Studies on the Storage of Functional Red Soybean Curd

기능성 홍두부의 저장성

  • 황태익 (순천향대학교 식품영양학과) ;
  • 김순경 (순천향대학교 식품영양학과) ;
  • 박영숙 (순천향대학교 식품영양학과) ;
  • 변광의 (순천향대학교 식품영양학과)
  • Published : 2001.12.01

Abstract

We prepared a functional red soybean curd (RS) from Ang-Khak according to various concentration (RS1 : red rice powder 0.1 g/10 mL, RS2: 0.2 g/10 mL, RS3: 0.3 g/10 mL, RS4: 0.4 g/10 mL, RS5: 0.5 g/10 mL, CS: control soybean curd). During the storage period of red soybean curd, pH, acidity, and microbial counts showed a minimum change in RS5. And in the case of color, all groups have slightly increased in yellowness except RS1. In the case of texture, hardness, gumminess, and springiness appeared to be increased for a few days and then fell down. As water drained out of soybean curd during storage at 1$0^{\circ}C$, it became so stiff and then rotten that the hardness of soybean curd increased in the early stage and then decreased after all. After a week, we could find a better preservative effect of RS than CS. Resultly, we need more efforts to prolong the shelf-life of soybean curd with applying the functionality of Ang-Khak.

홍국의 발효에 의해서 생산된 Ang-Khak을 여러 농도의 추출물(RS1: red rice powder 0.1 g/10 mL, RS2: 0.2 g/10 mL, RS3: 0.3 g/10 mL, RS4: 0.4 g/10 mL, RS5: 0.5 g/10 mL, CS: control soybean curd)로 만들어 기능성 홍두부(RS)를 제조하였다. 홍두부의 저장 중 변화에서 pH와 산도 그리고 일반 세균수에서 모두 RS5에서 가장 변화가 적었고, 색도에서는 전체적으로 황색도가 약간 증가하였으며, texture의 경우는 경도와 검성 그리고 탄성이 증가 후 감소하는 경향을 보였다. 이는 두부를 1$0^{\circ}C$에 저장하면서 초기에 수분이 빠져나가 두부의 경도가 증가된 후 부패가 진행되면서 다시 낮아진데 기인된다. 1주간 저장 후에 CS보다는 RS에서 물성의 보존이 더 잘 이루어짐을 알 수 있었으며, 홍국의 기능성을 활용하여 두부의 저장수명을 연장시키기 위한 더 많은 노력이 필요한 것으로 사료된다.

Keywords

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