Determination of Hydroquinone with a Carbon Nanotube/Polyurethane Resin Composite Electrode

Autor(es)

dos Santos, Sidney Xavier ^[1] ; Gomes Cavalheiro, Eder Tadeu ^[2]

Afiliação do(s) autor(es)

^[1] Fed Univ Vicosa Rio Paranaiba, Exact Sci & Technol Inst, Rio Paranaiba, MG - Brazil

^[2] Univ Sao Paulo, Sao Carlos Inst Chem, Dept Chem & Mol Phys, Av Trabalhador Sao Carlense, 400, CP 676, BR-13560970 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Analytical Letters; v. 49, n. 10, p. 1513-1525, 2016.
• Citações Web of Science: 4

Resumo

A new composite electrode based on multi-walled carbon nanotubes and a polyurethane resin was evaluated using potassium ferricyanide and hydroquinone as probes. The device was used for the determination of hydroquinone in a cosmetic formulation. The effect of using multi-walled carbon nanotubes and graphite mixtures in various proportions was also investigated. Cyclic voltammetry and scanning electron micrography were used for characterization of electrode compositions. Hydroquinone was determined using a 60% (m/m) multi-walled carbon nanotubes/polyurethane resin electrode by differential pulse voltammetry with a linear dynamic range from 0.05 to 1.12 m mol L-1 and a limit of detection of 12 mu mol L-1. The analysis of commercial cosmetic formulation was performed by differential pulse voltammetry and high-performance liquid chromatography as a comparison method. The results for both procedures agreed at the 95% confidence level according to Student's t-test. The reported electrode was mechanically robust and provided reproducible results. (AU)

• Processo FAPESP: 11/02705-6 - Desenvolvimento e aplicação de "enzymeless biosensors" via modificação de eletrodos compósitos à base de grafite-poliuretana com complexos metálicos de bases de Schiff.
• Beneficiário: Sidney Xavier dos Santos
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado