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Yeast α-Glucosidase Inhibitory Phenolic Compounds Isolated from Gynura medica Leaf
The First College of Clinical Medical Science, China Three Gorges University, Yichang 443003, Hubei, China
* Author to whom correspondence should be addressed.
Received: 10 December 2012; in revised form: 16 January 2013 / Accepted: 21 January 2013 / Published: 28 January 2013
Abstract: Gynura medica leaf extract contains significant amounts of flavonols and phenolic acids and exhibits powerful hypoglycemic activity against diabetic rats in vivo. However, the hypoglycemic active constituents that exist in the plant have not been fully elaborated. The purpose of this study is to isolate and elaborate the hypoglycemic activity compounds against inhibition the yeast α-glucosidase in vitro. Seven phenolic compounds including five flavonols and two phenolic acids were isolated from the leaf of G. medica. Their structures were identified by the extensive NMR and mass spectral analyses as: kaempferol (1), quercetin (2), kaempferol-3-O-β-D-glucopyranoside (3), kaempferol-3-O-rutinoside (4), rutin (5), chlorogenic acid (6) and 3,5-dicaffeoylquinic acid methyl ester (7). All of the compounds except 1 and 3 were isolated for the first time from G. medica. Compounds 1–7 were also assayed for their hypoglycemic activity against yeast α-glucosidase in vitro. All of the compounds except 1 and 6 showed good yeast α-glucosidase inhibitory activity with the IC50 values of 1.67 mg/mL, 1.46 mg/mL, 0.38 mg/mL, 0.10 mg/mL and 0.53 mg/mL, respectively.
Keywords: Gynura medica; yeast α-glucosidase; flavonols; phenolic acids
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Tan, C.; Wang, Q.; Luo, C.; Chen, S.; Li, Q.; Li, P. Yeast α-Glucosidase Inhibitory Phenolic Compounds Isolated from Gynura medica Leaf. Int. J. Mol. Sci. 2013, 14, 2551-2558.
Tan C, Wang Q, Luo C, Chen S, Li Q, Li P. Yeast α-Glucosidase Inhibitory Phenolic Compounds Isolated from Gynura medica Leaf. International Journal of Molecular Sciences. 2013; 14(2):2551-2558.
Tan, Chao; Wang, Qunxing; Luo, Chunhua; Chen, Sai; Li, Qianyuan; Li, Peng. 2013. "Yeast α-Glucosidase Inhibitory Phenolic Compounds Isolated from Gynura medica Leaf." Int. J. Mol. Sci. 14, no. 2: 2551-2558.