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Gram-Positive Bacteria Specific Properties of Silybin Derived from Silybum marianum
DongGunLee,HyungKeunKim,YoonkyungPark,박성철,Eun-RhanWoo,정혜광,Kyung-SooHahm 대한약학회 2003 Archives of Pharmacal Research Vol.26 No.8
Silybin has a potent antibacterial activity, more potent than silymarin II, against gram-positive bacteria without hemolytic activity, whereas it has no antimicrobial activity against gram-negative bacteria or fungi. The mode of action of silybin against the gram-positive bacterial cell was examined by investigating the change in plasma membrane dynamics of bacterial cells using 1,6-diphenyl-1,3,5-hextriene (DPH) as a membrane probe and by assessing the inhibition of macromolecular synthesis using radiolabeled incorporation assay. The results showed that silybin inhibited RNA and protein synthesis on gram-positive bacteria.
Antioxidative Constituents from Buddleia officinalis
MeiShanPiao,Mi-RanKim,DongGunLee,YoonkyungPark,Kyung-SooHahm,Young-HeeMoon,Eun-RhanWoo 대한약학회 2003 Archives of Pharmacal Research Vol.26 No.6
Four flavonoids (1-4), a phenylethyl glycoside (5), and a phenylpropanoid glycoside (6) were isolated from the flowers of Buddleia officinalis (Loganiaceae). Their structures were determined by chemical and spectral analysis. Among the isolated compounds, luteolin (1) and acteoside (6) exhibited the most potent antioxidative activity on the NBT superoxide scavenging assay. In addition, compounds 1-6 revealed weak antifungal activity, and no hemolytic activity.