{
  "abstract": "A Fe2O3–MgO–CuO composite integrated with multiwalled carbon nanotubes (MWCNTs) was employed to develop a platform for the indirect electrochemical detection of l-cysteine (l-CYS). The material was characterized by XRD, FTIR, SEM, EDS, and EIS, confirming the formation of a hybrid nanostructure. After optimization of the experimental parameters, the modified glassy carbon electrode exhibited a well-defined cathodic response at −0.25 V vs Ag/AgCl (saturated KCl). Although l-CYS undergoes electrochemical oxidation at positive potentials (approximately +0.25 V), quantitative analysis was based on the effect of the presence of l-CYS on the cathodic response of the modified electrode. The determination of the analyte was performed using linear sweep voltammetry, yielding two linear response ranges of 0.5–100 μmol L–1 (R2 = 0.992) and 100–1000 μmol L–1 (R2 = 0.996). The lowest detectable concentration of l-CYS with the Fe2O3–MgO–CuO@MWCNT/GCE electrode was 0.5 μmol L–1. The sensor exhibited high selectivity, excellent repeatability (RSD = 1.58%), and reproducibility (RSD = 1.82%). The sensor was evaluated for l-CYS determination in urine and breast milk samples, providing satisfactory recovery values.",
  "abstract_shown": true,
  "affiliations": [
    "Universidade Federal do Maranhão , Avenida dos Portugueses, No 1966, Bacanga , , ,",
    "Instituto Federal de Educação, Ciência e Tecnologia do Maranhão , Avenida Getúlio Vargas, No 04, Monte Castelo , , ,"
  ],
  "article_type": "research article",
  "arxiv": null,
  "author_total": 5,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Danilo B. Ribeiro"
    },
    {
      "affs": [
        0
      ],
      "name": "Carolina A. Carvalho"
    },
    {
      "affs": [
        1
      ],
      "name": "Natilene M. Brito"
    },
    {
      "affs": [
        0
      ],
      "name": "Flavio S. Damos",
      "orcid": "0000-0002-9465-6427"
    },
    {
      "affs": [
        0
      ],
      "name": "Rita C. S. Luz",
      "orcid": "0000-0002-2972-4104"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/842x9ptaz37n2.bib",
  "cited_by": 0,
  "doi": "10.1021/acsomega.6c05509",
  "fulltext_url": "https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13717787/?tool=EBI",
  "id": "842x9ptaz37n2",
  "issns": [
    "2470-1343"
  ],
  "landing_url": "https://pubs.acs.org/acsodf/article/11/42/64840/5451449/Fe2O3-MgO-CuO-MWCNT-Nanocomposite-for-Highly",
  "language": "eng",
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "heading",
      "Article"
    ],
    [
      "openalex",
      "2208|Electrochemical sensors and biosensors"
    ]
  ],
  "openalex": "W7221836483",
  "pdf_url": "https://pubs.acs.org/doi/pdf/10.1021/acsomega.6c05509",
  "pmcid": "PMC13717787",
  "pmid": "42959659",
  "published": "2026-10-14",
  "publisher": "American Chemical Society (ACS)",
  "ris": "https://research.draconitic.com/paper/842x9ptaz37n2.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:39Z",
      "native_id": "10.1021/acsomega.6c05509",
      "source": "crossref",
      "url": "https://pubs.acs.org/acsodf/article/11/42/64840/5451449/Fe2O3-MgO-CuO-MWCNT-Nanocomposite-for-Highly"
    },
    {
      "first_seen": "2026-10-31T00:20:37Z",
      "native_id": "PMC:PMC13717787",
      "source": "europepmc",
      "url": "https://europepmc.org/article/PMC/PMC13717787"
    },
    {
      "first_seen": "2026-11-01T00:20:52Z",
      "native_id": "MED:42959659",
      "source": "europepmc",
      "url": "https://europepmc.org/article/MED/42959659"
    },
    {
      "first_seen": "2026-11-02T12:22:03Z",
      "native_id": "PMC13717787",
      "source": "pmc",
      "url": "https://doi.org/10.1021/acsomega.6c05509"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "issn:2470-1343",
      "subfield": "general"
    }
  ],
  "title": "Fe2O3–MgO–CuO@MWCNT Nanocomposite for Highly Sensitive Electrochemical Detection of l -Cysteine at Low Potential in Biological Samples",
  "title_text": "Fe2O3–MgO–CuO@MWCNT Nanocomposite for Highly Sensitive Electrochemical Detection of l -Cysteine at Low Potential in Biological Samples",
  "type": "peer-reviewed",
  "updated_at": "2026-11-02T12:22:03Z",
  "url": "https://research.draconitic.com/paper/842x9ptaz37n2",
  "venue": "ACS Omega",
  "versions": []
}