초록

감초(Glycyrrhiza uralensis FISCH) 75% 에탄올 추출물이 L. monocytogenes 5 균주에 대하여 뚜렷한 항균 활성이 인정되어 용매 분획한 후 활성이 높은 에틸아세테이트 분획물을 얻었고 이를 silica gel column chromatography로 연속으로 2회 정제하여 황색 분말의 항균 활성 소획분을 분리하였다. 활성 소획분은 L. monocytogenes에 대해서는 $10{\sim}50\;ppm$ 수준에서 증식억제 효과를 보였고 50 및 100 ppm 농도에서는 살균 효과가 인정되었으며 S. aureus에 대해서는 $30{\sim}50\;ppm$ 수준에서 증식억제 효과를 보였으며 E. coli에 대해서는 100 ppm 농도에서도 증식억제 효과가 전혀 나타나지 않았다. IR, $^1H-NMR$ 및 $^{13}C-NMR$로 기기분석하여 활성 획분의 구조를 분석한 결과 감초에 함유된 flavanone 화합물의 하나인 liquiritigenin으로 동정되었다.

Abstract

The ethyl acetate fraction from ethanol extract of Glycyrrhiza uralensis FISCH showed growth inhibition on 5 strains of Listeria monocytogenes (ATCC 19111, 19112, 19113, 19114 and 15313) at $50{\sim}100\;ppm$. By silica gel column chromatography twice, antimicrobial active compound G-4-4 was isolated from ethyl acetate fraction of Glycyrrhiza uralensis FISCH. The G-4-4 fraction showed growth inhibition at $10{\sim}50\;ppm$ and confirmed bactericidal effect at 50 and 100 ppm on 5 strains of Listeria monocytogenes. Staphylococcus aureus KFCC 11764 was inhibited at $30{\sim}50\;ppm$ of G-4-4 but Escherichia coli ATCC 25922 was not inhibited at 100 ppm. The antimicrobial active substance G-4-4 was identified as liquiritigenin, a kind of flavanone compound, by IR, MS, $^1H-NMR\;and\;^{13}C-NMR$.

주제어

#Glycyrrhiza uralensis FISCH   #antimicrobial activity   #liquiritigenin  

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