title: Polyphenol screening of pomace from red and white grape varieties (Vitis vinifera L.) by HPLC-DAD-MS/MS.
abstract: Phenolic compounds of 14 pomace samples originating from red and white winemaking were characterized by HPLC-MS. Up to 13 anthocyanins, 11 hydroxybenzoic and hydroxycinnamic acids, and 13 catechins and flavonols as well as 2 stilbenes were identified and quantified in the skins and seeds by HPLC-DAD. Large variabilities comprising all individual phenolic compounds were observed, depending on cultivar and vintage. Grape skins proved to be rich sources of anthocyanins, hydroxycinnamic acids, flavanols, and flavonol glycosides, whereas flavanols were mainly present in the seeds. However, besides the lack of anthocyanins in white grape pomace, no principal differences between red and white grape varieties were observed. This is the first study presenting comprehensive data on the contents of individual phenolic compounds comprising all polyphenolic subclasses of grapes including a comparison of several red and white pomaces from nine cultivars. The results obtained in the present study confirm that both skins and seeds of most grape cultivars constitute a promising source of polyphenolics.
authors.affiliation: Institute of Food Technology, Section Plant Foodstuff Technology, Hohenheim University, August-von-Hartmann-Strasse 3, D-70599 Stuttgart, Germany.
authors.forename: Dietmar
authors.initials: D
authors.lastname: Kammerer
authors.forename: Achim
authors.initials: A
authors.lastname: Claus
authors.forename: Reinhold
authors.initials: R
authors.lastname: Carle
authors.forename: Andreas
authors.initials: A
authors.lastname: Schieber
mesh_terms: D000872:Anthocyanins / Q000032:analysis; D005591:Chemical Fractionation; D002851:Chromatography, High Pressure Liquid; D005419:Flavonoids / Q000032:analysis*; D005638:Fruit / Q000737:chemistry*; D062385:Hydroxybenzoates / Q000032:analysis; D013058:Mass Spectrometry; D010636:Phenols / Q000032:analysis*; D059808:Polyphenols; D013267:Stilbenes / Q000032:analysis; D027843:Vitis / Q000737:chemistry*
chemical_list: D000872:Anthocyanins; D005419:Flavonoids; D062385:Hydroxybenzoates; D010636:Phenols; D059808:Polyphenols; D013267:Stilbenes; C017616:phenolic acid