论文信息 - Polyaniline-based microelectrodes for sensing ascorbic acid in beverages

Polyaniline-based microelectrodes for sensing ascorbic acid in beverages

Abstract Thin films of polyaniline containing the dopant ions polyvinylsulfonate (PVS) and polystyrenesulfonate (PSS) have been prepared on 25 μm Pt disk microelectrodes and tested for ascorbic acid oxidation in various buffers and in wine and orange juice containing solutions. A potential of 0.1 V (SCE) was found to be most suited for the amperometric determination of ascorbic acid in beverages diluted with a neutral pH buffer, with minimal interference from other oxidisable compounds. However, unknown wine and juice components lessen the ascorbic acid oxidation current through their interaction with the polyaniline layer.

[1] A. Waterhouse,et al. A cyclic voltammetry method suitable for characterizing antioxidant properties of wine and wine phenolics. , 2001, Journal of agricultural and food chemistry.

[2] P. Bartlett,et al. The oxidation of β-nicotinamide adenine dinucleotide (NADH) at poly(aniline)-coated electrodes. Part II. Kinetics of reaction at poly(aniline)-poly(styrenesulfonate) composites , 2000 .

[3] S. Ivanov,et al. Conductometric transducing in electrocatalytical sensors: Detection of ascorbic acid , 2006 .

[4] Itamar Willner,et al. Enhanced Bioelectrocatalysis Using Au-Nanoparticle/Polyaniline Hybrid Systems in Thin Films and Microstructured Rods Assembled on Electrodes , 2005 .

[5] A. Waterhouse,et al. Correlation of Wine Phenolic Composition versus Cyclic Voltammetry Response , 2002, American Journal of Enology and Viticulture.

[6] P. Bartlett,et al. The oxidation of ascorbate at poly(aniline)–poly(vinylsulfonate)composite coated electrodes , 2001 .

[7] A. Malinauskas,et al. Electrochemical response of ascorbic acid at conducting and electrogenerated polymer modified electrodes for electroanalytical applications: a review. , 2004, Talanta.

[8] J. Pinson,et al. Oxidation of caffeic acid and related hydroxycinnamic acids , 1996 .