Journal of Food Hygiene and Safety (한국식품위생안전성학회지)

The Korean Society of Food Hygiene and Safety (한국식품위생안전성학회)
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Development of Predictive Models of Listeria monocytogenes in Fresh-Cut Fruits and Vegetables

신선편의 냉장·냉동 과채류에서 Listeria monocytogenes의 예측모델 개발

  • Kim, Geun Hyang (Department of Food and Nutrition, Kyung Hee University) ;
  • Lim, Ju Young (Department of Food and Nutrition, Kyung Hee University) ;
  • Kim, Yeon Ho (Department of Food and Nutrition, Kyung Hee University) ;
  • Yang, So Young (Department of Food and Nutrition, Kyung Hee University) ;
  • Yoon, Ki Sun (Department of Food and Nutrition, Kyung Hee University)
  • Received : 2020.08.20
  • Accepted : 2020.10.12
  • Published : 2020.10.30
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Abstract

Processing fresh produce into fresh-cut products increases the risk of bacterial growth and contamination by breaking the exterior barrier of produce. Our objective in this study was to develop predictive models of Listeria monocytogenes in the fresh-cut salad, fresh-cut pineapple, and frozen mango. Predictive growth and survival models were developed to predict the change of L. monocytogenes populations in the fresh-cut salad (4, 10, 12, 13, 17, 25, and 36℃), fresh-cut pineapple (4, 10, 17, 25, 30, and 36℃), and frozen mango (-2, -10 and -18℃) as a function of temperature. The growth of L. monocytogenes in fresh-cut salad and pineapple was observed at above 13℃ and 10℃, respectively. The growth of L. monocytogenes in pineapple was faster than in salad. The delta value of L. monocytogenes in frozen mango increased as the storage temperature decreased. The results indicate that L. monocytogenes behave differently according to the physicochemical properties of fresh-cut fruits and vegetables. Since L. monocytogenes grow and survive well in refrigerated and frozen conditions, management programs and preventive controls for the processing of fresh-cut produce should be effectively implemented to enhance the safety of fresh-cut fruits and vegetables at retail markets.

본 연구에서는 농산물에서 오염 가능성이 있는 병원성식중독 균 L. monocytogenes에 대해 신선편의 샐러드, 파인애플, 냉동망고에서 예측 모델을 개발하고, 본 연구에서 개발된 예측 모델을 다른 제품에서 적용 여부를 검증하였다. 시료에 L. monocytogenes를 접종하여 각각의 저장 온도에 보관 시 샐러드는 13℃, 파인애플은 10℃ 이상에서 성장하였으며, 두 식품 중 파인애플에서 L. monocytogenes가 더 빠르게 성장하는 것으로 확인 되었다. 또한, 냉동망고에 접종한 L. monocytogenes는 -2, -10, -18℃의 저장온도에서 온도가 낮아질수록 delta 값이 커지며 생존력이 높아지는 양상을 보였다. 본 실험 검증을 통해 같은 신선편의 과일, 채소 식품 그룹에 속하더라도 식품 각각의 특성에 따라 L. monocytogenes의 성장 패턴은 일정하지 않으며 각기 다른 행동 패턴을 보이는 것으로 확인하였다. 신선편의 샐러드 및 절단된 과일류는 냉장유통 되며 추가세척 없이 소비되는 제품 특성상 공정과정에서 L. monocytogenes에 의한 오염이 일어나지 않도록 위생관리에 주의하고 유통과정에서 온도 남용이 되지 않도록 유통온도 관리에도 유의해야할 것으로 사료된다.

Keywords

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