title: Thermospray-LC-MS analysis of various groups of polyphenols in tea. II: Chlorogenic acids, theaflavins and thearubigins.
abstract: An account is given of the application of thermospray LC-MS in the analysis of caffeoyl- and p-coumaroylquinic acids, theaflavins and thearubigins in black tea. All compounds, except for the thearubigens, could be detected as the pseudo-molecular ion [M + H]+. In addition to [M + H]+, other species such as adducts with sodium, ammonium and potassium, as well as solvent clusters were observed. The formation of those adducts depended upon on the structure of the compound. A fragmentation of chlorogenic acids occurred at elevated temperatures yielding the constituents of the molecules (caffeic, p-coumaric and quinic acids).
authors.affiliation: Institut für Lebensmittelchemie, Technischen Universität, Braunschweig, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Kiehne
authors.forename: U H
authors.initials: UH
authors.lastname: Engelhardt
mesh_terms: D044946:Biflavonoids; D002392:Catechin / Q000031:analogs & derivatives* / Q000032:analysis*; D002726:Chlorogenic Acid / Q000032:analysis*; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D005419:Flavonoids; D013058:Mass Spectrometry / Q000379:methods; D015394:Molecular Structure; D010636:Phenols / Q000032:analysis*; D011108:Polymers / Q000032:analysis*; D059808:Polyphenols; D013056:Spectrophotometry, Ultraviolet; D013662:Tea / Q000737:chemistry*
chemical_list: D044946:Biflavonoids; D005419:Flavonoids; D010636:Phenols; D011108:Polymers; D059808:Polyphenols; D013662:Tea; C086701:thearubigin; C056068:theaflavin; D002726:Chlorogenic Acid; D002392:Catechin