Electrochemical study of simple coumarin and its determination in aqueous infusion of Mikania glomerata

Autor(es)

Daniela M. Miyano ^[1] ; Thays Lima ^[1] ; Fábio R. Simões ^[3] ; Mauro A. La-Scalea ^[1] ; Hueder P. M. Oliveira ^[3] ; Lucia Codognoto ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Paulo, Dept Ciencias Exatas & Terra, Inst Ciencias Ambientais Quim & Farmaceut, BR-09972270 Diadema, SP - Brazil

^[2] Universidade Federal de São Paulo. Instituto de Ciências Ambientais, Químicas e Farmacêuticas. Departamento de Ciências Exatas e da Terra - Brasil

^[3] Univ Fed ABC, Ctr Ciencias Nat & Humanas, BR-09210170 Santo Andre, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of the Brazilian Chemical Society; v. 25, n. 3, p. 602-609, 2014-03-00.

Resumo

The present study aims the development and application of an electrochemical method for simple coumarin determination in aqueous media by using a boron-doped diamond electrode (BDDE). The studies were carried out at pH 8.0 by cyclic voltammetry (CV) and registered an irreversible reduction process controlled by diffusion with the peak potential recorded around -1.6 V. The square wave voltammetry analysis (SWV) showed the reversible behavior of the electrochemical reduction of coumarin at the same pH. Additionally, the reversibility of the process was improved by increasing the solution pH. The chronoamperometry study showed that the coumarin reduction process involves two electrons. From the optimized SWV parameters, the analytical curve was constructed in a linear range between 0.5 × 10-5 and 10.0 × 10-5 mol L-1. The limits of detection and quantification were 1.5 × 10-6 mol L-1 and 4.5 × 10-6 mol L-1, respectively. The coumarin was determined in an aqueous infusion of Mikania glomerata, showing recovery values between 92 and 104%. (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