title: Rapid fingerprinting of white wine oxidizable fraction and classification of white wines using disposable screen printed sensors and derivative voltammetry.
abstract: This work describes the application of disposable screen printed carbon paste sensors for the analysis of the main white wine oxidizable compounds as well as for the rapid fingerprinting and classification of white wines from different grape varieties. The response of individual white wine antioxidants such as flavanols, flavanol derivatives, phenolic acids, SO2 and ascorbic acid was first assessed in model wine. Analysis of commercial white wines gave voltammograms featuring two unresolved anodic waves corresponding to the oxidation of different compounds, mostly phenolic antioxidants. Calculation of the first order derivative of measured current vs. applied potential allowed resolving these two waves, highlighting the occurrence of several electrode processes corresponding to the oxidation of individual wine components. Through the application of Principal Component Analysis (PCA), derivative voltammograms were used to discriminate among wines of different varieties.
authors.affiliation: Nomacorc France, 7 Av. Yves Cazeaux, 30230 Rodilhan, France; Department of Biotechnology, University of Verona, Villa Lebrecht, Via della Pieve - 37029 San Pietro in Cariano (VR), Italy. Electronic address: maurizio.ugliano@univr.it.
authors.forename: Maurizio
authors.initials: M
authors.lastname: Ugliano
mesh_terms: D000975:Antioxidants / Q000032:analysis*; D015374:Biosensing Techniques / Q000295:instrumentation*; D004553:Electric Conductivity; D055664:Electrochemical Techniques / Q000295:instrumentation*; D004566:Electrodes; D010084:Oxidation-Reduction; D025341:Principal Component Analysis; D027843:Vitis / Q000737:chemistry*; D014920:Wine / Q000032:analysis* / Q000145:classification*
chemical_list: D000975:Antioxidants
keywords: Derivative voltammetry; Linear sweep voltammetry; Screen printed sensors; White wine phenolics