Bacteriocidal Effect of CaO (Scallop-shell powder) on Natural Microflora and Pathogenic Bacteria in Lettuce

CaO (Scallop-shell powder)를 활용한 상추 중 존재하는 자연균총 및 주요 식중독균 제어

  • Kim Il-Jin (Department of Food Science and Technology Chung-Ang University) ;
  • Kim Yong-Soo (Korea Health Industry Development Institute) ;
  • Ha Sang-Do (Department of Food Science and Technology Chung-Ang University)
  • Published : 2006.06.01

Abstract

In this study, we evaluated bacteriocidal effect of CaO (scallop shell powder) for the reduction of microorganism in lettuce, and compared with main chemical sanitizers such as chlorine, ethanol, hydrogen peroxide. As a result, the effectiveness of CaO showed dramatic reduction rate for total aerobic bacteria, Escherichia coli, Bacillus cereus, Listeria monocytogenes, Staphylococcus aureus, and Salmonella Typhimurium and were $5.9{\times}10^3,\;1.3{\times}10^5,\;5.9{\times}10^3,\;2.7{\times}10^6,\;3.6{\times}10^3,\;4.5{\times}10^3\;and\;2.6{\times}10^4$, respectively. CaO did not show better disinfecting efficiency than chlorine or hydrogen peroxide which were used as sanitizer. In Bacillus cereus case, it showed $10^6$ reduction rate, and were $10^2{\sim}10^5$ times better reduction than ethanol sanitizer. According to these results, CaO can alternate the currently used chemical sanitizers due to its natural origin as well as the effectiveness for sterilization.

본 연구에서는 천연물질 유래 살균소독제인 CaO가 깻잎 중 존재하는 자연균총, E. coli, Bacillus cereus, Listeria monocytogenes, Staphylococcus aureus, Salmonella Typhimurium에 미치는 저해효과를 알아보았고 chlorine, ethanol, hydrogen peroxide 등 주요 화학적 살균소독제와 비교하였다. 0.05% CaO 처리시 총호기성균은 $5.9{\times}10^3$, E. coli는 $1.3{\times}10^5$, B. cereus는 $2.7{\times}10^1$, L. monocytogenes는 $3.6{\times}10^3$, S. aureus는 $4.5{\times}10^3$, S. Typhimurium은 $2.6{\times}10^4$의 감소율을 보였다. 일반적으로 사용되는 살균소독제인 염소계, 과산화수소계 보다 우수한 살균효과를 보이지는 못하였으나 B. cereus의 경우에는 $10^6$ 정도의 감소율을 보여 염소 200 ppm과 대등하였고, 2%의 $H_2O_2$와 20%의 주정보다는 높은 감소율을 나타내었다. 본 연구에 따라 CaO는 기존의 화학적 살균제를 대체할 수 있는 좋은 천연물질유래 살균소독제로 활용될 수 있을 것이다.

Keywords

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