Abstract
To screening of antimicrobial activity, 95% ethanol and hot water extracts of roots, fruits, leaves, radix and stems of 50 species of traditional herbal medicines were examined. For their growth inhibitory effects on two food-born microorganisms, S. aureus and E. coli O157:H7, by the paper disc diffusion method and the minimum inhibitory concentration(MIC) test. Moutan radicis Cortex and Achyranthis Radix showed the highest inhibitory activities on both S. aureus and E. coli O157:H7. The Inhibition zones of Moutan radicis Cortex on S. aureus and E. coii O157:H7 were 22 mm and 24 mm respectively, and the corresponding inhibition zone of Achyranthis Radix were 23 mm and 22 mm. The MIC or Achyranthis Radix on S. aureus was 156.25 $\mu$g/mL, and the MIC or Achyranthis Radix and Moutan radicis Cortexas on E. coli O157:H7 were 625 $\mu$g/mL and 312.5 $\mu$g/mL, respectively. Their antimicrobial activities in ethanolic extracts were significantly higher than in hot water extracts. In the various solvent fractions prepared from ethanol extract, the ethyl acetate fraction of Achyranthis Radix and the CHCl$_3$ fraction of Moutan radicis Cortexas showed strongest activity.
50가지 생약재를 95% 에탄올과 물추출하여 식중독 세균인 S. aureus와 E. coli O157:H7에 대한 항균활성을 조사하였다. 한천배지확산법에 따른 생육저해효과를 측한 결과, S. aureus 에 대하여 우슬>목단피>지실>황백, 건강, 민들레 순으로, E. coli O157:H7에 대하여 목단피>우슬>건강>지실, 황백 순으로 활성을 나타내었다. MIC는 S. aureus에 대하여 우슬이 156.25 $\mu$g/mL, 목단피와 황백이 625 $\mu$g/mL로 나타났으며, E. coli O157:H7에 대하여 우슬과 목단피의 MIC는 각각 625, 312.5 $\mu$g/mL로 높은 항균력을 나타내었다. 가장 높은 활성을 보인 우슬과 목단피를 용매분획(hexane, CHC1$_3$, ethyl acetate, butanol)하여 한천배지 확산법에 의한 두 균에 대한 생장저해 효과를 측정하였다. 우슬은 ethyl acetate 분획물에서, 목단피는 CHC1$_3$과 ethyl acetate 분획물에서 각각 높은 활성을 나타내었다.