Journal of Food Hygiene and Safety (한국식품위생안전성학회지)

The Korean Society of Food Hygiene and Safety (한국식품위생안전성학회)
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Antimicrobial Effect of Red Ginseng Against Major Food Poisoning Microorganisms Including Staphylococcus aureus

황색포도상구균을 포함한 식중독 미생물들에 대한 홍삼의 항균효과

  • Received : 2020.05.19
  • Accepted : 2020.07.01
  • Published : 2020.08.30
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Abstract

This study was carried out to evaluate the antimicrobial effect of red ginseng (Panax ginseng C.A. Meyer) against several foodborne pathogens including Staphylococcus aureus, Escherichia coli, Candida albicans and Aspergillus niger. The antimicrobial effect was determined by agar diffusion method using red ginseng extract, crude saponin and non-water-soluble fractions. Red ginseng extract showed antimicrobial effect against S. aureus, but not C. albicans or A. niger. The extract showed anti-bacterial activity at concentration above 30% against S. aureus, which cause both food poisoning and atophic dermatitis. Crude saponin showed antibacterial activity above 7.5% against the bacterium. However, the ginsenosides purified from crude saponin showed no antimicrobial activities at 100-200 ㎍/mL. To investigate the mode of growth inhibition, red ginseng extract and crude saponin were added to 0.85% NaCl solution containing S. aureus and then incubated at 35℃ for 12 h. The results showed that viable cells were rapidly reduced in above 10% concentration of red ginseng extract and above 2% of crude saponin, respectively. However, the crude saponin and red ginseng extract did not inhibit the bacterial cells completely at those same concentrations. On the other hand, whereas all non-water-soluble fractions showed inhibition zones above 10 mm against S. aureus, they showed no inhibition effects against E. coli, C. albicans or A. niger. The methanol fraction-1 (MF-1) showed the highest antibacterial activity against S. aureus, and the MIC (minimal inhibitory concentration) was 0.625 mg/mL. These results suggest that red ginseng extract, crude saponin and non-water-soluble fractions show selective antibacterial activity against S. aureus, and non-water-soluble fractions might be used as natural antibacterial agents.

S. aureus, E. coli, C. albicans, A. niger 등 4종의 식중독균에 대해 agar diffusion법을 이용하여 홍삼(Panax ginseng C.A.Meyer)으로 부터 조제한 홍삼농축액, 조사포닌, 비수용성 분획에 대한 항균활성을 조사하였다. 그 결과, 홍삼농축액 및 비수용성분획은 E. coli, C. albicans, A. niger에 대해서는 항균활성을 나타내지 않았고 조사포닌도 고농도인 30%를 제외한 모든 농도에서 항균활성을 나타내지 않았다. S. aureus는 Gram positive 세균으로서 화농성 식중독의 원인균이면서 동시에 아토피성 피부염의 원인균으로 알려져 있는데, 홍삼농축액은 30% 농도에서 이 균에 대해 항균활성을 나타내었고 조사포닌도 7.5%에서 항균활성을 나타내었다. 홍삼으로부터 조제한 비수용성 분획도 10~200 mg/mL 농도로 실험한 결과 모든 분획에서 항균효과를 나타내었다. 조사포닌 및 홍삼농축액의 미생물 생육저해양상을 조사하기 위해 미리 S. aureus를 접종한 0.85% 생리식염수에 농축액 및 조사포닌을 농도별로 첨가하고 35℃, 12시간 배양한 후 생균수를 측정한 결과, 홍삼농축액은 10% 이상의 농도에서, 조사포닌은 2% 이상의 농도에서 각각 균의 생육을 억제하였다. 그러나 이러한 농도에서도 생균수는 완전히 사멸되지 않아서 홍삼농축액 및 조사포닌의 S. aureus에 대한 생육억제작용은 살균작용이 아닌 정균 작용으로 추정되었다. 사포닌의 항균활성 유무를 확인하기 위해 순수 분리된 ginsenoside 6종(PT saponin, PD saponin, ginsenoside-Rb2,-Rc,-Rd,-Rf,-Rg2)의 항균활성을 50~200 ㎍/mL의 농도에서 조사한 결과 모두 항균효과가 관찰되지 않아서 ginsenoside는 S. aureus에 대해서는 항균효과가 없는 것으로 사료된다. 한편 사포닌을 제외한 비사포닌 성분인 비수용성분획에 대해 상기의 4종 병원성미생물을 대상으로 항균활성을 조사한 결과 E. coli, C. albicans, A. niger에 대해서는 항균효과가 관찰되지 않았고 S. aureus에 대해서만 선택적인 항균활성을 나타내었다. 항균활성 발현 비수용성분획 중 15% methanol분획(MF-1)이 가장 높은 항균활성을 나타내어 이에 대한 최소생육저해농도를 조사한 결과 0.625 mg/mL 이었다. MF-1 분획을 질량분석기(HPLC-MS)로 조사한 결과 주요한 활성성분은 분자량 179.55 및 187.55를 가지는 물질로 추정되었다.

Keywords

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