Acylated flavonol pentaglycosides from Baphia nitida leaves

作者：Chaabi Mehdi; Chabert Philippe^*; Vonthron Senecheau Catherine; Weniger Bernard; Ouattara Modibo; Corstjens Hugo; Sente Ilse; Declercq Lieve; Lobstein Annelise

来源：Phytochemistry Letters, 2010, 3(2): 70-74.

DOI：10.1016/j.phytol.2009.12.002

• Baphia nitida
• Fabaceae
• Acylated kaempferol pentaglycosides

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-beta-D-xylopyranosyl(1 -> 3)-(4-O-E-p-coumaroyl-alpha-L-rhamnopyranosyl(1 -> 2))[beta-D-glucopyranosyl(1 -> 6)]-beta-D-galactopyranoside-7-O-alpha-L-rhamnopyranoside (1) and kaempferol 3-O-beta-D-xylopyranosyl(1 -> 3)-(4-O-Z-p-coumaroyl-alpha-L-rhamnopyranosyl(1 -> 2))[beta-D-glucopyranosyl(1 -> 6)]-beta-D-galactopyranoside-7-O-alpha-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.

• 出版日期2010-6-11