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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">najo</journal-id><journal-title-group><journal-title xml:lang="en">Nanosystems: Physics, Chemistry, Mathematics</journal-title><trans-title-group xml:lang="ru"><trans-title>Наносистемы: физика, химия, математика</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2220-8054</issn><issn pub-type="epub">2305-7971</issn><publisher><publisher-name>Университет ИТМО</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.17586/2220-8054-2020-11-3-324-332</article-id><article-id custom-type="elpub" pub-id-type="custom">najo-429</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="en"><subject>CHEMISTRY AND MATERIALS SCIENCE</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ХИМИЯ И НАУКА О МАТЕРИАЛАХ</subject></subj-group></article-categories><title-group><article-title>CeO2 nanoparticles as free radical regulators in biological systems</article-title><trans-title-group xml:lang="ru"><trans-title></trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Sozarukova</surname><given-names>M. M.</given-names></name></name-alternatives><email xlink:type="simple">s_madinam@bk.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Proskurnina</surname><given-names>E. V.</given-names></name></name-alternatives><bio xml:lang="en"><p>Moskvorechie St, 1, Moscow, 115522</p></bio><email xlink:type="simple">proskurnina@gmail.com</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Baranchikov</surname><given-names>A. E.</given-names></name></name-alternatives><email xlink:type="simple">a.baranchikov@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Ivanov</surname><given-names>V. K.</given-names></name></name-alternatives><email xlink:type="simple">van@igic.ras.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff xml:lang="en" id="aff-1"><institution>Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences</institution><country>Russian Federation</country></aff><aff xml:lang="en" id="aff-2"><institution>Research Centre for Medical Genetics</institution><country>Russian Federation</country></aff><pub-date pub-type="collection"><year>2020</year></pub-date><pub-date pub-type="epub"><day>30</day><month>07</month><year>2025</year></pub-date><volume>11</volume><issue>3</issue><elocation-id>324–332</elocation-id><permissions><copyright-statement>Copyright &amp;#x00A9; Sozarukova M.M., Proskurnina E.V., Baranchikov A.E., Ivanov V.K., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Sozarukova M.M., Proskurnina E.V., Baranchikov A.E., Ivanov V.K.</copyright-holder><copyright-holder xml:lang="en">Sozarukova M.M., Proskurnina E.V., Baranchikov A.E., Ivanov V.K.</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://nanojournal.ifmo.ru/jour/article/view/429">https://nanojournal.ifmo.ru/jour/article/view/429</self-uri><abstract><p>Cerium dioxide nanoparticles possess unique physical and chemical properties, among which the enzyme-like activity is of particular interest. In particular, they are able to perform the functions of pro- and antioxidant enzymes, such as superoxide dismutase (SOD), catalase, and peroxidase. Due to the advantages associated with pH and temperature stability and low cost, CeO2 nanoparticles can be considered as promising mimetics of these enzymes. In this paper, the antioxidant activity of a citrate-stabilized colloidal suspension of CeO2 nanoparticles has been studied using chemiluminometry in model systems generating superoxide anion radical and hydrogen peroxide. In the lucigenin/xanthine/xanthine oxidase system, generating a superoxide anion radical, CeO2 nanoparticles exhibit antioxidant properties increasing upon conjugation with SOD. When interacting with hydrogen peroxide, CeO2 nanoparticles exhibit peroxidase-like activity. In the combined ROS generating system, lucigenin/Co(II)/H2O2, CeO2 nanoparticles demonstrated prooxidant activity.</p></abstract><kwd-group xml:lang="en"><kwd>cerium dioxide nanoparticles</kwd><kwd>superoxide anion radical</kwd><kwd>hydrogen peroxide</kwd><kwd>nanozymes</kwd><kwd>superoxide dismutase</kwd><kwd>peroxidase</kwd><kwd>chemiluminescence</kwd></kwd-group><funding-group><funding-statement xml:lang="en">This work was supported by the Russian Science Foundation (project No. 19-13-00416).</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">Yadav N., Patel V., Singh S. Cerium Oxide-Based Nanozymes in Biology and Medicine. Springer Proceedings in Physics, 2018, 236, P. 193– 213.</mixed-citation><mixed-citation xml:lang="en">Yadav N., Patel V., Singh S. Cerium Oxide-Based Nanozymes in Biology and Medicine. 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