title: Three new orcinol-conjugated hydrolysable tannins from the leaves of Cleyera japonica.
abstract: Three new orcinol (3-hydroxy-5-methylphenol)-conjugated hydrolysable tannins, together with two known compounds were isolated from the leaves of Cleyera japonica (CJ), and have been tentatively named cleyeratannin A (1), cleyeratannin B (2) and cleyeratannin C (3). The chemical structures of these compounds were elucidated using 1 dimensional (1D)/2D NMR and high resolution FAB-MS, and the absolute configuration was confirmed by circular dichroism (CD). To evaluate their anti-oxidative activities, 1,1-diphenyl-2-picrylhydrazyl (DPPH)/free radical scavenging activity and nitroblue tetrazolium (NBT)/superoxide anion scavenging activity were determined.
authors: Department of Pharmacognosy, College of Pharmacy, Chung-Ang University, Seoul, Republic of Korea.
authors: Myeong Hwan
authors: MH
authors: Oh
authors: Kwan Hee
authors: KH
authors: Park
authors: Manh Heun
authors: MH
authors: Kim
authors: Han Hyuk
authors: HH
authors: Kim
authors: So Ra
authors: SR
authors: Kim
authors: Min Won
authors: MW
authors: Lee
mesh_terms: D000975:Antioxidants / Q000737:chemistry*; D016166:Free Radical Scavengers / Q000737:chemistry*; D047348:Hydrolyzable Tannins / Q000737:chemistry*; D009580:Nitroblue Tetrazolium / Q000737:chemistry; D010936:Plant Extracts / Q000737:chemistry*; D012118:Resorcinols / Q000737:chemistry*; D013481:Superoxides / Q000737:chemistry; D028242:Theaceae / Q000737:chemistry*
chemical_list: D000975:Antioxidants; D016166:Free Radical Scavengers; D047348:Hydrolyzable Tannins; D010936:Plant Extracts; D012118:Resorcinols; D013481:Superoxides; D009580:Nitroblue Tetrazolium; C005282:orcinol