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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="en"><front><journal-meta><journal-id journal-id-type="publisher-id">foodsyst</journal-id><journal-title-group><journal-title xml:lang="en">Food systems</journal-title><trans-title-group xml:lang="ru"><trans-title>Пищевые системы</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2618-9771</issn><issn pub-type="epub">2618-7272</issn><publisher><publisher-name>Федеральный научный центр пищевых систем им. В.М. Горбатова РАН</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.21323/2618-9771-2021-4-4-239-245</article-id><article-id custom-type="elpub" pub-id-type="custom">foodsyst-131</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>Статьи</subject></subj-group></article-categories><title-group><article-title>Establishment of metrological parameters of the method for measuring the protein mass fraction in fish food products by the Kjeldahl method</article-title><trans-title-group xml:lang="ru"><trans-title>Установление метрологических параметров методики измерений массовой доли белка методом Кьельдаля в пищевой рыбной продукции</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8507-3548</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Козин</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Kozin</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Козин Андрей Валерьевич — кандидат химических наук, старший научный сотрудник, Отдел Качества пищевой рыбной продукции</p><p>107140, Москва, ул. Верхняя Красносельская, 17Тел. +7–916–102–93–87</p></bio><bio xml:lang="en"><p>Andrey V. Kozin, Сandidate of chemical sciences, Senior Researcher, Fish Food Quality Department</p><p>Verkhnyaya Krasnoselskaya Street, 17, 107140, MoscowTel.: +7–916–102–93–87</p></bio><email xlink:type="simple">kozin82a@vniro.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/0000-0001-8278-2760</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Абрамова</surname><given-names>Л. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Abramova</surname><given-names>L. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Абрамова Любовь Сергеевна — доктор технических наук, профессор, заместитель руководителя департамента по вопросам качества пищевой рыбной продукции</p><p>107140, Москва, ул. Верхняя Красносельская, 17Тел. +7–915–064–77–04</p></bio><bio xml:lang="en"><p>Liubov S. Abramova, Doctor of technical sciences, professor, Deputy Head of the Department for the Quality of Fish Food Products</p><p>Verkhnyaya Krasnoselskaya Street, 17, 107140, MoscowTel.: +7–915–064–77–04</p></bio><email xlink:type="simple">abramova@vniro.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/0000-0002-1377-1838</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Гусева</surname><given-names>Е. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Guseva</surname><given-names>E. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Гусева Елена Сергеевна — специалист, Отдел Качества пищевой рыбной продукции</p><p>107140, Москва, ул. Верхняя Красносельская, 17Тел.: +7–917–505–92–06</p></bio><bio xml:lang="en"><p>Elena S. Guseva, specialist, Fish Food Quality Department</p><p>Verkhnyaya Krasnoselskaya Street, 17, 107140, MoscowTel.: +7–917–505–92–06</p></bio><email xlink:type="simple">quality@vniro.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/0000-0001-7931-2602</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Дерунец</surname><given-names>И. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Derunets</surname><given-names>I. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Дерунец Илья Вадимович — специалист, Отдел Качества пищевой рыбной продукции</p><p>107140, Москва, ул. Верхняя Красносельская, 17Тел.: +7–985–745–70–29</p></bio><bio xml:lang="en"><p>Ilya V. Derunets, specialist, Fish Food Quality Department</p><p>Verkhnyaya Krasnoselskaya Street, 17, 107140, MoscowTel.: +7–985–745–70–29</p></bio><email xlink:type="simple">quality@vniro.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Всероссийский научно-исследовательский институт рыбного хозяйства и океанографии</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Russian Federal Research Institute of Fisheries and Oceanography («VNIRO»)</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>05</day><month>01</month><year>2022</year></pub-date><volume>4</volume><issue>4</issue><fpage>239</fpage><lpage>245</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Kozin A.V., Abramova L.S., Guseva E.S., Derunets I.V., 2022</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="ru">Козин А.В., Абрамова Л.С., Гусева Е.С., Дерунец И.В.</copyright-holder><copyright-holder xml:lang="en">Kozin A.V., Abramova L.S., Guseva E.S., Derunets I.V.</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.fsjour.com/jour/article/view/131">https://www.fsjour.com/jour/article/view/131</self-uri><abstract><p>In laboratory practice, there are many protein quantification methods, and all of them have their own advantages and disadvantages. The most common and widely used method for the protein analysis in food products, including fish, is the Kjeldahl method. However, the current standards for measurement methods for the determination of the protein content in fish food products do not provide for the use of devices that meet the modern level of technical development, and also do not contain metrological indicators that guarantee the reliability of the results obtained. The aim of the study was to substantiate the method for measuring the protein mass fraction in fish food products by the Kjeldahl method on an automatic analyzer and to establish metrological parameters. The assessment of the quality indicators of the Kjeldahl measuring method was carried out using a Kjeltec System 2300 Nitrogen Analyzer (Foss Analytical AB, Sweden) in the form of a characteristic of the measurement error and its components, which will provide results with the required accuracy.</p></abstract><trans-abstract xml:lang="ru"><p>В лабораторной практике существует множество методов определения количества белка и все они имеют свои преимущества и недостатки. Наиболее распространенным и широко используемым методом анализа белка в пищевой продукции, в том числе рыбной, является метод Кьельдаля. Однако при определении содержания белка в пищевой рыбной продукции действующие стандарты на методы измерений не предусматривают использование приборов, отвечающих современному уровню технического развития, а также не содержат метрологические показатели, гарантирующие достоверность полученных результатов. Целью исследования являлось обоснование методики измерений массовой доли белка методом Кьельдаля на автоматическом анализаторе и установление метрологических параметров. Проведена оценка показателей качества методики измерений методом Кьельдаля с использованием анализатора азота Kjeltec System 2300 (Foss Analytical AB, Sweden) в виде характеристики погрешности измерений и ее составляющих, что позволит получать результаты с заданной точностью.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>аналитический метод</kwd><kwd>азот</kwd><kwd>автоматический анализатор</kwd><kwd>контроль качества</kwd><kwd>подготовка образцов</kwd><kwd>отбор проб</kwd><kwd>приборы</kwd></kwd-group><kwd-group xml:lang="en"><kwd>analytical method</kwd><kwd>nitrogen</kwd><kwd>automatic analyzer</kwd><kwd>quality control</kwd><kwd>sample preparation</kwd><kwd>sampling</kwd><kwd>instruments</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Авторы выражают благодарность заместителю главного врача Гарбузовой А. А., инженеру С. А. Мокренской и инженеру М. М. Дудареву ФБУЗ ФЦГиЭ Роспотребнадзора за помощь в проведении работ по установлению метрологических параметров и аттестации методики измерений массовой доли белка методом Кьельдаля.</funding-statement><funding-statement xml:lang="en">The authors wish to thank deputy chief medical officer Garbuzova A. A., engineer Mokrenskaya S. A. and engineer Dudarev M. M. (FBHI FCH&amp;E of the Inspectorate for Customers Protection) for their help in carrying out the work on the establishment of metrological parameters and certification of the method for measuring the protein mass fraction by the Kjeldahl method.</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">Lu, Y., Xia, Y., Liu, G., Pan, M., Li, M., Lee, N. A., Wang, S. (2017). A review of methods for detecting melamine in food samples. 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