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Protective effect of a new amide compound from Pu-erh tea on human micro-vascular endothelial cell against
Liang Zhang1, Zhi-Zhong Ma, Yan-Yun Che
1State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University Health Science Center, Beijing 100191, PR China.
Abstract:
A new amide, N-(3,4-dihydroxybenzoyl)-3,4-dihydroxybenzamide (1), was isolated from the Pu-erh tea made with the leaf of Camellia assamica (Mast.) Chang by special fermentation techniques with bacteria and fungus. Its structure was established by means of spectroscopic data analyses, including mass spectrometry and both 1D and 2D NMR spectroscopy. Human micro-vascular endothelial cell (HMEC) injured with H(2)O(2) was used as the model to test protective effect of compound 1 in contrast with other known compounds isolated from Pu-erh tea. These results suggested that compound 1 is a very useful compound to prevent H(2)O(2)-induced cell death of HMEC.
