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-8 and C-3-O-C-7. Their structures were elucidated by analysis of the 1D ((1)H/(13)C) 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.
journal_name
Food Chemjournal_title
Food chemistryauthors
Jia BX,Zeng XL,Ren FX,Jia L,Chen XQ,Yang J,Liu HM,Wang Qdoi
10.1016/j.foodchem.2014.01.022subject
Has Abstractpub_date
2014-07-15 00:00:00pages
31-7eissn
0308-8146issn
1873-7072pii
S0308-8146(14)00043-0journal_volume
155pub_type
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