ABSTRACT
Objective To study the chemical constituents of the whole plant of Pholidota yunnanensis and to examine the inhibitory effects of the isolated compounds on nitric oxide(NO) production in activated rat macrophage-like cell line(RAW 264.7).Methods Various chromatographic techniques were used to separate and purify the constituents,and their structures were elucidated on the basis of spectroscopic analysis. The inhibitory effects of these compounds on NO production in RAW 264.7 cells of rats activated by lipopolysaccharide(LPS) and interferon-?(IFN-?) were tested in vitro by microplate ultraviolet-colorimetric method.Results Seven compounds were isolated and identified as trans-3,3′,5-trihydroxy-2′-methoxystilbene(Ⅰ),cis-3,3′-dihydroxy-5-methoxystilbene(Ⅱ),trans-3,3′, 5-trihydroxystilbene(Ⅲ),3,3′-dihydroxy-5-methoxybibenzyl(batatasin-Ⅲ,Ⅳ),3,4′-dihydroxy-3′,5-dimethoxybibenzyl(gigantol,Ⅴ),3,3′,5-trihydroxybibenzyl(Ⅵ),2,7-dihydroxy-4-methoxy-9,10-dihydrophenanthrene(coelonin,Ⅶ).Conclusion Compounds Ⅱ,Ⅳ,and Ⅵ show favorable inhibitory effects on NO production,compounds Ⅰ and Ⅱ are new compounds,and compounds Ⅲ-Ⅶ are isolated from this genus for the first time.