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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">medlit</journal-id><journal-title-group><journal-title xml:lang="ru">Гигиена и санитария</journal-title><trans-title-group xml:lang="en"><trans-title>Hygiene and Sanitation</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0016-9900</issn><issn pub-type="epub">2412-0650</issn><publisher><publisher-name>Federal Scientific Center of Hygiene named after F.F. Erisman</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.47470/0016-9900-2021-100-8-869-874</article-id><article-id custom-type="elpub" pub-id-type="custom">medlit-1637</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>ПРОФИЛАКТИЧЕСКАЯ ТОКСИКОЛОГИЯ И ГИГИЕНИЧЕСКОЕ НОРМИРОВАНИЕ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>PREVENTIVE TOXICOLOGY AND HYGIENIC STANDARTIZATION</subject></subj-group></article-categories><title-group><article-title>Оптимизация условий этерификации тиодиуксусной кислоты в моче с помощью математического планирования для проведения биологического мониторинга</article-title><trans-title-group xml:lang="en"><trans-title>Optimization of conditions for esterification of thiodiacetic acid in urine using mathematical planning for biological monitoring</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-9961-6408</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Журба</surname><given-names>О. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Zhurba</surname><given-names>Olga M.</given-names></name></name-alternatives><email xlink:type="simple">noemail@neicon.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-4980-5304</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Алексеенко</surname><given-names>Антон Николаевич</given-names></name><name name-style="western" xml:lang="en"><surname>Alekseenko</surname><given-names>Anton N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Канд. хим. наук, ст. науч. сотр. лаб. аналитической экотоксикологии и биомониторинга, ФГБНУ «Восточно-Сибирский институт медико-экологических исследований», 665827, Ангарск.</p><p>e-mail: alexeenko85@mail.ru</p></bio><bio xml:lang="en"><p>MD, PhD, senior research fellow, Laboratory of analytical ecotoxicology and biomonitoring of the East-Siberian Institution ofMedical and Ecological Research, Angarsk, 665827, Russian Federation.</p><p>e-mail: alexeenko85@mail.ru </p></bio><email xlink:type="simple">alexeenko85@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8740-3133</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Шаяхметов</surname><given-names>С. Ф.</given-names></name><name name-style="western" xml:lang="en"><surname>Shayakhmetov</surname><given-names>Salim F.</given-names></name></name-alternatives><email xlink:type="simple">noemail@neicon.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ФГБНУ «Восточно-Сибирский институт медико-экологических исследований»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>East-Siberian Institute of Medical and Ecological Research</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>31</day><month>08</month><year>2021</year></pub-date><volume>100</volume><issue>8</issue><fpage>869</fpage><lpage>874</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Журба О.М., Алексеенко А.Н., Шаяхметов С.Ф., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Журба О.М., Алексеенко А.Н., Шаяхметов С.Ф.</copyright-holder><copyright-holder xml:lang="en">Zhurba O.M., Alekseenko A.N., Shayakhmetov S.F.</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.rjhas.ru/jour/article/view/1637">https://www.rjhas.ru/jour/article/view/1637</self-uri><abstract><sec><title>Введение</title><p>Введение. Для оценки воздействия токсикантов винилхлорида (ВХ) и 1,2-дихлорэтана (ДХЭ) на человека наибольшее значение имеет персонализированный биомониторинг тиодиуксусной кислоты (ТДУК). Определение ТДУК в моче проводили с помощью метода газовой хромато-масс-спектрометрии (ГХ-МС).</p></sec><sec><title>Материалы и методы</title><p>Материалы и методы. Пробоподготовка заключается в этерификации аналита в биологической матрице метиловым спиртом (с 10% трифторида бора), извлечении производного жидкостной экстракцией этилацетатом. В работе использовали газовый хроматограф Agilent 7890A с капиллярной колонкой HP-5MS и масс-селективным детектором. Идентифицировали ТДУК в виде сложного диметилового эфира на масс-хроматограмме по времени удерживания и соотношению интенсивностей регистрируемых ионов.</p></sec><sec><title>Результаты</title><p>Результаты. С целью определения рациональных параметров процесса пробоподготовки для определения ТДУК в моче были проведены исследования в соответствии с методом планирования эксперимента, позволяющим получить наиболее точное математическое описание процессов. Оптимизацию условий этерификации ТДУК осуществляли с помощью математического планирования, варьируя температуру, время процесса, природу катализатора (BF3 и H2SO4). Матрица планирования включала в себя восемь опытов, в качестве параметра оптимизации служила степень конверсии ТДУК. Интерпретация модели показала, что температура вносит больший вклад в формирование степени конверсии, чем время процесса, а природа катализатора не оказывает влияние на степень конверсии.