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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">pharmjournal</journal-id><journal-title-group><journal-title xml:lang="ru">Разработка и регистрация лекарственных средств</journal-title><trans-title-group xml:lang="en"><trans-title>Drug development &amp; registration</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2305-2066</issn><issn pub-type="epub">2658-5049</issn><publisher><publisher-name>LLC «CPHA»</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.33380/2305-2066-2023-12-1-227-236</article-id><article-id custom-type="elpub" pub-id-type="custom">pharmjournal-1453</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>РЕГУЛЯТОРНЫЕ ВОПРОСЫ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>REGULATORY ISSUES</subject></subj-group></article-categories><title-group><article-title>Об аналитических и технологических причинах результатов Out-of-Specification для тестов количественное определение и растворение (обзор)</article-title><trans-title-group xml:lang="en"><trans-title>About Analytical and Technological Reasons of Out-of-Specification Results for Assay and Disolution Tests (Review)</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8047-4078</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Эпштейн</surname><given-names>Н. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Epshtein</surname><given-names>N. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>115446, г. Москва, Коломенский проезд, 13А</p></bio><bio xml:lang="en"><p>13A, Kolomensky passage, Moscow, 115446</p></bio><email xlink:type="simple">naumepshtein@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Центр регистрации и разработки лекарственных средств ООО «ИРВИН 2»</institution></aff><aff xml:lang="en"><institution>Center of registration and development of medicines LLC «IRVIN 2»</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>28</day><month>02</month><year>2023</year></pub-date><volume>12</volume><issue>1</issue><fpage>227</fpage><lpage>236</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Эпштейн Н.А., 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">Эпштейн Н.А.</copyright-holder><copyright-holder xml:lang="en">Epshtein N.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://www.pharmjournal.ru/jour/article/view/1453">https://www.pharmjournal.ru/jour/article/view/1453</self-uri><abstract><sec><title>Введение</title><p>Введение. Результаты вне спецификации (OOS results) представляют собой серьезную проблему при разработке, валидации и использовании методик «Количественное определение» и «Растворение». Тема актуальная, что подтверждается данными поиска в Internet по фразе «Out-of-Specification» + «HPLC» – найдено около 35 300 результатов.</p></sec><sec><title>Текст</title><p>Текст. Рассмотрены и систематизированы в виде сводной таблицы важные для практики аналитические и технологические причины (факторы), которые могут приводить к получению заниженных или завышенных результатов анализов. Речь идет о следующих факторах. Факторы, связанные с расчетной формулой. Факторы, связанные с подготовкой проб (образцов). Факторы, связанные с растворителем образца и соотношением pH раствора образца и подвижной фазы. Факторы, связанные с хроматограммами и их обработкой. Основные технологические факторы.</p></sec><sec><title>Заключение</title><p>Заключение. Представлены данные и рекомендации для поиска аналитических и технологических причин получения результатов Out-of-Specification в случае тестов «Количественное определение» и «Растворение».</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Introduction</title><p>Introduction. Out of specification (OOS) results represent a major challenge in the development, validation and use of the Assay and Dissolution methods. The topic is relevant, which is confirmed by Internet search data for the phrase "Out-of-Specification" + "HPLC" – about 35,300 results were found.</p></sec><sec><title>Text</title><p>Text. The analytical and technological reasons (factors) that can lead to underestimated or overestimated test results are considered and systematized in the form of a summary table important for practice. These are the following factors. Factors associated with the calculation formula. Factors related to the preparation of samples. Factors related to the sample solvent and ratio of the pH the sample solution and the mobile phase. Factors associated with chromatograms and their processing. The main technological factors.</p></sec><sec><title>Conclusion</title><p>Conclusion. Data and recommendations are presented to search for analytical and technological reasons for obtaining Out-of-Specification results in the case of tests Assay and Dissolution.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>Out-of-Specification</kwd><kwd>причины</kwd><kwd>аналитические и технологические факторы</kwd><kwd>тест «Количественное определение»</kwd><kwd>тест «Растворение»</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Out-of-Specification</kwd><kwd>reasons</kwd><kwd>analytical and technological factors</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">Guidance for Industry. 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