Effects of Temperature and Fluctuation Range on Microbial Growth and Quality of Foods Stored in Domestic Refrigerator

냉장실의 온도 정온화가 냉장 식품의 품질과 미생물의 생육에 미치는 영향

  • Jung, Dong-Sun (Department of Food and Microbial Technology, Seoul Women's University) ;
  • Kweon, Mee-Ra (Department of Food Science and Technology and Research Center for New Bio-materials in Agriculture, Seoul National University) ;
  • Auh, Joong-Hyuck (Department of Food Science and Technology and Research Center for New Bio-materials in Agriculture, Seoul National University) ;
  • Cho, Kwang-Yeun (Dawoo Electronic Co. Ltd.) ;
  • Choi, Young-Hoon (Dawoo Electronic Co. Ltd.) ;
  • Kook, Seung-Uk (R&D Center, Samlip G.F Co. Ltd.) ;
  • Park, Kwan-Hwa (Department of Food Science and Technology and Research Center for New Bio-materials in Agriculture, Seoul National University)
  • 정동선 (서울여자대학교 식품미생물공학과) ;
  • 권미라 (서울대학교 식품공학과, 농업 생물신소재연구센터) ;
  • 어중혁 (서울대학교 식품공학과, 농업 생물신소재연구센터) ;
  • 조광연 ((주)대우전자) ;
  • 최영훈 ((주)대우전자) ;
  • 국승욱 ((주)삼립 G.F 기술연구소) ;
  • 박관화 (서울대학교 식품공학과, 농업 생물신소재연구센터)
  • Published : 1996.08.30

Abstract

Effects of refrigeration temperature and its fluctuation range on the growth of psychrotrophic microorganisms and the quality of refrigerated foods such as apple, fish and oyster were evaluated to find optimum storage conditions for a domestic refrigerator. Refrigeration temperature was $2^{\circ}C$ or $4^{\circ}C$, and fluctuation ranges were varied: ${\pm}0.3,\;{\pm}1.0,\;{\pm}1.2,\;or\;{\pm}4.0^{\circ}C$. Changes in hardness of apples stored at $2{\pm}0.3^{\circ}C$ were much slower than those of apples stored at $4{\pm}1.2^{\circ}C$. Freshness of fish and oyster also lasted much longer at low temperature such as $2{\pm}0.3^{\circ}C$. The growth of Listeria monocytogenes inoculated on sliced ham was inhibited for 1 month at $2{\pm}0.3^{\circ}C$, but the cells at $4{\pm}1.2^{\circ}C$ began to grows as time elapsed. Therefore, it was expected that shelf-life of certain food stored in a domestic refrigerator could be extended by lowering temperature to $2^{\circ}C$ and by reducing fluctuation range of refrigerator.

Keywords

Listeria monocytogenes;storage temperature;temperature fluctuation;domestic refrigerator