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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">dan</journal-id><journal-title-group><journal-title xml:lang="ru">Доклады Национальной академии наук Беларуси</journal-title><trans-title-group xml:lang="en"><trans-title>Doklady of the National Academy of Sciences of Belarus</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1561-8323</issn><issn pub-type="epub">2524-2431</issn><publisher><publisher-name>The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.29235/1561-8323-2021-65-3-290-302</article-id><article-id custom-type="elpub" pub-id-type="custom">dan-974</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>ХИМИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>CHEMISTRY</subject></subj-group></article-categories><title-group><article-title>Новые иммуноаналитические системы на основе рекомбинантного лактоферрина человека</article-title><trans-title-group xml:lang="en"><trans-title>New immunoassay systems based on recombinant human lactoferrin</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Семенов</surname><given-names>Д. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Semenov</surname><given-names>D. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Семенов Дмитрий Александрович – науч. сотрудник</p><p>ул. Купревича, 5/2, 220141, Минск, Республика Беларусь</p></bio><bio xml:lang="en"><p>Semenov Dmitry A. – Researcher</p><p>5/2, Kuprevich Str., 220141, Minsk, Republic of Belarus</p></bio><email xlink:type="simple">dsemenov@iboch.by</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Вашкевич</surname><given-names>И. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Vashkevich</surname><given-names>I. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Вашкевич Ирина Игнатьевна – канд. хим. наук, вед. науч. сотрудник</p><p>ул. Купревича, 5/2, 220141, Минск, Республика Беларусь</p></bio><bio xml:lang="en"><p>Vashkevich Irina I. – Ph. D. (Chemistry), Leading researcher</p><p>5/2, Kuprevich Str., 220141, Minsk, Republic of Belarus</p></bio><email xlink:type="simple">vashkevich@iboch.by</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Свиридов</surname><given-names>О. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Sviridov</surname><given-names>O. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Свиридов Олег Васильевич – д-р хим. наук, заведующий лабораторией</p><p>ул. Купревича, 5/2, 220141, Минск, Республика Беларусь</p></bio><bio xml:lang="en"><p>Sviridov Oleg V. – D. Sc. (Chemistry), Head of the Laboratory</p><p>5/2, Kuprevich Str., 220141, Minsk, Republic of Belarus</p></bio><email xlink:type="simple">sviridov@iboch.by</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт биоорганической химии Национальной академии наук Беларуси</institution></aff><aff xml:lang="en"><institution>Institute of Bioorganic Chemistry of the National Academy of Sciences of Belarus</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>15</day><month>07</month><year>2021</year></pub-date><volume>65</volume><issue>3</issue><fpage>290</fpage><lpage>302</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Семенов Д.А., Вашкевич И.И., Свиридов О.В., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Семенов Д.А., Вашкевич И.И., Свиридов О.В.</copyright-holder><copyright-holder xml:lang="en">Semenov D.A., Vashkevich I.I., Sviridov O.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://doklady.belnauka.by/jour/article/view/974">https://doklady.belnauka.by/jour/article/view/974</self-uri><abstract><p>Комбинацией биохимических и синтетических методов с использованием рекомбинантного лактоферрина человека (рчЛФ) в качестве исходного соединения получены растворимые и иммобилизованные на твердой фазе иммунореагенты, включающие рчЛФ, комплекс рчЛФ с ионами европия, кроличью антисыворотку к рчЛФ, выделенный из антисыворотки антиген-аффинной хроматографией анти-рчЛФ иммуноглобулин, конъюгаты этого иммуноглобулина с хелатом Eu3+ или с пероксидазой из корней хрена. Биоспецифические взаимодействия реагентов в четырех иммунохимических системах различных конструкций изучены путем измерения ферментативной активности или флуоресценции с разрешением во времени. Практическим результатом исследования стала разработка тест-систем для быстрого и точного определения концентрации биологически активного рчЛФ в молоке трансгенных коз, во фракциях производственного процесса очистки этого белка, а также в фармацевтических препаратах и биологически активных пищевых добавках.</p></abstract><trans-abstract xml:lang="en"><p>In this work, soluble and solid phase immunoreagents, including recombinant human lactoferrin (rhLF), a complex of rhLF with europium ions, rabbit antiserum to rhLF, anti-rhLF immunoglobulin purified by antigen-affinity chromatography and the conjugates of this immunoglobulin with an Eu3+ chelate or horseradish peroxidase have been obtained by a combination of biochemical and synthetic methods using rhLF as an initial compound. Biospecific interactions of the reagents in four immunochemical systems were assessed by measuring the enzyme activity or time-resolved fluorescence. The study resulted in the development of fast and precise immunoassays for biologically active rhLF in transgenic goat milk and in protein fractions obtained in the course of pure rhLF manufacture, as well as in pharmaceutical preparations and food additives.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>лактоферрин человека</kwd><kwd>иммунореагенты на лактоферрин</kwd><kwd>иммуноанализ лактоферрина</kwd></kwd-group><kwd-group xml:lang="en"><kwd>recombinant human lactoferrin</kwd><kwd>lactoferrin immunoreagents</kwd><kwd>lactoferrin immunoassay</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">Isolation of an iron-containing red protein from human milk / B. 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