Quản trị sản xuất và quản trị doanh nghiệp

739 tr. ; 24 cm

Tổ chức sản xuất và quản trị doanh nghiệp

739 tr.; minh họa ; 23 cm

Bioactive Withanolides from Withania obtusifolia

Seven withanolides were isolated from the leaves of Withania obtusifolia. Of these, one was new [obtusifonolide (1)], five were new to the species [sitoindoside IX (2), 6α-chloro-5β-hydroxy withaferin A (3), isowithanone (4), 2,3-dihydro-3-ethoxywithaferin A (5), and daturataturin A (6)], and one was reported previously from W. obtusifolia [withaferin A (7)]. The structures were elucidated using a set of spectroscopic and spectrometric techniques. Compounds (1-7) were evaluated for cytotoxicity against a human cancer cell panel and for antimicrobial activity in an array of bacteria and fungi. Compound 7 showed cytotoxic activity against the MDA-MB-435 (human melanoma) and SW-620 (human colon cancer) cell lines with IC50 values of 1.7 and 0.3 μM, respectively. The in vitro activity of 7 on 17β-hydroxysteroid dehydrogenase and 5α-reductase was also investigated. © 2014 Phytochemical Society of Europe