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Monitoring of Quality Characteristics of Danmooji Product Storage Temperatures for Storage Temperature Establishment

단무지 제품의 보관온도 설정을 위한 저장 온도별 품질 특성

  • Jung, Hyeon A (Dept. of Herbal Cuisine and Nutrition, Daegu Haany University) ;
  • Park, Chan Sung (Dept. of Herbal Cuisine and Nutrition, Daegu Haany University) ;
  • Park, Suk Hyeon (Dept. of Herbal Cuisine and Nutrition, Daegu Haany University)
  • 정현아 (대구한의대학교 한방식품조리영양학부) ;
  • 박찬성 (대구한의대학교 한방식품조리영양학부) ;
  • 박숙현 (대구한의대학교 한방식품조리영양학부)
  • Received : 2012.09.11
  • Accepted : 2012.11.19
  • Published : 2012.12.30

Abstract

In this study, danmuji samples stored at 5 and $25^{\circ}C$ were examined for three weeks to observe the changes in the color, property of matter, and microorganisms of danmuji, and its sensory properties, during its storage. The difference in the brightness and redness of danmuji and danmuji filtrate as their storage period became longer was not big but was significant, and their yellowness decreased following storage at both 5 and $25^{\circ}C$. The hardness of the danmuji sample stored at $5^{\circ}C$ showed the greatest value at day 7 while that of the danmuji sample stored at $25^{\circ}C$ showed the greatest value at day 14. It was found in the examination of the total cell number of the stored danmuji that the total cell number was $10^5CFU/g$, with almost no change, but in the case of the danmuji filtrate, the cell number increased from the latter part of the storage. The number of yeast fungi increased until storage day 7 for both the danmuji sample stored at $5^{\circ}C$ and that stored at $25^{\circ}C$. The cell number of danmuji did not change since then while the cell number of the danmuji filtrate constantly increased. As for the sensory properties of each stored danmuji, the overall taste preference was highest at storage days 14 and 21 ($5^{\circ}C$), and the overall scent preference was high for the danmuji that had been stored for 7 days ($5^{\circ}C$), but there was no significant difference. The texture and color of and the overall preference for the danmuji stored at $25^{\circ}C$ significantly decreased as the storage period got longer. All in all, the preference for the danmuji stored at $5^{\circ}C$ was higher than that for the danmuji stored at $25^{\circ}C$, although there was no significant difference. Thus, it is thought that $5^{\circ}C$ is more appropriate than $25^{\circ}C$ as the storage temperature of danmuji products.

단무지는 단체급식 및 외식업체에서 소비되는 부식재료로 소비량이 점점 늘어나고 있는 추세이다. 더운 여름철 상온에서 대량 소비처로 운반되는 단무지의 경우 미생물에 의한 부패와 효소작용에 의한 연화현상은 단무지 생산자들에게 해결해야할 가장 큰 문제가 되고 있다. 따라서 향후 소비가 더욱 증가될 것으로 예상되는 단무지에 대한 품질개선 방안을 마련하기 위한 기초자료로 활용하고자 포장된 단무지 제품의 저장온도에 따른 품질변화와 특성을 비교하였다. 단무지의 저장 중 색도, 물성, 미생물 변화와 관능적 특성을 알아보기 위하여 $5^{\circ}C$$25^{\circ}C$의 저장온도로 각각 나누어 3주간 조사 하였다. 단무지와 단무지 여액의 명도와 적색도는 저장기간이 길어짐에 따라 큰 차이는 없었지만 유의적으로 나타났으며, 황색도의 경우 $5^{\circ}C$$25^{\circ}C$ 모두 저장기간에 따라 감소하는 경향을 나타냈다. 단무지의 Hardness는 $5^{\circ}C$의 경우 7일에서 가장 큰 값을 나타냈고, $25^{\circ}C$의 경우는 14일에서 가장 큰 값을 나타냈다. 저장기간 중 단무지의 총 균수를 조사한 결과 저장기간 동안 $10^5CFU/g$로 거의 균수변화가 없었지만, 단무지 여액의 경우 저장후기부터 균수가 늘어났다. 효모곰팡이 수는 단무지의 경우 $5^{\circ}C$, $25^{\circ}C$ 모두 저장 7일까지는 증가하다가 단무지의 균수는 이후 변화가 없었고 단무지 여액의 균수는 계속 증가 하였다. 단무지 저장별 관능적 특성은 맛의 전체적 기호도는 저장 14, 21일($5^{\circ}C$)에서 가장 높았으며, 향의 전체적 기호도는 저장 7일($5^{\circ}C$)에 보관한 단무지가 높았으나 유의적 차이는 없었다. $25^{\circ}C$에 보관한 단무지의 Texture, Color 기호도는 저장기간이 길어짐에 따라 유의적으로 감소하였고(p<0.05), $25^{\circ}C$에 보관한 단무지의 전체적 기호도는 저장기간이 길어짐에 따라 유의적으로 감소하였다(p<0.05). 전체적으로 $5^{\circ}C$에 보관한 단무지의 기호도가 유의적 차이는 없었지만 $25^{\circ}C$에 보관한 단무지의 기호도보다 높게 나타나 단무지 제품의 보관온도는 $25^{\circ}C$보다는 $5^{\circ}C$가 적합하다고 사료된다.

Keywords

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