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In the first step, lactate oxidase (LOx) and pyruvate oxidase (POx) were separately immobilized on silanized magnetite nanoparticles (SiO\n                    <jats:sub>2<\/jats:sub>\n                    @Fe\n                    <jats:sub>3<\/jats:sub>\n                    O\n                    <jats:sub>4<\/jats:sub>\n                    NPs), and thus, 2\u00a0mol of H\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    was released per 1\u00a0mol of the substrate due to a sequential enzymatic reaction of the mixture of LOx-SiO\n                    <jats:sub>2<\/jats:sub>\n                    @Fe\n                    <jats:sub>3<\/jats:sub>\n                    O\n                    <jats:sub>4<\/jats:sub>\n                    and POx-SiO\n                    <jats:sub>2<\/jats:sub>\n                    @Fe\n                    <jats:sub>3<\/jats:sub>\n                    O\n                    <jats:sub>4<\/jats:sub>\n                    NPs with lactate and pyruvate, respectively. In the second step, the absorbance at 450\u00a0nm of the yellow-orange [Cu(Nc)\n                    <jats:sub>2<\/jats:sub>\n                    ]\n                    <jats:sup>+<\/jats:sup>\n                    complex formed through the color reaction of enzymatically produced H\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    with [Cu(Nc)\n                    <jats:sub>2<\/jats:sub>\n                    ]\n                    <jats:sup>2+<\/jats:sup>\n                    was recorded. The results indicate that the developed colorimetric binary enzymatic biosensor exhibits a broad linear range of response between 0.5 and 50.0\u00a0\u00b5M for lactate under optimal conditions with a detection limit of 0.17\u00a0\u00b5M. The fabricated biosensor did not respond to other saccharides, while the positive interferences of certain reducing compounds such as dopamine, ascorbic acid, and uric acid were minimized through their oxidative removal with a pre-oxidant (NaBiO\n                    <jats:sub>3<\/jats:sub>\n                    ) before enzymatic and colorimetric reactions. The fabricated optical biosensor was applied to various samples such as artificial blood, artificial\/real sweat, and cow milk. The high recovery values (close to 100%) achieved for lactate-spiked samples indicate an\u00a0acceptable\u00a0accuracy of this colorimetric biosensor in the determination of lactate in real samples. Due to the increase in H\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    production with the bienzymatic lactate sensor, the proposed method displays double-fold sensitivity relative to monoenzymatic biosensors and involves a neat color reaction with cupric-neocuproine having a clear stoichiometry as opposed to the rather indefinite stoichiometry of analogous redox dye methods.\n                  <\/jats:p>\n                  <jats:p>\n                    <jats:bold>Graphical Abstract<\/jats:bold>\n                  <\/jats:p>","DOI":"10.1007\/s00604-024-06531-w","type":"journal-article","created":{"date-parts":[[2024,7,9]],"date-time":"2024-07-09T00:01:51Z","timestamp":1720483311000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["A new colorimetric lactate biosensor based on CUPRAC reagent using binary enzyme (lactate-pyruvate oxidases)-immobilized silanized magnetite nanoparticles"],"prefix":"10.1007","volume":"191","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0320-3551","authenticated-orcid":false,"given":"Selen","family":"Ayaz","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0885-0520","authenticated-orcid":false,"given":"Teslime","family":"Er\u015fan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2980-6871","authenticated-orcid":false,"given":"Yusuf","family":"Dilgin","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1739-5814","authenticated-orcid":false,"given":"Re\u015fat","family":"Apak","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,7,9]]},"reference":[{"key":"6531_CR1","doi-asserted-by":"publisher","first-page":"10","DOI":"10.1016\/j.semcdb.2009.01.010","volume":"20","author":"PJ Conroy","year":"2009","unstructured":"Conroy PJ, Hearty S, Leonard P, O\u2019Kennedy RJ (2009) Antibody production, design and use for biosensor-based applications. 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