%0 Journal Article
%T Stigmastane-type steroid saponins from the leaves of Vernonia amygdalina and their α-glucosidase and xanthine oxidase inhibitory activities.
%A Van PP
%A Ngo Van H
%A Quang MB
%A Duong Thanh N
%A Nguyen Van D
%A Thanh TD
%A Tran Minh N
%A Thi Thu HN
%A Quang TN
%A Thao Do T
%A Thanh LP
%A Do Thi Thu H
%A Le Tuan AH
%J Nat Prod Res
%V 38
%N 4
%D Feb-Mar 2024 16
%M 36924396
%F 2.488
%R 10.1080/14786419.2023.2188589
%X Two new vernonioside K (1) and vernonioside L (2) and four known Δ7,9(11) stigmastane-type steroidal saponins-vernonioside B2 (3), vernoniacum B (4), vernonioside B1 (5), and vernoamyoside A (6)-were isolated from the leaves of Vernonia amygdalina. Their structures were determined by comprehensive spectroscopic analysis with one-dimensional nuclear magnetic resonance, two-dimensional nuclear magnetic resonance, and high-resolution mass spectrometry. All isolated compounds (1-6) were evaluated to determine their inhibitory effects on α-glucosidase and xanthine oxidase. Among them, two new compounds 1 and 2 showed significant inhibition of α-glucosidase with IC50 values of 78.56 ± 7.28 and 14.74 ± 1.57 (μM), respectively, comparable with acarbose as a positive control (127.53 ± 1.73 μM); none of these compounds inhibited xanthine oxidase activity. Compounds 1 and 2 are promising candidates for the development of antidiabetic agents from natural sources.