期刊
NATURAL PRODUCT RESEARCH
卷 37, 期 8, 页码 1284-1291出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/14786419.2021.2003355
关键词
Lichen; Parmotrema indicum Hale; indicuen; triterpene; alpha-glucosidase inhibition; cytotoxicity
In this study, a new hopane-type triterpene, indicuen (1), along with eight known compounds (2-9) were isolated from the lichen Parmotrema indicum Hale. The chemical structures of these compounds were determined by spectroscopic data, DFT-NMR chemical shift calculations, and comparison with literature. Compounds 1, 5, and 7 showed moderate inhibitory activity against alpha-glucosidase.
One new hopane-type triterpene, indicuen (1), along with eight known compounds (2-9) were isolated from the n-hexane extract of the lichen Parmotrema indicum Hale. The chemical structures of isolated compounds were identified by interpretation of their spectroscopic data (1D, 2D NMR and HRESIMS) combined with DFT-NMR chemical shift calculations and subsequent assignment of DP4+ probabilities and by comparison with the literature. Indicuen represents for a rare hopane bearing a 1-carboxyethyl substituent at C-21 in lichens. Compounds 1-3 and 5-8 were evaluated for alpha-glucosidase inhibition and cytotoxicity against K562 and HepG2 cancer cell lines. Compounds 1, 5 and 7 exhibited moderate alpha-glucosidase inhibition with IC50 values of 201.1, 156.3 and 187.4 mu M, respectively. Compound 1 also showed weak cytotoxicity toward K562 cell line while others showed no activity.
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