A rapid identification of Radix inulae and its active component alantolactone in the Tibetan medicine Manuxitang.
This study sought to establish a more reliable method of identifying the "monarch" or principal drug Radix inulae and its active component alantolactone (AL) in the Tibetan medicine Manuxitang. Radix inulae and AL in Manuxitang were effectively identified by thin layer chromatography (TLC). AL was quantitatively determined using gas chromatography in the range of 0.1-1.0 mug/mL (r = 0.9998). The precision was 1.20% (n = 6) with an average RSD of 1.74%. Recovery was in the range of 93.5-98.5% with RSD value of 1.85%. The methods established were simple, accurate, and specific and could be used for quality control of Manuxitang. (+info)
Allelochemical, eudesmane-type sesquiterpenoids from Inula falconeri.
Sesquiterpenes and other constituents from Dendranthema zawadskii var. latilobum.
Six new germacranolides, zawadskinolides A-F (1-6), and a new eudesmane glucoside, chrysantiloboside (7) were isolated from the aerial parts of Dendranthema zawadskii var. latilobum, along with thirteen known constituents. Their structures were elucidated by means of spectroscopic evidence. Bioassay showed that flavonoids such as apigenin (9), (-)-eriodictyol (10) and nepetin (12), as well as the sesquiterpene lactone, zawadskinolide F (6), inhibited nitric oxide (NO) production in lipopolysaccharide (LPS)-stimulated RAW 264.7 macrophage cells with IC50 values of 66.15, 132.55, 35.44, and 91.32 muM, respectively. (+info)