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Use of Freshness Indicator for Determination of Freshness and Quality Change of Chicken during Storage

신선도표시계를 이용한 계육의 저장 중 신선도 측정 및 품질변화

  • Shin, Hee-Young (Dept. of Food Science & Technology, Chungnam National University) ;
  • Ku, Kyoung-Ju (Dept. of Food Science & Technology, Chungnam National University) ;
  • Park, Sang-Kyu (Gwangju Institute of Science and Technology) ;
  • Song, Kyung-Bin (Dept. of Food Science & Technology, Chungnam National University)
  • Published : 2006.07.31

Abstract

To determine freshness and quality change of chicken products during storage, we manufactured freshness indicator and monitored the surface pH, volatile basic nitrogen (VBN), thiobarbituric acid reacted substance (TBARS), total bacterial counts, electronic nose analysis, and sensory evaluation. All chicken products (drum, wing, thigh) had a change in color of freshness indicator after storage of 3 days at $4^{\circ}C$, indicating poor quality at the time. VBN, TBARS values, and total bacterial counts reached the decay point at the time of color change of freshness indicator attached to the surface of chicken samples. The sensory evaluation also indicated sample was not acceptable by off-odor at day 4 of storage. According to electronic nose analysis to examine off-odor, there were significant differences in terms of principal component analysis values among chicken samples of day 0, day 3, and day 5 of storage. These results suggest that freshness indicator should be useful in determining expiration date of chicken products during marketing by indicating the microbial safety as well as physicochemical and sensory change.

계육의 신선도를 판정할 수 있는 신선도표시계를 제작하였고, 냉장저장 중 계육의 신선도 및 품질변화를 측정하고자 저장 중 표면 pH, VBN, TBARS, 총균수, 전자코 측정 및 관능검사를 수행하였다. 저장 중 계육의 모든 부위는 저장 3일 경과 후 신선도표시계의 색의 변화로 신선도가 저하되었음을 제시해주었다. 저장 중 품질변화를 측정한 결과 신선도표시계의 반응시점과 같은 저장 3일에 VBN, TBARS, 총균수의 값 또한 부패시점에 도달하였고, 관능검사 결과도 저장 4일 이후에는 이취 및 표면에 점질물 생성 등으로 가식이 불가능하였다. 부패취를 확인하기 위해 실시한 전자코 분석에서도 저장 0일차, 저장 3일차, 저장 5일차의 향기분석에서 주성분 분석값이 뚜렷한 차이를 보여 계육 부패시점이 3일이라는 것을 확인할 수 있었다. 따라서 신선도표시계인 신선도표시계는 계육의 저장 중 신선도 확인을 실시간으로 해줌으로써 계육의 유통기한 확립 측면에서 매우 유용한 장치가 될 것으로 판단된다.

Keywords

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