</p></sec><sec><title>Заключение</title><p>Заключение. Разработана математическая модель оптимизации условий пробоподготовки биомаркера экспозиции ВХ (ТДУК) в моче, показывающая вклад 3 факторов (температуру реакции, время реакции, природу катализатора) в степень конверсии, из которых наибольший вклад в выборе оптимальных условий этерификации вносит температура реакции. Природа катализатора (BF3 и H2SO4) не оказывает влияние на степень конверсии.</p></sec><sec><title>Участие авторов</title><p>Участие авторов: </p></sec><sec><title>Журба О</title><p>Журба О.М. – концепция и дизайн исследования, написание текста, проведение исследований с применением газовой хромато-масс-спектрометрии, утверждение окончательного варианта статьи;</p></sec><sec><title>Алексеенко А</title><p>Алексеенко А.Н. ‒ редактирование, обсуждение результатов, проведение аналитических исследований с применением газовой хромато-масс-спектрометрии, написание текста;</p></sec><sec><title>Шаяхметов С</title><p>Шаяхметов С.Ф. – организация исследований, обоснование программы исследований, редактирование, ответственность за целостность всех частей статьи.</p></sec><sec><title>Конфликт интересов</title><p>Конфликт интересов. Авторы декларируют отсутствие явных и потенциальных конфликтов интересов в связи с публикацией данной статьи.</p></sec><sec><title>Финансирование</title><p>Финансирование. Работа выполнена в рамках средств, выделяемых для выполнения государственного задания ФГБНУ ВСИМЭИ.</p></sec><sec><title> </title><p> </p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Introduction</title><p>Introduction. To assess the impact of the toxicants vinyl chloride (VC) and 1,2-dichloroethane (DCE) on humans, personalized biomonitoring of thiodiacetic acid (TDAA) is of most significant importance. Determination of TDAA in urine was carried out using the method of gas chromatography-mass spectrometry GC-MS.</p></sec><sec><title>Materials and methods</title><p>Materials and methods. Sample preparation consists of the analyte’s esterification in a biological matrix with methyl alcohol (with 10% boron trifluoride), extraction of the derivative by liquid extraction with ethyl acetate. We used an Agilent 7890A gas chromatograph with an HP-5MS capillary column and a mass-selective detector. TDAA was identified in the form of a dimethyl ester on a mass chromatogram according to the retention time and the ratio of the intensities of the registered ions.</p></sec><sec><title>Results</title><p>Results. To determine the rational parameters of the sample preparation process for the determination of TDAA in urine studies were carried out under the method of planning the experiment, which makes it possible to obtain the most accurate mathematical description of the processes. Optimization of the conditions for esterification of TDAA was carried out using mathematical planning, varying the temperature, process time, and the nature of the catalyst (BF3 or H2SO4). The scheduling matrix included eight experiments; the degree of conversion of TDAA served as an optimization parameter. Interpretation of the model showed that temperature makes more contribution to the formation of the degree of conversion than the processing time. The nature of the catalyst does not affect the degree of conversion.</p></sec><sec><title>Conclusion</title><p>Conclusion. A mathematical model developed for optimizing the conditions for sample preparation of the biomarker of exposure to VC (TDАА) in urine, showed the contribution of three factors (reaction temperature, reaction time, catalyst nature) to the conversion rate, of which the reaction temperature makes the greatest contribution to the choice of optimal esterification conditions. The nature of the catalyst (BF3 or H2SO4) does not affect the conversion rate.</p></sec><sec><title>Contribution</title><p>Contribution: </p></sec><sec><title>Zhurba O</title><p>Zhurba O.M. — the concept and design of the study, writing a text, approval of the final version of the article, analytical studies using gas chromatography-mass spectrometry;</p></sec><sec><title>Alekseenko A</title><p>Alekseenko A.N. — editing, discussion of the results, analytical studies using gas chromatography-mass spectrometry; writing a text;</p></sec><sec><title>Shayakhmetov S</title><p>Shayakhmetov S.F. — organization of research, justification of the research program, editing, responsibility for the integrity of all parts of the article. </p></sec><sec><title>Conflict of interest</title><p>Conflict of interest. The authors declare no conflict of interest.</p></sec><sec><title>Acknowledgement</title><p>Acknowledgement. Financing of the work was carried out at the expense of funds allocated for the state assignment of the East-Siberian Institute of Medical and Ecological Research.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>винилхлорид</kwd><kwd>производство поливинилхлорида</kwd><kwd>метаболиты</kwd><kwd>тиодиуксусная кислота</kwd><kwd>биологические среды</kwd><kwd>газовая хромато-масс-спектрометрия</kwd><kwd>математическое планирование</kwd><kwd>оптимальные условия</kwd></kwd-group><kwd-group xml:lang="en"><kwd>vinyl chloride</kwd><kwd>PVC production</kwd><kwd>metabolites</kwd><kwd>thiodiacetic acid</kwd><kwd>biological fluids</kwd><kwd>gas chromatography-mass spectrometry</kwd><kwd>mathematical planning</kwd><kwd>optimal conditions</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">Малышева А.Г., Козлова Н.Ю., Юдин С.М. 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