title: Phenolic compounds from Hypericum perforatum.
abstract: During a re-investigation of phenolic compounds from the dried crude drug material of St. John's wort (Hypericum perforatum L.) 22 phenolic compounds were detected by HPLC; 14 of them were quantified using the same system. Twelve phenolic compounds were isolated from the plant material and their structures identified mainly by spectroscopic methods, among them quercetin-3-O-(2"-O-acetyl)-beta-D-galactoside as a new natural product. Cryptochlorogenic acid, protocatechuic acid, 3-O-[Z]-p-coumaroylquinic acid, isoorientin, cyanidin-3-O-alpha-L-rhamnoside, and astilbin were obtained for the first time from this source; the earlier suspected neochlorogenic acid, 3-O-[E]-p-coumaroylquinic acid, mangiferin, miquelianin and guaijaverin were confirmed.
authors.affiliation: Institute of Pharmaceutical Biology and Phytochemistry, Westfälische Wilhelms-University of Münster, Germany.
authors.forename: Guido
authors.initials: G
authors.lastname: Jürgenliemk
authors.forename: Adolf
authors.initials: A
authors.lastname: Nahrstedt
mesh_terms: D002138:Calibration; D002851:Chromatography, High Pressure Liquid; D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification*; D020902:Hypericum; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D010636:Phenols / Q000737:chemistry / Q000302:isolation & purification*; D010936:Plant Extracts / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D005419:Flavonoids; D010636:Phenols; D010936:Plant Extracts