Glassy Carbon Electrode Modified with Functionalized Carbon Nanotubes Within a Poly(allylamine hydrochloride) Film for the Voltammetric Determination of Sulfite in Foods

Author(s)

Sartori, Elen Romao ^[1] ; Takeda, Humberto Hissashi ^[2] ; Fatibello-Filho, Orlando ^[1]

Affiliation

^[1] Univ Fed Sao Carlos, Dept Quim, BR-13560970 Sao Carlos, SP - Brazil

^[2] Fundacao Univ Fed Rondonia, Dept Engn Alimentos, BR-76872862 Ariquemes, RO - Brazil

• Document type: Journal article
• Source: Electroanalysis; v. 23, n. 11, p. 2526-2533, NOV 2011.
• Web of Science Citations: 22

Abstract

The performance of a glassy carbon electrode modified with functionalized multiwalled carbon nanotubes within a poly(allylamine hydrochloride) film (GCE/PAH/MWCNTs) for the voltammetric determination of sulfite in food samples is described. The anodic peak potential for sulfite oxidation at a GCE/PAH/MWCNTs was 0.41 V whereas at GCE/PAH and GCE, the peak potentials were 0.96 and 0.89 V, respectively. Using square-wave voltammetric technique, the obtained analytical curve was linear in the sulfite concentration range from 1.1 x 10(-5) to 3.9 x 10(-4) M, with a detection limit of 4.2 mu M. The electrode was successfully used to determinate sulfite in vinegar, pickle water, coconut water, and shredded coconut. (AU)

• FAPESP's process: 09/14454-8 - Modified carbon electrodes with carbon nanotubes and/or metallic nanoparticles in chitosan film for determination of sulphur compounds in petroleum derivatives and food
• Grantee: Elen Julciléia Romão Sartori
• Support Opportunities: Scholarships in Brazil - Post-Doctoral