Korean Journal of Food Science and Technology (한국식품과학회지)

Korean Society of Food Science and Technology (한국식품과학회)
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Quality of Freeze-Dried Yulmoo-kimchi

동결건조 열무김치의 품질

  • Ko, Young-Tae (Department of Foods and Nutrition, Duksung Women's University) ;
  • Kang, Jung-Hwa (Department of Foods and Nutrition, Duksung Women's University)
  • 고영태 (덕성여자대학교 식품영양학과) ;
  • 강정화 (덕성여자대학교 식품영양학과)
  • Published : 2003.04.01
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Abstract

Effects of freeze-drying on microbiological and sensory characteristics of yulmoo-kimchi (leaf radish kimchi) were investigated. Freeze-dried yulmoo-kimchi was stored at 0, 10 or $25^{\circ}C$ for 60 days and rehydrated with water. Optimum rehydration time of freeze-dried yulmoo-kimchi was 2 hr. Number of lactic acid bacteria of freeze-dried, 10 days-stored, rehydrated yulmoo-kimchi decreased significantly (p<0.05) in comparison with that of reference sample (non-freeze-dried yulmoo-kimchi), while no significant changes were observed after 10 days. As storage temperature increased, number of lactic acid bacteria of 10 days-stored samples decreased. pH value slightly increased by freeze-drying, while it decreased gradually during 60 days of storage. Sensory properties of freeze-dried/rehydrated sample were slightly inferior to those of reference sample, but those were relatively good when the sample was evaluated solely. Overall acceptability of freeze-dried, $0^{\circ}C$-stored, rehydrated sample was significantly inferior to reference sample (p<0.05) and it gradually decreased as storage temperature increased. Between storage periods of 10 through 60 days, sensory properties of 0 and $10^{\circ}C$-stored sample slightly decreased, while those of $25^{\circ}C$-stored sample decreased markedly.

본 연구에서는 동결건조된 열무김치를 0, 10, $25^{\circ}C$에 60일간 저장하면서 동결건조/저장/복원시료의 젖산균수, pH, 관능적특성을 관찰하여 다음과 같은 결과를 얻었다. 동결건조된 열무김치의 적정한 복원시간은 2시간이었다. 동결건조/저장/복원시료의 저장중 젖산균수는 저장 10일만에 표준시료와 비교하여 유의적으로 감소하였으며(p<0.05), 그 이후에는 큰 변화가 없었다. 한편 저장온도가 높을 수록 10일시료의 젖산균수 감소 정도가 높았다. pH는 동결건조에 의하여 다소 증가하였으나, 60일 저장기간 중에 점차 저하하는 경향을 보였다. 동결건조/복원 열무김치의 관능적특성은 표준시료(동결건조전 시료)와 비교하면 기호성이 다소 낮았으나, 동결건조/복원시료만 단독으로 시식하면 기호성이 비교적 양호하였다. 동결건조/저장/복원시료의 전반적인기호도는 $0^{\circ}C$저장시료의 경우 표준시료보다 유의적으로 낮았으며(p<0.05), 저장온도가 증가할수록 전반적인기호도도 점차로 저하하였다. 저장기간이 10일에서 60일로 연장됨에 따라 $0^{\circ}C$나 $10^{\circ}C$저장시료의 관능적 특성은 다소 저하하였으나 $25^{\circ}C$저장시료의 관능적특성은 현저하게 저하하였다.

Keywords

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