Journal of Food Hygiene and Safety (한국식품위생안전성학회지)

The Korean Society of Food Hygiene and Safety (한국식품위생안전성학회)
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Bactericidal Effect of Bacteriocin of Lactobacillus plantarum K11 Isolated from Dongchimi on Escherichia coli O157

  • Lim, Sung-Mee (Department of Food Science & Technology, Tongmyong University) ;
  • Im, Dong-Soon (College of Pharmacy and Research Institute for Drug Development, Pusan National University)
  • Published : 2007.09.30
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Abstract

Among 68 strains of lactic acid bacteria (LAB) isolated from Dongchimi, a strain K11 was selected due to its bactericidal activity against Escherichia coli O157 The strain K11 was identified as Lactobacillus plantarum, based on physiological and biochemical characteristics. In the late exponential phase, La. plantarum K11 showed maximum bacteriocin activity (12,800 BU/mL) and maintained until the early stationary phase. The bacteriocin activity was completely inactivated by all the proteolytic enzymes such as pepsin, protease, proteinase K, papain, chymotrypsin, and trypsin, but the activity was not affected by catalase, a-amylase, lysozyme, and lipase, suggesting proteinaceous nature of the bacteriocin. Additionally, this activity was not affected in the pH range from 3.0 to 9.0 and under storage conditions like 30 days at -20,4, or $25^{\circ}C$. Although the bacteriocin activity was absolutely lost after 15 min treatment at 121, it was relatively stable at $70^{\circ}C$ for 60 min or $100^{\circ}C$ for 30 min. The activity was disappeared by treatment with acetone, benzene, ethanol, or methanol, but it was not affected by treatment with chloroform or hexane. The antibacterial activity of the bacteriocin was good against some LAB including Lactobacillus spp., Enterococcus spp., and Streptococcus spp., but not against food-borne pathogens such as Bacillus spp., Listeria spp., and Staphylococcus spp. as well as yeasts and molds. Especially, some intestinal bacteria such as Enterobacter aerogenes and E. coli were significantly affected by the bacteriocin of La, plantarum K11. Furthermore, the addition of 640 BU/mL resulted in the complete clearance of E. coli O157 after 10 hr.

동치미로부터 분리한 유산균 (68 균주) 중 Escherichia coli O157에 대한 항균 효과를 나타내는 균주는 Lactobacillus plantarum K11로 동정되었다. 분리균주 La. piantarum K11이 생산한 박테리오신의 항균 활성은 대수증식기 후반부에 12,800 BU/mL로 최대 활성에 이르렀다. 항균 활성은 pepsin, protease, proteinase K, papain, chymotrypsin 및 trypsin 처리에 의해 완전히 소실되었으나, catalase, ${\alpha}-amylase$, lysozyme 및 lipase에 의해서는 영향을 받지 않았으므로 단백질성 물질임을 확인하였다. 게다가, 이 활성은 pH 3.0-9.0의 조건하에서나 -20, 4 및 $25^{\circ}C$에서 30일간의 저장 동안에도 안정하였다. 또한 $100^{\circ}C$에서 30분간 가열처리에도 비교적 안정한 편이었고, chloroform이나 hexane 처리에도 활성에 변함이 없었다. 분리 균주의 박테리오신은 Bacillus spp., Listeria spp. 및 Staphylococcus spp. 등의 일부 식중독균의 억제효과는 나타나지 않았으나, Enterobacter aerogenes와 E. coli 등의 장내세균의 억제에는 효과적이었으며, 특히 640 BU/mL의 박테리오신 처리에 의해서 10시간 배양만에 E. coli O157이 완전하게 사멸되었다.

Keywords

References

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