کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5177478 | 1380860 | 2010 | 5 صفحه PDF | دانلود رایگان |
Two new acylated flavonol pentaglycosides were isolated from the butanolic extract of Baphia nitida leaves by Sephadex LH-20 and preparative HPLC. Structural elucidation of kaempferol 3-O-β-d-xylopyranosyl(1 â 3)-(4-O-E-p-coumaroyl-α-l-rhamnopyranosyl(1 â 2))[β-d-glucopyranosyl(1 â 6)]-β-d-galactopyranoside-7-O-α-l-rhamnopyranoside (1) and kaempferol 3-O-β-d-xylopyranosyl(1 â 3)-(4-O-Z-p-coumaroyl-α-l-rhamnopyranosyl(1 â 2))[β-d-glucopyranosyl(1 â 6)]-β-d-galactopyranoside-7-O-α-l-rhamnopyranoside (2) was achieved using UV, NMR, and mass spectrometry, indicating the presence of trans or cis isomers of p-coumaric acid moiety in these novel structures. The antioxidant activity of the two compounds was assessed in the peroxynitrite assay.
Two isomers of kaempferol pentaglycosides acylated by a trans- or cis-p-coumaric acid were isolated from Baphia nitida leaves. Their structures were elucidated through analysis of spectroscopic data. The antioxidant activity of the two compounds was assessed in the peroxynitrite assay.
Journal: Phytochemistry Letters - Volume 3, Issue 2, 11 June 2010, Pages 70-74