The alpha-glucosidase inhibitory activities of bergenin derivatives were evaluated. Bergenin derivatives were synthesized from bergenin which is a characteristic compound of B. ligulata. A new bergenin derivative, 11-O-(3',4'-dimethoxybenzoyl)-bergenin showed the highest potent inhibitory activity among those of bergenin derivatives. The presence of substituents at 3',4'-position in bergenin derivatives altered the alpha-glucosidase inhibitory activity. 11-O-(3', 4'-dimethoxybenzoyl)-bergenin was noncompetitive inhibitor for alpha-glucosidase. The present study reveals that bergenin derivatives could be classified as a new group of alpha-glucosidase inhibitors.
Synthesis and biological evaluation of bergenin analogues as mushroom tyrosinase inhibitors
作者:Yusei Kashima、Mitsuo Miyazawa
DOI:10.1007/s12272-012-0903-3
日期:2012.9
the standard tyrosinase inhibitors of arbutin (IC50 value = 221.8 ± 1.9 μM) and kojic acid (IC50 value = 46.6 ± 3.8 μM). The bergenin moiety, the ester linkage, and benzoic acid moiety of bergeninderivatives affected two biologic activities. Tyrosinase inhibitory activity was affected by substituents of benzoic acid moiety. This manuscript provides a good foundation for the design and development of