title: Efficacy of chitosan in inhibiting the oxidation of (+)-catechin in white wine model solutions.
abstract: The efficacy of chitosan and sulfites in inhibiting the oxidation of (+)-catechin in aerated model white wines has been compared by monitoring the browning development and the generation of oxidized phenolic compounds. In addition, the protecting effects of these two additives toward the oxidative decay of varietal thiols were investigated. Chitosan effectively contrasted the browning onset in model solutions all along the entire duration of the experimentation. Color development was limited and comparable in both the sulfite and chitosan added samples. Thanks to its polyelectrolyte behavior, chitosan adsorbed up to 80% of the more hydrophilic oxidized phenolic species and chelated 70 and 30% of Fe and Cu added to the solutions, respectively. Thiol oxidation was significantly lowered by chitosan, suggesting that this additive could contribute to maintain the varietal character of wines coming from aromatic grapes and vinified with reduced sulfite amounts.
authors.affiliation: Department of Agricultural and Food Sciences, Alma Mater Studiorum, University of Bologna , Piazza Goidanich, 60, 47521 Cesena, Forlì-Cesena, Italy.
authors.forename: Fabio
authors.initials: F
authors.lastname: Chinnici
authors.forename: Nadia
authors.initials: N
authors.lastname: Natali
authors.forename: Claudio
authors.initials: C
authors.lastname: Riponi
mesh_terms: D002392:Catechin / Q000737:chemistry* / Q000378:metabolism; D048271:Chitosan / Q000494:pharmacology*; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D003116:Color; D005503:Food Additives / Q000494:pharmacology*; D008401:Gas Chromatography-Mass Spectrometry; D008670:Metals / Q000737:chemistry; D010084:Oxidation-Reduction; D010636:Phenols / Q000378:metabolism; D012996:Solutions; D013438:Sulfhydryl Compounds / Q000737:chemistry; D013447:Sulfites / Q000494:pharmacology; D014920:Wine
chemical_list: D005503:Food Additives; D008670:Metals; D010636:Phenols; D012996:Solutions; D013438:Sulfhydryl Compounds; D013447:Sulfites; D002392:Catechin; D048271:Chitosan
keywords: (+)-catechin; chitosan; oxidation; sulfite; varietal thiols; white wine