title: Major flavonoid components of heartsease (Viola tricolor L.) and their antioxidant activities.
abstract: Sephadex LH-20 column chromatography was used to separate flavonoid components in a heartsease methanol extract. One of the main components was identified by NMR as violanthin (6-C-glucosyl-8-C-rhamnosylapigenin). As a first approximation, the other main flavonoid component was considered to be rutin (3-O-rhamnoglucosylquercetin), based on comprehensive comparison of retention times and UV spectra of reference molecules, as well as molecular mass and fragmentation patterns obtained by mass spectrometry. The minor flavonoids were separated by polyamide column and analyzed by LC-MS. The antioxidant capacity of different flavonoid fractions was determined using both Trolox equivalent antioxidant capacity (TEAC) and 2,2-diphenyl-1-picrylhydrazyl (DPPH) in vitro antioxidant assays. The highest electron-donor capacity was found for the major flavonoid component (rutin), whereas one minor component-rich flavonoid fraction exhibited the highest hydrogen-donor activity.
authors.affiliation: Horvath Laboratory of Bioseparation Sciences, University of Innsbruck, Innsbruck, Austria.
authors.forename: Viktoria
authors.initials: V
authors.lastname: Vukics
authors.forename: Agnes
authors.initials: A
authors.lastname: Kery
authors.forename: Guenther K
authors.initials: GK
authors.lastname: Bonn
authors.forename: Andras
authors.initials: A
authors.lastname: Guttman
mesh_terms: D000975:Antioxidants / Q000737:chemistry* / Q000302:isolation & purification; D002853:Chromatography, Liquid / Q000379:methods; D005419:Flavonoids / Q000737:chemistry* / Q000302:isolation & purification; D005609:Free Radicals / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D013058:Mass Spectrometry / Q000379:methods; D015394:Molecular Structure; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013056:Spectrophotometry, Ultraviolet / Q000379:methods; D013237:Stereoisomerism; D013997:Time Factors; D032413:Viola / Q000737:chemistry*
chemical_list: D000975:Antioxidants; D005419:Flavonoids; D005609:Free Radicals