title: Alpha-glucosidase inhibitor from Bergenia ligulata.
abstract: Inhibitory compound of alpha-glucosidase activity, (+)-afzelechin (1), was isolated from rhizomes of Bergenia ligulata. The structure was identified by IR, EI-MS, (1)H and (13)C NMR spectroscopy. The ID(50) (50% inhibition dose) value of compound 1 was 0.13 mM. To investigate the structure-activity relationship, (+)-afzelechin tetraacetate (2), (+)-5,7,4'-trimethoxyafzelechin (3), (+)-tetramethoxyafzelechin (4), and (+)-3-acetyl-5,7,4'-trimethoxyafzelechin (5) as the derivatives of compound 1 were evaluated as well.
authors.affiliation: Department of Applied Chemistry, Faculty of Science and Engineering, Kinki University, Higashiosaka-shi, Osaka, Japan.
authors.forename: Junichi
authors.initials: J
authors.lastname: Saijyo
authors.forename: Yousuke
authors.initials: Y
authors.lastname: Suzuki
authors.forename: Yoshiharu
authors.initials: Y
authors.lastname: Okuno
authors.forename: Hidehiko
authors.initials: H
authors.lastname: Yamaki
authors.forename: Takuya
authors.initials: T
authors.lastname: Suzuki
authors.forename: Mitsuo
authors.initials: M
authors.lastname: Miyazawa
mesh_terms: D001578:Benzopyrans / Q000737:chemistry / Q000494:pharmacology*; D004791:Enzyme Inhibitors / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D005419:Flavonoids; D065089:Glycoside Hydrolase Inhibitors; D007004:Hypoglycemic Agents / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D010636:Phenols / Q000737:chemistry / Q000494:pharmacology*; D010946:Plants, Medicinal / Q000737:chemistry*; D027343:Rhizome / Q000737:chemistry*; D013057:Spectrum Analysis; D013237:Stereoisomerism; D013329:Structure-Activity Relationship
chemical_list: D001578:Benzopyrans; D004791:Enzyme Inhibitors; D005419:Flavonoids; D065089:Glycoside Hydrolase Inhibitors; D007004:Hypoglycemic Agents; D010636:Phenols; C510796:afzelechin