title: Isolation and identification of stilbenes in two varieties of Polygonum cuspidatum.
abstract: The roots of two varieties of Polygonum cuspidatum (Hu Zhang and Mexican Bamboo) were analyzed for resveratrol and analogues. The roots of each variety were dried and ground into a powder. The powdered roots were then extracted with methanol and ethyl acetate. The ethyl acetate fraction of the Mexican Bamboo was then subjected to fractionation and purification using silica gel column chromatography and semipreparative HPLC. In addition to resveratrol (3,5,4'-trihydroxystilbene), three stilbene glucosides were identified by (1)H NMR, (13)C NMR, and MS. The stilbene glucosides were shown to be a piceatannol glucoside (3,5,3', 4'-tetrahydroxystilbene 4'-O-beta-D-glucopyranoside), resveratroloside (3,5,4'-trihydroxystilbene 4'-O-beta-D-glucopyranoside), and piceid (3,5,4'-trihydroxystilbene 3-O-beta-D-glucopyranoside). The levels of the piceatannol glucoside and piceid were twice as high in the Mexican Bamboo as compared to the Hu Zhang.
authors.affiliation: Center for Advanced Food Technology and Department of Food Science, Cook College, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08901-8520, USA.
authors.forename: B C
authors.initials: BC
authors.lastname: Vastano
authors.forename: Y
authors.initials: Y
authors.lastname: Chen
authors.forename: N
authors.initials: N
authors.lastname: Zhu
authors.forename: C T
authors.initials: CT
authors.lastname: Ho
authors.forename: Z
authors.initials: Z
authors.lastname: Zhou
authors.forename: R T
authors.initials: RT
authors.lastname: Rosen
mesh_terms: D002851:Chromatography, High Pressure Liquid; D005960:Glucosides / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D018517:Plant Roots / Q000737:chemistry; D019664:Polygonaceae / Q000737:chemistry*; D000077185:Resveratrol; D013267:Stilbenes / Q000737:chemistry*
chemical_list: C000592752:3,5,4'-trihydroxystilbene-4'-O-glucoside; D005960:Glucosides; D013267:Stilbenes; D000077185:Resveratrol