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The Effect of Fermented Extracts of Portulaca oleracea against Campylobacter jejuni

쇠비름 추출물 발효액이 Campylobacterjejuni의 증식에 미치는 영향

  • Bae, Ji-Hyun (Dept. of Food Science and Nutrition, Keimyung University)
  • 배지현 (계명대학교 식품영양학과)
  • Received : 2012.04.07
  • Accepted : 2012.05.14
  • Published : 2012.06.30

Abstract

One of the main microorganisms causing diarrheal diseases is Campylobacter jejuni. Purslane or Portulaca oleracea is an edible plant containing polyphenols that has been widely used as a folk remedy for treatment of diarrhea for a long time. This study was performed to investigate the antimicrobial activity of fermented P. oleracea extracts made with probiotics and plant-origin lactic acid bacteria(PLAB) isolated from P. oleracea against C. jejuni. Lactobacillus rhamnosus, L. acidophilus, L. bulgaricus, L. delbrueckii, L. plantarum, Leuconostoc mesenteroides and Bifidobacterium longum were applied to P. oleracea to make a fermentation broth of purslane. Leuconostoc mesenteroides and the lactic acid bacteria isolated from P. oleracea grew best in the fermentation broth of P. oleracea extracts when the broth was combined with 2% yeast extract, 1% peptone, and 0.05 to 1% potassium phosphate. The number of viable cells in the fermentation broth containing purslane extracts after 48 hours increased to $1{\times}10^{12}\;CFU/m{\ell}$ and remained at $1.3{\times}10^{10}\;CFU/m{\ell}$ after refrigeration for 2 weeks. The pH and acidity of purslane-fermented broth after 48 hours of fermentation was 3.7 and 3.14, respectively, which show that the fermentation broth was within the range of the general standards of fermented dairy products. The antimicrobial activity of the fermented P. oleracea extracts was determined using the liquid culture method. The 10 $mg/m{\ell}$ concentration of the fermented P. oleracea extract made with Leuconostoc mesenteroides and the lactic acid bacteria isolated from purslane showed the strongest antimicrobial activity against C. jejuni. The fermentation broth of purslane with the probiotics retarded the growth of C. jejuni for 48 hours at $42^{\circ}C$.

본 연구에서는 신생아 질환과 사망 원인 중 첫 번째에 해당하는 설사의 주된 원인균인 Campylbactor jejuni에 대한 쇠비름 발효액의 항균 효과를 검증해 보고자 하였다. 민간요법과 한방에서 널리 이용되어온 쇠비름은 각종 항균 효과나 항염증, 항암 효과 등이 있는 것으로 알려져 있는 식용 식물로, 여기에서 식물성 유산균을 분리해 각종 프로바이오틱스와 더불어 쇠비름 발효액을 제조하였다. Lactobacillus rhamnosus, L. acidophilus, L. bulgaricus, L. delbrueckii, L. plantarum, Leuconostoc mesenteroides 및 Bifidobacterium longum과 쇠비름에서 분리한 균을 쇠비름 추출물에 적용하였을 때, Leuconostoc mesenteroides와 쇠비름에서 분리한 식물성 유래 유산균이 쇠비름 추출액에서 가장 잘 자랐고, 여기에 2% yeast extract, 1% peptone 및 0.05~1% 인산을 첨가하였을 때 가장 적합한 발효액을 만들 수 있었다. 쇠비름 발효액에 들어있는 생균수는 발효 48시간 후 $1{\times}10^{12}\;CFU/m{\ell}$로 증가하였고, 2주간 냉장 보관을 한 이후에도 생균수가 $1.3{\times}10^{10}\;CFU/m{\ell}$로 남아있었다. 쇠비름 발효액의 pH와 산도는 발효 48시간 이후 3.7과 3.14로 각각 나타나 일반 유제품 발효액의 기준 범위 안에 들어감을 알 수 있었다. PLAB과 Leuconostoc mesenteroides로 만든 쇠비름 발효액은 10 $mg/m{\ell}$ 이상의 농도에서 C. jejuni에 대해 증식 억제효과를 나타냈으며, 이 억제 효과는 48시간 동안 지속되었다.

Keywords

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