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Magnetic restricted-access carbon nanotubes for the extraction/pre-concentration of organophosphates from food samples followed by spectrophotometric determination.
Frugeri, Pedro Marcos; da Silva Cavalcanti, Marcello Henrique; do Lago, Ayla Campos; Figueiredo, Eduardo Costa; Tarley, Cesar Ricardo Teixeira; Wisniewski, Célio; Luccas, Pedro Orival.
Afiliação
  • Frugeri PM; Institute of Chemistry, Federal University of Alfenas, 37130-000 Alfenas, MG, Brazil.
  • da Silva Cavalcanti MH; Institute of Chemistry, Federal University of Alfenas, 37130-000 Alfenas, MG, Brazil.
  • do Lago AC; Institute of Chemistry, Federal University of Alfenas, 37130-000 Alfenas, MG, Brazil; Laboratory of Toxicant and Drug Analyses, Federal University of Alfenas, 37130-000 Alfenas, MG, Brazil.
  • Figueiredo EC; Laboratory of Toxicant and Drug Analyses, Federal University of Alfenas, 37130-000 Alfenas, MG, Brazil.
  • Tarley CRT; Department of Chemistry, State University of Londrina, Rodovia Celso Garcia Cid, 445, Km 380, Londrina, 86057-970, PR, Brazil.
  • Wisniewski C; Department of Physics, Federal University of Alfenas, 37130-000 Alfenas, MG, Brazil.
  • Luccas PO; Institute of Chemistry, Federal University of Alfenas, 37130-000 Alfenas, MG, Brazil. Electronic address: pedro.luccas@unifal-mg.edu.br.
Spectrochim Acta A Mol Biomol Spectrosc ; 241: 118632, 2020 Nov 05.
Article em En | MEDLINE | ID: mdl-32650243
In this work, magnetic restricted-access carbon nanotubes (M-RACNTs) were synthesized, characterized and used in the dispersive solid-phase extraction (d-SPE) of organophosphate pesticides (OPPs) from food samples (broccoli, eggplant, cauliflower, and soy milk), followed by spectrophotometric determination in a flow injection analysis system. Fe3O4 nanoparticles were incorporated in the multi-walled carbon nanotubes employing dimethylformamide. The dimethylformamide was used as a solvent in the incorporation process, forming the suspension of both particles. The resulting M-CNTs were covered with an external bovine serum albumin (BSA) layer, chemically crosslinked. M-RACNTs were able to efficiently capture OPPs, excluding about 95% of the proteins from food matrices. The analyses were carried out in a flow injection analysis system (FIA), with the spectrophotometric detection (at 560 nm) of the complex formed by the reaction between OPPs, N-bromosuccinimide and rhodamine B. A fractional factorial design method was used to optimize the experimental parameters. The addition/recovery test showed results from 95.5% to 108.9%. Accuracies were checked by comparing the results obtained with the proposed and standard HPLC methods, which were in agreement. The proposed method was linear from 5 to 90 µg L-1 of OPPs, with limits of detection and quantification of 0.74 and 5 µg L-1 and precision of 3.67%, expressed as relative standard deviation. The pre-concentration factor was about 164 times.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Nanotubos de Carbono Idioma: En Revista: Spectrochim Acta A Mol Biomol Spectrosc Assunto da revista: BIOLOGIA MOLECULAR Ano de publicação: 2020 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido
Texto completo
Adicionar na Minha BVS
Imprimir
XML
PubMed Links
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Nanotubos de Carbono Idioma: En Revista: Spectrochim Acta A Mol Biomol Spectrosc Assunto da revista: BIOLOGIA MOLECULAR Ano de publicação: 2020 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido