期刊
NATURAL PRODUCT RESEARCH
卷 22, 期 12, 页码 1074-1084出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/14786410802267494
关键词
Combretaceae; antifungal; Combretum nelsonii; triterpenes; asiatic acid; arjunolic acid
资金
- The National Research Foundation (NRF)
- National Department of Agriculture (South Africa)
Antifungal bioassay-guided fractionation of Combretum nelsonii leaf extracts afforded two closely related triterpenes, asiatic acid and arjunolic acid. Antifungal activities of the mixture of asiatic acid and arjunolic acid were determined against five fungal animal pathogens. The minimum inhibitory concentrations of the mixture to the different pathogens varied from 0.2 to 1.6 g mL(-1); Candida albicans (0.9 mu g mL(-1)), Cryptococcus neoformans (0.4 mu g mL(-1)), Aspergillus fumigatus (1.6 mu g mL(-1)), Microsporum canis (0.2 mu g mL(-1)) and Sporothrix schenckii (0.2 mu g mL(-1)). Microsporum canis and S. schenckii were the most susceptible followed by C. neoformans. Aspergillus fumigatus was the most resistant. The R-f value of the mixture of asiatic acid and arjunolic acid was 0.27 in CEF (chloroform : ethylacetate : formic acid), 0.09 (BEA; benzene : ethanol : ammonium hydroxide) and 0.55 (EMW; ethylacetate : methanol : water) which was active against all pathogens. In vitro cytotoxicity of mixture gave an LC50 of 10.58 mu g mL(-1) towards Vero monkey kidney cells.
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