Journal of the Korean Society of Food Science and Nutrition (한국식품영양과학회지)

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Effect of Ozone and Gamma Irradiation for Eliminating the Contaminated Microorganisms in Food Materials for Kimchi Manufacturing

김치 원부재료의 오염 미생물 제거를 위한 오존 및 감마선 조사의 영향

  • Lee, Kyong-Haeng (Division of Food and Biotechnology, Chungju National University) ;
  • Cho, Chae-Min (Division of Food and Biotechnology, Chungju National University)
  • 이경행 (충주대학교 식품생명공학부) ;
  • 조재민 (충주대학교 식품생명공학부)
  • Published : 2006.08.30
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Abstract

Food materials for kimchi manufacturing were treated by ozone or gamma irradiation to reduce the number of contaminated microorganisms before the manufacturing of kimchi. Counts of total aerobic bacteria, yeast and mold were $10^6{\sim}10^7 and 10^3{\sim}10^4\;CFU/g$ in the food materials, respectively. After treatment with ozone $(3{\sim}6\;ppm), the total aerobic bacteria were reduced to 1 log cycle or more, in a dose-dependent manner. In comparison, gamma irradiation was superior to ozone treatment. Especially, irradiation of 5 kGy fully eliminated the yeast and mold attached in the food materials for kimchi manufacturing. The contents of ascorbic acid and total and reducing sugar were not affected by ozone or gamma irradiation. Taken together, it is suggested that microorganisms contaminated on materials for kimchi manufacturing could be substantially reduced by ozone (up to 6 ppm) and gamma irradiation (up to 5 kGy), without effect on the nutritional contents.

김치 원부재료에 부착된 미생물을 김치제조 전부터 감균시키고 물성변화 없이 위생화된 재료로 김치를 제조하기 위한 기초실험으로 원부재료에 오존 및 감마선 처리를 하고 이들에 의한 미생물의 변화 및 화학적 변화를 측정하였다. 김치 원부재료에 부착된 총 균수는 약 10^6{\sim}10^7\;CFU/g$ 정도였으며 효모 및 곰팡이 수는 약 10^3{\sim}10^4\;CFU/g$ 정도로 나타났다. 그러나 원부재료에 오존을 처리한 경우, 대조군에 총균수에 비하여 약 1 log cycle 정도 또는 그 이상 감소하는 경향이었으며 처리량이 클수록 다소 낮은 균수를 보였다. 원부재료에 감마선을 조사한 경우에는 오존처리군에 비하여 감균효과가 큰 것으로 나타났으며, 조사선량이 증가할수록 균수의 감소는 큰 것으로 나타났다. 효모 및 곰팡이에서도 총균수와 비슷한 경향이었으며 5 kGy의 감마선 조사시에는 원부재료에 부착되었던 효모 및 곰팡이가 검출되지 않는 것으로 나타나 감마선 조사가 김치 원부재료내 미생물들을 효과적으로 감균시키는 것으로 나타났다. 또한 원부재료에 존재하는 성분(ascorbic acid, 총당 및 환원당)의 함량 변화에서는 오존 및 감마선 조사에 의한 변화는 대조군과 비교하여 크게 차이가 없는 것으로 나타났다.

Keywords

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