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Inhibitory effects of Rosa gallica on the digestive enzymes
Sarangowa Ochir1, Makoto Nishizawa, Byoung Jae Park
1Kitami Institute of Technology, 165 Koen-cho, Kitami 090-8507, Japan.
Abstract:
The 50% aqueous ethanol extracts of petals of Rosa gallica collected in Xinjiang province, China, exhibited potent inhibitory effects against alpha-amylase and alpha-glucosidase. As the active principles, seven hydrolysable tannins were isolated from this species for the first time and elucidated by NMR and ESI-TOF-MS analysis. Quantitative analysis by ultra-performance liquid chromatography demonstrated that the contents of these hydrolysable tannins were 3-5% of the dry weight of the petals, and the hydrolysable tannins must be related to the medicinal utilization of this species.
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