title: Isolation and structures of oligomeric wine pigments by bisulfite-mediated ion-exchange chromatography.
abstract: Methods have been developed that are based on cation exchange chromatography in the absence and presence of excess bisulfite for the isolation of wine pigments from Australian red wine and grape marc extract. The pigments were identified using HPLC and electrospray ionization mass spectrometry. The mass spectral data indicate that these pigments are C4-substituted anthocyanins with a tetracyclic structure. The pigments form a series of closely related oligomeric pigments which include those previously described in the literature, such as pigment A and vitisin A, as well as some newly identified pigments.
authors.affiliation: Department of Horticulture, Viticulture and Oenology, University of Adelaide, Waite Campus, PMB 1, Glen Osmond, South Australia, 5064.
authors.forename: R E
authors.initials: RE
authors.lastname: Asenstorfer
authors.forename: Y
authors.initials: Y
authors.lastname: Hayasaka
authors.forename: G P
authors.initials: GP
authors.lastname: Jones
mesh_terms: D002852:Chromatography, Ion Exchange; D008958:Models, Molecular; D015394:Molecular Structure; D010860:Pigments, Biological / Q000737:chemistry / Q000302:isolation & purification*; D013447:Sulfites; D014920:Wine / Q000032:analysis*
chemical_list: D010860:Pigments, Biological; D013447:Sulfites