title: Antioxidant flavonoids and chlorogenic acid from the leaves of Eriobotrya japonica.
abstract: The antioxidant activity of Eriobotrya japonica was determined by measuring the radical scavenging effect on DPPH (1,1-diphenyl-2-picrylhydrazyl) radical and lipid peroxidation produced when mouse liver homogenate was exposed to the air at 37 degrees C, using 2-thiobarbituric acid (TBA). The methanol extract and its fractions of Eriobotrya japonica leaves showed strong antioxidant activity. The antioxidant activity of EtOAc and n-BuOH soluble fractions were stronger than the others, and were further purified by repeated silica gel, MCl gel CHP-20P, and Sephadex LH-20 column chromatography. Antioxidant chlorogenic acid, quercetin-3-sambubioside from n-BuOH fraction, and methyl chlorogenate, kaempferol- and quercetin-3-rhamnosides, together with the inactive ursolic acid and 2 alpha-hydroxyursolic acid from EtOAc fraction were isolated. Antioxidant flavonoids and chlorogenic acid also showed prominent inhibitory activity against free radical generation in dichlorofluorescein (DCF) method.
authors.affiliation: Department of Food and Life Science, Pukyung National University, Pusan, Korea.
authors.forename: H A
authors.initials: HA
authors.lastname: Jung
authors.forename: J C
authors.initials: JC
authors.lastname: Park
authors.forename: H Y
authors.initials: HY
authors.lastname: Chung
authors.forename: J
authors.initials: J
authors.lastname: Kim
authors.forename: J S
authors.initials: JS
authors.lastname: Choi
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000302:isolation & purification / Q000494:pharmacology*; D002726:Chlorogenic Acid / Q000302:isolation & purification / Q000494:pharmacology*; D005419:Flavonoids / Q000302:isolation & purification / Q000494:pharmacology*; D016166:Free Radical Scavengers / Q000494:pharmacology; D051379:Mice; D010946:Plants, Medicinal / Q000737:chemistry*
chemical_list: D000975:Antioxidants; D005419:Flavonoids; D016166:Free Radical Scavengers; D002726:Chlorogenic Acid