Electroanalytical Determination of Fenthion in Passiflora alata Tincture Samples

Autor(es)

Franca, Rafaela Ferreira ^{[1, 2]} ; Lima, Thays de Souza ^[3] ; Simoes, Fabio Ruiz ^{[3, 4]} ; Codognoto, Lucia ^[3]

Afiliação do(s) autor(es)

^[1] Univ Camilo Castelo Branco, Estr Dr Altino Bondesan 500, BR-1224716 Sao Jose Dos Campos, SP - Brazil

^[2] UNISEPE, Fac Sao Lourenco, BR-90374700 Sao Lourenco, MG - Brazil

^[3] UNFESP, Inst Environm Chem & Pharmaceut Sci, Dept Chem, DQ, Rua Prof Artur Riedel 275, BR-09972270 Diadema, SP - Brazil

^[4] UNIFESP, IMAR, Inst Marine Sci, Rua Carvalho de Mendonca 144, BR-11070100 Santos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ORBITAL-THE ELECTRONIC JOURNAL OF CHEMISTRY; v. 10, n. 2, p. 92-97, JAN-MAR 2018.
• Citações Web of Science: 2

Resumo

In this work a direct, simple, fast and sensitive method to determine Fenthion was developed using a Boron-Doped Diamond Electrode and Square Wave Voltammetry. The method was applied into Passiflora alata herbal medicinal tinctures derivate from passion fruits. None previous treatment such as derivation or pre-concentration of the analyte was done. Cyclic Voltammetry results showed well defined irreversible oxidation peaks at around 1.27 V into the pH range of 2.0 to 8.0. Square Wave Voltammetry was used to analytical determination and the analysis parameters, such as frequency, amplitude and pH from support electrolyte were optimized. A calibration curve was obtained, and it was observed a sensitivity of 0.38 A/mol L-1 and linearity of 0.995. The limits of detection and quantification were 8.0x10(-8) mol L-1 (21 mu g L-1) and 2.5x10(-7) mol L-1 (70 mu g L-1), respectively. Recovery studies were applied using Passiflora alata samples fortified with Fenthion in concentrations of 2.5 mu mol L-1 and 4.0 mu mol L-1, followed by the standard addition of the pesticide aliquots. It was observed that the complex matrix does not interferes in the method. The recovery results were about 98.4 and 112.0%, reinforcing that the method is suitable to determine the analyte in target complexes samples, such as Herbal Medicinal Plants. (AU)

• Processo FAPESP: 08/50588-6 - Eletrodos de ouro modificados por monocamadas auto-organizadas aplicados à determinação de pesticidas
• Beneficiário: Lucia Codognoto de Oliveira
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 14/23858-3 - Desenvolvimento de materiais de sensores baseados em filmes automontados de polímeros condutores e nanotubos de carbono para a determinação de desreguladores endócrinos em ambientes marinhos
• Beneficiário: Fabio Ruiz Simões
• Modalidade de apoio: Auxílio à Pesquisa - Regular