространяется на условиях лицензии Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)</license-p>
 </license>
 <license license-type="open-access" ns0:href="https://creativecommons.org/licenses/by-nc/4.0/" xml:lang="en">
 <license-p>This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0)</license-p>
 </license>
 <ali:free_to_read />
 </permissions>
 <self-uri ns0:href="https://dongu-vestnik01.ru/index.php/bdsa/article/view/525">https://dongu-vestnik01.ru/index.php/bdsa/article/view/525</self-uri>
 <abstract xml:lang="en">
 <p>A method for the quantitative determination of methoxy and hydroxyethoxy groups in hydroxyethyl methyl cellulose (HEMC) by FTIR spectroscopy with calibration using 13C NMR data was developed. Nine commercial HEMC samples were studied. Linear regression relationships between the relative intensities of the 1373 cm–1 (CH3 deformation) and 1312 cm–1 (CH2CH2OH deformation) bands and the substituent content were established. The best results were obtained with normalization to the 949 cm–1 band (pyranose ring skeletal vibrations): for methoxy groups R2 = 0.9515, RMSE = 0.284 %; for hydroxyethoxy groups R2 = 0.825, RMSE = 0.98 %. Validation on three independent samples showed deviations from the reference 13C NMR values not exceeding 1.8 % for methoxy and 0.7% for hydroxyethoxy groups, which is acceptable for screening tasks. The proposed rapid method can be used for incoming raw material control.</p>
 </abstract>
 <trans-abstract xml:lang="ru">
 <p>Разработана методика количественного определения метокси- и гидроксиэтокси-групп в гидроксиэтилметилцеллюлозе (ГЭМЦ) методом ИК-Фурье-спектроскопии с калибровкой по данным ЯМР 13С спектроскопии. Исследовано 9 коммерческих образцов ГЭМЦ. Построены линейные регрессионные зависимости относительных интенсивностей полос 1373 см–1 (деформационные колебания CH3) и 1312 см–1 (деформационные колебания CH2CH2OH) от содержания заместителей. Лучшие результаты получены при нормировке на полосу 949 см–1 (скелетные колебания пиранозного цикла): для метокси-групп R2 = 0,9515, RMSE = 0,284 %; для гидроксиэтокси-групп R2 = 0,825, RMSE = 0,98 %. Валидация на трёх независимых образцах показала расхождение с референсными значениями, определенными из данных ЯМР 13С спектров не более 1,8 % для метокси- и 0,7 % для гидроксиэтокси-групп, что приемлемо для скрининговых задач. Предложенный экспресс-метод может быть использован для входного контроля сырья.</p>
 </trans-abstract>
 <kwd-group xml:lang="en">
 <kwd>hydroxyethyl methyl cellulose</kwd>
 <kwd>FTIR spectroscopy</kwd>
 <kwd>13C NMR</kwd>
 <kwd>methoxy groups</kwd>
 <kwd>hydroxyethoxy groups</kwd>
 <kwd>quantitative analysis</kwd>
 <kwd>calibration</kwd>
 </kwd-group>
 <kwd-group xml:lang="ru">
 <kwd>гидроксиэтилметилцеллюлоза</kwd>
 <kwd>степень замещения</kwd>
 <kwd>молярное замещение</kwd>
 <kwd>ИК-Фурье спектроскопия</kwd>
 <kwd>ЯМР 13С спектроскопия</kwd>
 <kwd>метокси-группы</kwd>
 <kwd>гидроксиэтокси-группы</kwd>
 <kwd>количественный анализ</kwd>
 <kwd>калибровка</kwd>
 </kwd-group>
 </article-meta>
 </front>
 <body>
 <p>[Полный текст статьи отсутствует в исходных данных. Необходимо добавить текст из PDF или другого источника.]</p>
 </body>
 <back>
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