title: Spectroscopic and theoretical investigations of phenolic acids in white wines.
abstract: Model solutions of white wines containing phenolic acids have been investigated by means of UV-vis, laser induced fluorescence and Raman spectroscopic techniques. In order to interpret the spectra, density functional theory calculations of phenolic acids have been performed. This work demonstrates that only hydroxynamic acids are in resonance with a laser excitation line with 325nm wavelength and are therefore at the origin of the strong enhancement of the Raman light scattering. Real white wines also display such resonance Raman scattering so that their content in hydroxycinnamic acids may be quite precisely determined. The analysis of the Raman spectrum of a real dry white wine reveals qualitatively the preponderance in its composition of p-coumaric and caftaric acids.
authors.affiliation: Université de Bordeaux, CNRS UMR 5255, ISM, 351 cours de la Libération, 33405 Talence Cedex, France; Advanced Track and Trace, ATT 99 avenue de la châtaigneraie, F-92500 Rueil Malmaison, France.
authors.forename: Coralie
authors.initials: C
authors.lastname: Martin
authors.affiliation: Université de Bordeaux, CNRS UMR 5255, ISM, 351 cours de la Libération, 33405 Talence Cedex, France.
authors.forename: Jean-Luc
authors.initials: JL
authors.lastname: Bruneel
authors.affiliation: Université de Bordeaux, CNRS UMR 5255, ISM, 351 cours de la Libération, 33405 Talence Cedex, France.
authors.forename: Frédéric
authors.initials: F
authors.lastname: Castet
authors.affiliation: Université de Bordeaux, CNRS UMR 5255, ISM, 351 cours de la Libération, 33405 Talence Cedex, France.
authors.forename: Alain
authors.initials: A
authors.lastname: Fritsch
authors.affiliation: Université de Bordeaux, ISVV, EA4577 Unité de Recherche Œnologie, F-33140 Villenave D'ornon, France; INRA, ISVV, USC 1366 Œnologie, F-33140 Villenave d'Ornon, France.
authors.forename: Pierre-Louis
authors.initials: PL
authors.lastname: Teissedre
authors.affiliation: Université de Bordeaux, ISVV, EA4577 Unité de Recherche Œnologie, F-33140 Villenave D'ornon, France; INRA, ISVV, USC 1366 Œnologie, F-33140 Villenave d'Ornon, France.
authors.forename: Michael
authors.initials: M
authors.lastname: Jourdes
authors.affiliation: Université de Bordeaux, CNRS UMR 5255, ISM, 351 cours de la Libération, 33405 Talence Cedex, France. Electronic address: f.guillaume@ism.u-bordeaux1.fr.
authors.forename: François
authors.initials: F
authors.lastname: Guillaume
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods; D003373:Coumaric Acids / Q000737:chemistry*; D062385:Hydroxybenzoates / Q000032:analysis / Q000737:chemistry*; D013057:Spectrum Analysis / Q000379:methods*; D013059:Spectrum Analysis, Raman / Q000379:methods*; D014920:Wine / Q000032:analysis*
chemical_list: D003373:Coumaric Acids; D062385:Hydroxybenzoates; C017616:phenolic acid
keywords: DFT calculations; Fluorescence spectroscopy; Hydroxycinnamic acids; Phenolic composition; Resonance Raman spectroscopy; White wines