Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7597883 | Food Chemistry | 2014 | 7 Pages |
Abstract
Baeckea frutescens is an aromatic shrub used in South China as an ornamental and as a spice. Four unusual C-methylated biflavonoids named baeckeins F-I (1-4) were isolated from the roots of B. frutescens. The baeckeins F-I possessed a unique carbon skeleton, a flavonol conjugated with a coumaronochromone molecule via the unusual linkages of C-2-C-8â and C-3-O-C-7â. Their structures were elucidated by analysis of the 1D (1H/13C) and 2D NMR (HSQC/HMBC/NOESY) and HR-ESI-MS spectroscopic data, and the absolute stereochemistry for chiral carbons of C-2 and C-3 was established by CD spectrometry combined with quantum chemical calculations. Baeckeins F-I (1-4) were also evaluated for their anti-inflammatory activities by detecting the NO production of LPS-induced RAW264.7 murine macrophage cell line; baeckein I (4) with the β-d-glucose unit and configuration of (2R,3R) exhibited the highest NO inhibitory activity (IC50 = 15.2 μM), which was similar to that of the positive control indomethacin.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Bei-Xi Jia, Xian-Lei Zeng, Feng-Xiao Ren, Lu Jia, Xiao-Qing Chen, Jie Yang, Hong-Min Liu, Qiang Wang,