title: Resveratrols in Vitis berry skins and leaves: their extraction and analysis by HPLC.
abstract: An orthogonal L(36) (6)(5) test design was applied to select the optimum conditions for extracting resveratrols from grape berry skins and leaves. Solvent choice was the most important factor in the extraction of resveratrols, and mixed methanol and ethyl acetate [50:50 (v/v)] had much higher extraction efficiency than the other five solvents tested. For extracting resveratrols, 1g of berry skins or leaf tissue extracted in 10 mL methanol and ethyl acetate [50:50 (v/v)] for 24h at 25°C in darkness was the optimized extraction condition. The optimized analytical method for HPLC was a multi-step gradient elution using acetonitrile and water. The optimized method was used to determine resveratrols among three different cultivars. The cultivar 'Zhi 168' had the highest total resveratrols in berry skins while 'Saint-Emilion' had the lowest resveratrols. The resveratrol content of 'Beta' was between that of 'Zhi 168' and 'Saint-Emilion'.
authors.affiliation: Beijing Key Laboratory of Grape Science and Wine Technology, and Key Laboratory of Plant Resource Science, Institute of Botany, The Chinese Academy of Sciences, Beijing 100093, PR China.
authors.forename: Chunyan
authors.initials: C
authors.lastname: Liu
authors.forename: Lijun
authors.initials: L
authors.lastname: Wang
authors.forename: Junfang
authors.initials: J
authors.lastname: Wang
authors.forename: Benhong
authors.initials: B
authors.lastname: Wu
authors.forename: Wen
authors.initials: W
authors.lastname: Liu
authors.forename: Peige
authors.initials: P
authors.lastname: Fan
authors.forename: Zhenchang
authors.initials: Z
authors.lastname: Liang
authors.forename: Shaohua
authors.initials: S
authors.lastname: Li
mesh_terms: D005591:Chemical Fractionation / Q000379:methods*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D005638:Fruit / Q000737:chemistry; D010936:Plant Extracts / Q000032:analysis* / Q000302:isolation & purification; D018515:Plant Leaves / Q000737:chemistry; D000077185:Resveratrol; D013267:Stilbenes / Q000032:analysis*; D027843:Vitis / Q000737:chemistry*
chemical_list: D010936:Plant Extracts; D013267:Stilbenes; D000077185:Resveratrol