Influence of Thermal Oscillation on Quality of Frozen Foods Stored in Domestic Refrigerator

가정용 냉장고의 제상 주기와 온도 변화가 저장 식품의 품질에 미치는 영향

  • Kang, Gil-Jin (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) ;
  • Kim, Myo-Jeong (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.) ;
  • Jung, Dong-Sun (Department of Food and Microbial Technology, Seoul Women's University) ;
  • 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)
  • 강길진 (서울대학교 식품공학과, 농업생물신소재연구센터) ;
  • 어중혁 (서울대학교 식품공학과, 농업생물신소재연구센터) ;
  • 김묘정 (서울대학교 식품공학과, 농업생물신소재연구센터) ;
  • 조광연 ((주)대우전자) ;
  • 최영훈 ((주)대우전자) ;
  • 정동선 (서울여자대학교 식품미생물공학과) ;
  • 국승욱 ((주)삼림 G.F 기술연구소) ;
  • 박관화 (서울대학교 식품공학과, 농업생물신소재연구센터)
  • Published : 1996.08.30

Abstract

Effect of fluctuation range and intervals of defrosting temperature on quality of frozen foods stored in a domestic refrigerator equipped with an automatic defrost system was evaluated. As defrost system was operated, temperatures of domestic refrigerators were elevated from $-18^{\circ}C\;to\;-5^{\circ}C\;and\;-15^{\circ}C$, and fluctuation intervals were l6 hrs and 30 hrs, respectively. Quality deterioration such as protein denaturation, vitamin loss, exudate production and changes in appearance of frozen foods was minimized by reducing temperature oscillation during storage. Considerable effects of thermal oscillation on ice crystal sizes were observed for frozen beef tissue and ice cream. TTI (time temperature indicator) system also proved that the temperature control of defrost system in domestic refrigerator can improve the quality of foods during storage.

Keywords

defrosting interval;thermal oscillation;domestic refrigerator;frozen storage