期刊
PHYTOCHEMISTRY LETTERS
卷 16, 期 -, 页码 121-128出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.phytol.2016.03.011
关键词
Rhynchospora corymbosa; Triterpene; Flavone glucoside; Antimicrobial activity; Antityrosinase activity; Antibutyrylcholinesterase activity
资金
- TWAS-ICCBS Postgraduate Fellowship Program
- University of Dschang
The CH2Cl2-MeOH (1:1) extract of the whole plant of Rhynchospora corymbosa (L.) Britton, led to the isolation of two new secondary metabolites 1, 2 (1 and 2a) together with nine known compounds 3-11. The flavone named tricin (11) was partially modified by esterification reaction to three semi-synthetic derivatives 11a-11c). Their structures were elucidated on the basis of spectroscopic analysis. The antimicrobial, tyrosinase and butyrylcholinesterase inhibitory activities revealed that, extract and compounds 1, 2a, 6, 11, 11a-c exhibited variable MICs (1-512 mu g/mL) and significant antimicrobial activity, depending on the microbial species; Antifungal activity of 11 and 11c was more important than that of nystatine used as reference antifungal drugs. The inhibitory activity of 4 (IC50 = 43.28 mu g/mL) was higher than that of the kojic acid (IC50 = 49.62 mu g/mL) which is known tyrosinase inhibitor. The extract, compounds 1, 7-10, and 11a-c exhibited significant (p < 0.05) differences in the concentrations of 50% BuChE inhibition (IC50). These results suggest that the, R. corymbosa could be exploited as a potential source of natural antimicrobial, and antibutyrylcholinesterase agents as well as tyrosinase inhibitors. (C) 2016 Phytochemical Society of Europe. Published by Elsevier B.V. All rights reserved.
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