Phytol, isolated from Aster yomena, is widely distributed as a constituent of chlorophyll. In the present study, we confirmed the antibacterial activity of phytol and its mechanism inducing oxidative cell death in Pseudomonas aeruginosa. In phytol-treated cells, elevated level of intracellular
Apigenin is a naturally occurring flavone isolated from the medicinal herb, Aster yomena. The present study was designed to elucidate the apoptosis-like antibacterial mechanism of apigenin in Escherichia coli. Administration of apigenin resulted in a rapid increase in intracellular calcium
Four new labdane-type rhamnopyranosides derived from 13-epimanool, compounds 1-4, with differently acetylated sugar moieties, were isolated from A. veitchianus. Their structures and absolute configurations were elucidated by chemical transformation, spectroscopic and mass-spectrometric analyses (IR,
A new diterpene glycoside 1 was isolated from the whole plant of Aster homochlamydeus Hand-mazz (Compositae), along with four known diterpene glycosides 2-5. Their structures were elucidated by spectroscopic methods, MS, IR, NMR and X-raycrystallographic analyisis. Antibacterial activity of
Two new pentacyclic triterpenoids, 2beta,3beta,16alpha-trihydroxyl-24alpha-al-olean-12-en-28-oic acid (1), 2beta,3beta-dihydroxyl-16-O-beta-D-glucopyranose-24alpha-al-olean-12-en-28-oic acid (2) and two known pentacyclic triterpenoids were isolated from the roots of Aster ageratoides var. pilosus.
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