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Antimicrobial Activities of Medicinal Herb Extracts

한약재추출물의 항균활성

  • Chang, Hyung-Soo (Dept. of Food and Nutrition, Sangji University) ;
  • Choi, Il (College of Life Science and Natural Resources, Sangji University)
  • 장형수 (상지대학교 식품영양학과) ;
  • 최일 (상지대학교 생명자원과학대학)
  • Received : 2011.10.20
  • Accepted : 2011.11.08
  • Published : 2012.02.29

Abstract

In this study, 18 kinds of Korean medicinal herb extracts were examined for anti-microbial activities against pathogenic microorganisms. The methanol (MeOH) extracts from Schizandra chinensis, Rhus javanica and Caesalpinia sappan exhibited antimicrobial activities against most pathogenic microorganisms at concentrations of 5 mg/mL, whereas the other 15 extracts exhibited anti-microbial activities at concentrations of 30 mg/mL. The minimum concentration at which Schizandra chinensis extracts inhibited for S. epidermidis and Bor. bronchiseptica was 0.6 mg/mL. The MeOH extracts from Schizandra chinensis, Caesalpinia sappan, Rhus javanica and Seutellaria baicalensis which had higher anti-microbial activities were subsequently fractionated using 5 different solvents, and further screened for anti-microbial activities. The inhibitory effects of ethyl acetate (EtOAc) extracts on microbial growth were greater compared to any other solvent extracts. In order to investigate the inhibitory effect of Korean medicinal herbs with high anti-microbial activities on microbial proliferation, the MeOH extracts at concentrations of 0, 100, 300 and 500 ppm were added to the media. No addition of extracts caused rapid growth of microbes after 12 hours incubation. As the concentration of extracts from Rhus javanica and Caesalpinia sappan increased, the growth-inhibiting effect on gram-positive bacteria including S. aureus, S. epidermidis, and L. monocytogenes was prominent. Rhus javanica extracts exhibited growth-inhibiting activity for gram-negative bacteria including Sal. Pullorum and Sal. Choleraesuis. The low concentration of extracts from Rhus javanica and Caesalpinia sappan exhibited the growth of Bor. bronchiseptica and E. coli serotype $O_8$. However, the higher concentration of extracts from Rhus javanica and Caesalpinia sappan exhibited a strong inhibitory effect on microbial proliferation.

본 연구에서 18종의 한약재추출물을 제조하여 병원성세균에 대한 한약재의 항균활성을 측정하였다. 오배자, 오미자 및 소목 메탄올 추출물은 대부분 균주에 대해 5 mg/mL 수준에서 항균활성을 나타냈으나 15여 종의 한약재추출물들은 30 mg/mL 수준에서 항균활성을 나타냈다. 오배자의 S. epidermidis와 Bor. bronchiseptica에 대한 최소저해농도는 0.6 mg/mL로 나타났다. 우수한 항균활성이 확인된 오배자, 소목, 오미자, 황금을 대상으로 극성이 다른 5가지 용매로 순차 분획하여 항균활성을 검토한 결과 대부분의 균주에서 EtOAc층이 다른 분획층에 비해 성장억제효과가 높게 나타났다. 항균력이 우수한 한약재추출물의 미생물 증식억제 효과를 조사하기 위해 증식배지에 0, 100, 300 및 500 ppm의 메탄올 추출물을 첨가하였다. 한약재 추출물을 첨가하지 않은 대조구에서는 12시간 이후 급격한 균의 성장을 나타내고 있으나 오배자와 소목추출물의 첨가 농도가 높을수록 그람 양성균인 S. aureus, S. epidermidis 및 L. monocytogenes는 뚜렷한 억제효과를 나타냈다. 오배자추출물은 그람음성균인 Sal. Pullorum과 Sal. Choleraesuis의 성장을 저해하였고 Bor. bronchiseptica, E. coli serotype $O_8$은 오배자와 소목추출물은 낮은 농도에서 성장이 다소 저해되었음을 보여주었고, 추출물의 농도가 높을수록 균의 성장이 강하게 억제되었다.

Keywords

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