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Inhibition Activity Against Pathogenic Organism of Probiotic Bacteria and Characterization of Inhibition Activity of Isolated Bacteria from Calf Dejecta

Probiotic균주의 Pathogenic Organism에 대한 억제 활성과 송아지분변 분리균주의 억제활성 특성

  • 배임희 (중앙대학교) ;
  • 변정열 (중앙대학교) ;
  • 배귀석 (중앙대학교) ;
  • 이상석 (국립순천대학교) ;
  • 장문백 (중앙대학교) ;
  • 윤영호 (중앙대학교)
  • Published : 2006.12.31

Abstract

This study was conducted to investigate the inhibitory activity of Lactobacillus spp., Bacillus ssp., and calf fecal isolates against pathogenic Salmonella typhimurium, E. coli, Listeria monocytogenes, and Staphylococcus aureus. Among thirteen strains of Lactobacillus ssp. tested, Lactobacillus helveticus CU631 showed the highest inhibition against three pathogens, whereas Bacillus spp. showed a weak inhibitory activity. Four calf fecal isolates were identified as Lactobacillus pentosus CU13, CU05, Pediococcus pentosaceus CUR02, and Lactobacillus lactis ssp. lactis CUM14. The whole cell and cell wall components of L. rhamnosus CU02 and L. pentosus CU13 were active in the inhibition of L. monocytogenes. The medium components and levels, which affect on the inhibitory activity, were revealed as Tween 80 1.0%, peptone 3.0%, yeast extract 3.0%, glucose 3.0%, beef extract 3.0%, and NaCl 1.0~3.0%, respectively. Inhibitory activity of the supernatant culture medium was not affected by catalase and proteinase K treatment but affected by heat treatment at 80℃ and netralization, which implies that the inhibitory activity is due to the production of organic acids during the growth. L. pentosus CU13 and L. rhamnosus CU02 exhibited broad inhibition spectrum against 16 out of 21 strains including some pathogens. Oral administration of L. rhamnosus CU02 to the mice infected with E. coli O157:H7 was proven to be effective to recover their body weight during the experimental period.

Keywords

Inhibition activity Lactobacillus spp.;Bacillus spp.;calf dejecta isolates; Escherichia coli O157:H7

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