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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">10.17586/2220-8054-2019-10-2-184-189</article-id><article-id custom-type="elpub" pub-id-type="custom">najo-638</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>Humic acid-stabilized superparamagnetic maghemite nanoparticles: surface charge and embryotoxicity evaluation</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>Goldt</surname><given-names>A. E.</given-names></name></name-alternatives><bio xml:lang="en"><p>Moscow</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Polyakov</surname><given-names>A. Yu.</given-names></name></name-alternatives><bio xml:lang="en"><p>Moscow 119991</p></bio><email xlink:type="simple">a.yu.polyakov@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>Sorkina</surname><given-names>T. A.</given-names></name></name-alternatives><bio xml:lang="en"><p>Moscow</p></bio><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Dubov</surname><given-names>A. L.</given-names></name></name-alternatives><bio xml:lang="en"><p>Moscow 119991</p></bio><xref ref-type="aff" rid="aff-4"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Davidova</surname><given-names>G. A.</given-names></name></name-alternatives><bio xml:lang="en"><p>Pushchino 142290</p></bio><xref ref-type="aff" rid="aff-5"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Selezneva</surname><given-names>I. I.</given-names></name></name-alternatives><bio xml:lang="en"><p>Pushchino 142290</p></bio><xref ref-type="aff" rid="aff-5"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Maximov</surname><given-names>Y. V.</given-names></name></name-alternatives><bio xml:lang="en"><p>Moscow 119991</p></bio><xref ref-type="aff" rid="aff-6"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Presnyakov</surname><given-names>I. A.</given-names></name></name-alternatives><bio xml:lang="en"><p>Moscow 119991</p></bio><xref ref-type="aff" rid="aff-7"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Polyakova</surname><given-names>N. Yu.</given-names></name></name-alternatives><bio xml:lang="en"><p>Moscow</p></bio><xref ref-type="aff" rid="aff-8"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Goodilin</surname><given-names>E. A.</given-names></name></name-alternatives><bio xml:lang="en"><p>Moscow 119991</p></bio><xref ref-type="aff" rid="aff-9"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Perminova</surname><given-names>I. V.</given-names></name></name-alternatives><bio xml:lang="en"><p>Moscow 119991 </p></bio><xref ref-type="aff" rid="aff-7"/></contrib></contrib-group><aff xml:lang="en" id="aff-1"><institution>Skolkovo Institute of Science and Technology</institution><country>Russian Federation</country></aff><aff xml:lang="en" id="aff-2"><institution>Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences</institution><country>Russian Federation</country></aff><aff xml:lang="en" id="aff-3"><institution>Science &amp; Technology Department, Management Company RUSNANO, LLC</institution><country>Russian Federation</country></aff><aff xml:lang="en" id="aff-4"><institution>Department of Materials Science, Lomonosov Moscow State University ; Department of Chemistry, Lomonosov Moscow State University</institution><country>Russian Federation</country></aff><aff xml:lang="en" id="aff-5"><institution>Institute of Theoretical &amp; Experimental Biophysics of Russian Academy of Sciences</institution><country>Russian Federation</country></aff><aff xml:lang="en" id="aff-6"><institution>Semenov Institute of Chemical Physics of Russian Academy of Sciences</institution><country>Russian Federation</country></aff><aff xml:lang="en" id="aff-7"><institution>Department of Chemistry, Lomonosov Moscow State University</institution><country>Russian Federation</country></aff><aff xml:lang="en" id="aff-8"><institution>I. M. Sechenov First Moscow State Medical University of the Ministry of Health of the Russian Federation (Sechenov University)</institution><country>Russian Federation</country></aff><aff xml:lang="en" id="aff-9"><institution>Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences ; Department of Materials Science, Lomonosov Moscow State University ; Department of Chemistry, Lomonosov Moscow State University</institution><country>Russian Federation</country></aff><pub-date pub-type="collection"><year>2019</year></pub-date><pub-date pub-type="epub"><day>12</day><month>08</month><year>2025</year></pub-date><volume>10</volume><issue>2</issue><fpage>184</fpage><lpage>189</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Goldt A.E., Polyakov A.Y., Sorkina T.A., Dubov A.L., Davidova G.A., Selezneva I.I., Maximov Y.V., Presnyakov I.A., Polyakova N.Y., Goodilin E.A., Perminova I.V., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Goldt A.E., Polyakov A.Y., Sorkina T.A., Dubov A.L., Davidova G.A., Selezneva I.I., Maximov Y.V., Presnyakov I.A., Polyakova N.Y., Goodilin E.A., Perminova I.V.</copyright-holder><copyright-holder xml:lang="en">Goldt A.E., Polyakov A.Y., Sorkina T.A., Dubov A.L., Davidova G.A., Selezneva I.I., Maximov Y.V., Presnyakov I.A., Polyakova N.Y., Goodilin E.A., Perminova 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://nanojournal.ifmo.ru/jour/article/view/638">https://nanojournal.ifmo.ru/jour/article/view/638</self-uri><abstract><p>Superparamagnetic iron oxide γ-Fe2O3 (maghemite) nanoparticles (SPION) encapsulated into water-soluble microspheres of rock salt were synthesized via a new aerosol spray pyrolysis procedure. Humic acids (HA) were employed to stabilize the aqueous suspensions of γ-Fe2O3 nanoparticles released upon dissolution of the NaCl matrix. The effect of HA on the surface charge of maghemite-based colloids was studied in pH range of 3 – 10. Humic polyanions compensate positive charges on a hydrated γ-Fe2O3 surface resulting in strongly negative ζ-potential (&lt; −40 mV) of colloid even in acidic environment. In neutral and alkaline environment, ζ-potential of maghemite-based colloid drops below −55 mV; thus, HA should effectively stabilize the nanoparticle colloid over the whole pH range studied. Meanwhile, bare maghemite SPION at pH 3 – 6 have ζ-potential in the +20 mV to −20 mV range (isoelectric point at pH 4.35), which is insufficient for electrostatic stabilization of the suspensions. The absence of embryotoxicity of HA-stabilized nanoparticles was demonstrated.</p></abstract><kwd-group xml:lang="en"><kwd>small superparamagnetic iron oxide nanoparticles (SPION)</kwd><kwd>humic acids</kwd><kwd>magnetic fluids</kwd><kwd>colloidal properties</kwd><kwd>embryotoxicity</kwd><kwd>biomedicine</kwd></kwd-group><funding-group><funding-statement xml:lang="en">The work was carried out within the State Assignment on Fundamental Research to the Kurnakov Institute of General and Inorganic Chemistry.</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">Song C., Sun W., Xiao Y., Shi X. Ultrasmall iron oxide nanoparticles: synthesis, surface modification, assembly, and biomedical applications. Drug Discov. Today, 2019, 24 (3), P. 835–844.</mixed-citation><mixed-citation xml:lang="en">Song C., Sun W., Xiao Y., Shi X. 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