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<article 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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="other" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Russian Journal of Inorganic Chemistry</journal-id><journal-title-group><journal-title xml:lang="en">Russian Journal of Inorganic Chemistry</journal-title><trans-title-group xml:lang="ru"><trans-title>Журнал неорганической химии</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0044-457X</issn><issn publication-format="electronic">3034-560X</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">665290</article-id><article-id pub-id-type="doi">10.31857/S0044457X22700167</article-id><article-id pub-id-type="edn">JFWMYN</article-id><article-categories><subj-group subj-group-type="toc-heading"><subject>ФИЗИКОХИМИЯ РАСТВОРОВ</subject></subj-group><subj-group subj-group-type="article-type"><subject>Unknown</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Mixed Ligand Zinc Complexation with Ornithine and Histidine in Aqueous Solution</article-title><trans-title-group xml:lang="ru"><trans-title>Смешанолигандное комплексообразование цинка с орнитином и гистидином в водном растворе</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Nikitina</surname><given-names>M. G.</given-names></name><name xml:lang="ru"><surname>Никитина</surname><given-names>М. Г.</given-names></name></name-alternatives><email>pyreu@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Gruzdev</surname><given-names>M. S.</given-names></name><name xml:lang="ru"><surname>Груздев</surname><given-names>М. С.</given-names></name></name-alternatives><email>pyreu@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Pyreu</surname><given-names>D. F.</given-names></name><name xml:lang="ru"><surname>Пырэу</surname><given-names>Д. Ф.</given-names></name></name-alternatives><email>pyreu@mail.ru</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Krestov Institute of Solution Chemistry, Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт химии растворов им. Г.А. Крестова РАН</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Ivanovo State University</institution></aff><aff><institution xml:lang="ru">Ивановский государственный университет</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-03-01" publication-format="electronic"><day>01</day><month>03</month><year>2023</year></pub-date><volume>68</volume><issue>3</issue><fpage>363</fpage><lpage>372</lpage><history><date date-type="received" iso-8601-date="2025-02-26"><day>26</day><month>02</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, М.Г. Никитина, М.С. Груздев, Д.Ф. Пырэу</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, М.Г. Никитина, М.С. Груздев, Д.Ф. Пырэу</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">М.Г. Никитина, М.С. Груздев, Д.Ф. Пырэу</copyright-holder><copyright-holder xml:lang="ru">М.Г. Никитина, М.С. Груздев, Д.Ф. Пырэу</copyright-holder></permissions><self-uri xlink:href="https://transsyst.ru/0044-457X/article/view/665290">https://transsyst.ru/0044-457X/article/view/665290</self-uri><abstract xml:lang="en"><p>The formation of mixed-ligand complexes of various compositions in the Zn–L-histidine (His)–L-ornithine (Orn) system has been studied by pH-metry, calorimetry, and NMR spectroscopy. The thermodynamic parameters (log K, ΔrG0 ΔrH, ΔrS) of the reactions of their formation at 298.15 K and ionic strength I = 0.5 (KNO3) have been calculated. Based on the comparative analysis of thermodynamic parameters, the most probable method for the coordination of amino acid residues in mixed complexes has been proposed.</p></abstract><trans-abstract xml:lang="ru"><p id="idm45181324219008">Методами pH-метрии, калориметрии и ЯМР-спектроскопии изучено образование смешанолигандных комплексов различного состава в системе Zn–L-гистидин (His)–L-орнитин (Orn). Рассчитаны термодинамические параметры (lg <italic>K</italic>, Δ<italic><sub>r</sub>G</italic><sup>0</sup> Δ<italic><sub>r</sub>H</italic>, Δ<italic><sub>r</sub>S</italic>) реакций их образования при 298.15 K и ионной силе <italic>I</italic> = 0.5 (KNO<sub>3</sub>). На основании проведенного сравнительного анализа термодинамических параметров предложен наиболее вероятный способ координации аминокислотных остатков в составе смешанных комплексов.</p></trans-abstract><kwd-group xml:lang="en"><kwd>mixed ligand complexation</kwd><kwd>histidine</kwd><kwd>ornithine</kwd><kwd>calorimetry</kwd><kwd>zinc</kwd><kwd>denticity</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>смешанолигандное комплексообразование</kwd><kwd>гистидин</kwd><kwd>орнитин</kwd><kwd>калориметрия</kwd><kwd>цинк</kwd><kwd>дентатность</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Yamauchi O., Odani A. // J. Chem. Soc., Dalton Trans. 2002. P. 3411. https://doi.org/10.1039/B202385G</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Yamauchi O., Odani A. // Inorg. Chim. Acta. 1985. V. 100. 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