Selective Responses of Three <i>Ginkgo biloba</i> Leaf-Derived Constituents on Human Intestinal Bacteria
作者:Hoi-Seon Lee、Min-Jeong Kim
DOI:10.1021/jf011140a
日期:2002.3.1
The selective responses of Ginkgo biloba leaf-derived materials against six intestinal bacteria was examined using an impregnated paper disk method and compared with that of bilobalide, ginkgolides A and B, kaempferol, and quercetin. The components of G. biloba leaves were characterized as kaempferol 3-O-alpha-(6'''-p-coumaroylglucosyl-beta-1,4-rhamnoside), kaempferol 3-O-(2"-O-D-glucopyranosyl)-alpha-L-rhamnopyranoside, and quercetin 3-O-alpha-(6'''-p-coumaroylglucosyl-beta-1,4-rhamnoside) by spectroscopic analysis. The growth responses varied with each bacterial strain tested. At 2 mg/disk, kaempferol 3-O-alpha-(6'''-p-coumaroylglucosyl-beta-1,4-rhamnoside) and quercetin 3-O-alpha-(6'''-p-coumaroylglucosyl-beta-1,4-rhamnoside) revealed potent inhibition against Clostridium perfringens, and kaempferol 3-O-(2"-O-beta-D-glucopyranosyl)-alpha-L-rhamnopyranoside showed a clear inhibitory effect on Escherichia coli. At 0.5 mg/disk, quercetin 3-O-alpha-(6'''-p-coumaroylglucosyl-beta-1,4-rhamnoside) showed a strong activity against C. perfringens, but weak activity was exhibited by kaempferol 3-O-alpha-(6'''-p-coumaroylglucosyl-beta-1,4-rhamnoside) against C. perfringens and kaempferol 3-O-(2"-O-beta-D-glucopyranosyl)-alpha-L-rhamnopyranoside against E coli. No inhibition was observed from treatments conducted with bilobalide, ginkgolides A and B, kaempferol, or quercetin. Furthermore, these isolated compounds did not inhibit Bifidobacterium bifidum, B. longum, B. adolescentis, or Lactobacillus acidophilus.