Two new ent -kaurane-type diterpene glycosides from zucchini ( Cucurbita pepo L.) seeds
摘要:
Two new enr-kaurane diterpene glycosides; 12 alpha-(beta-D-glucopyranosyloxy)-7 beta-hydroxykaurenolide (1) and 7 beta-(beta-D-glucopyranosyloxy)-12 alpha-hydroxykaurenolide (2), a new steroid; (249-stigmasta-7,22E,25-trien-3-one (12), and known compounds (3-11, 13-14) were isolated from zucchini (Cucurbita pepo L.) seeds. The absolute structures of 1 and 2 were determined by acid hydrolysis and application of a modified Moscher's method. Furthermore, isolated compounds (1-14), and a derivative, la, were evaluated for their inhibitory effects on macrophage activation by an inhibitory assay of nitric oxide (NO) production. (C) 2015 Elsevier B.V. All rights reserved.