α-Glucosidase inhibitors from Chinese Yam (Dioscorea opposita Thunb.)
2010; Elsevier BV; Volume: 126; Issue: 1 Linguagem: Inglês
10.1016/j.foodchem.2010.10.100
ISSN1873-7072
AutoresLin Zhang, Bing Bai, Xiuhua Liu, Yong Wang, Mingjing Li, Dongbao Zhao,
Tópico(s)Phytochemicals and Antioxidant Activities
ResumoThe inhibitory activities of crude extracts and purified constituents from the fresh tuberous rhizomes of Chinese Yam (Dioscorea opposita Thunb.), which is commonly called Huai Shan Yao in Chinese, were evaluated against yeast α-glucosidase in order to search for the active principals for treatment of diabetes. Bioassay-guiding isolation gave four compounds: trans-N-p-coumaroyltyramine (1) (IC50 = 0.40 μM), 1,7-bis(4-hydroxyphenyl)heptane-3,5-diol (2) (IC50 = 0.38 mM), 6-hydroxy-2,4,7-trimethoxyphenanthrene (3) (IC50 = 0.77 mM) as α-glucosidase inhibitors, and cis-N-p-coumaroyltyramine (4), an isomer of compound 1, which showed no inhibitory activity against α-glucosidase. Furthermore, the separation and purification of compound 3 from Chinese Yam (Huai Shan Yao) was conducted by high-speed counter-current chromatography (HSCCC) using hexane–ethyl acetate–methanol–water (1:1:1:1, v/v/v/v). Compound 1, 2 and 4 were isolated from or detected in the Dioscoreaceae family for the first time.
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