title: HPLC separation of flavonols, flavones and oxidized flavonols with UV-, DAD-, electrochemical and ESI-ion trap MS detection.
abstract: The cation-induced or electrochemical oxidation of flavonols has been reported to yield 2-(hydroxybenzoyl)-2-hydroxy-3(2H)-benzofuranone. Two new gradient reversed phase HPLC methods are presented which allow the determination of those oxidized flavonols simultaneously with flavonols and flavones. UV and electrochemical detection are used because of their high sensitivity. Qualitative detection together with quantification of all compounds is achieved with photodiode-array detection. An electrospray ionization ion trap mass spectrometric method is presented for unique identification of the benzofuranones after HPLC separation.
authors.affiliation: ZA für Chemische Analytik und Endokrinologie, Zentrum für Lebensmittelwissenschaften, Tierärztliche Hochschule Hannover, Germany.
authors.forename: G
authors.initials: G
authors.lastname: Jungbluth
authors.forename: W
authors.initials: W
authors.lastname: Ternes
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification*; D044948:Flavonols; D010084:Oxidation-Reduction; D013057:Spectrum Analysis
chemical_list: D005419:Flavonoids; D044948:Flavonols