Korean journal of food and cookery science (한국식품조리과학회지)

Korean Society of Food and Cookery Science (한국식품조리과학회)
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Quality Characteristics of Tarakjuk (milk-rice porridge) with different Roasting Conditions during Refrigerated Storage

볶음조건을 달리한 타락죽의 저장 시 품질의 변화

  • 이귀주 (고려대학교 사범대학 가정교육과) ;
  • 김정은 (고려대학교 사범대학 가정교육) ;
  • 김소정 (고려대학교 사범대학 가정교육과)
  • Published : 2004.08.01
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Abstract

Rice flour was roasted at different temperatures and times and tarakjuk was made from these roasted rice flours. Chemical composition, in vitro starch digestibility (IVSD) and protein digestibility (IVPD) of the roasted rice flours and tarakjuk were determined. Changes in quality characteristics such as pH, viscosity, IVSD and IVPD of tarakjuk during refrigerated storage were also investigated. For roasted rice non, the protein content ranged from 6.52∼7.13% on a dry basis, while for tarakjuk, the range was 3.74 ∼4.0%. On the other hand, the Ca level of tarakjuk ranged from 1,278.36∼1,340.87 ppm. Rice flours showed decreasing IVSD and increasing IVPD on roasting at 145$^{\circ}C$ and 165$^{\circ}C$, whereas they showed increasing IVSD and decreasing IVPD at 185$^{\circ}C$, respectively. Roasting also influenced the pH, viscosity, IVSD md IVPD of tarakjuk made from these roasted rice flours. As the roasting temperature and time increased, tarakjuk showed lower pH and viscosity, however it showed higher IVSD and IVPD. The pH of tarakjuk, except that of control, decreased with storage, whereas viscosity increased significantly. IVSD decreased up to 4 days of storage, after which it increased again until 14 days of storage. On the other hand IVPD increased up to 7 days of storage, but there was no additional significant increase after 14 days of storage. These results suggest that depending on the nutritional purpose, appropriate conditions for roasting of rice flour and storage of tarakjuk may be recommended for the commercialization of tarakjuk.

볶음 온도와 시간을 달리한 멥쌀가루와 이들로부터 제조한 타락죽의 화학 조성, in vitro 전분 분해율 (IVSD)과 in vitro 단백질 분해율(IVPD)을 측정하였다. 또한 볶음조건을 달리한 타락죽의 냉장 저장중 pH, 점도, IVSD 그리고 IVPD의 변화를 측정한 결과는 다음과 같다. 멥쌀가루의 단백질 함량은 볶음 조건에 따라서 건물당 6.52∼7.13%이었으며, 타락죽의 단백질과 Ca 함량은 각각 3.74∼4.0%, 1,278.36∼l,340.87 ppm이었다. 멥쌀가루를 145$^{\circ}C$와 1$65^{\circ}C$에서 볶음 시 IVSD는 대조구에 비해 증가를 나타내지 않았으나 185$^{\circ}C$에서는 증가하였다. 반면 IVPD는 대조구보다 유의적으로 증가한 반면, 185$^{\circ}C$에서는 유의적으로 감소하였다. 멥쌀가루의 볶음 조건은 이로부터 제조한 타락죽의 pH, 점도, IVSD 그리고 IVPD와 같은 품질특성에 영향을 주는 것으로 나타났는데, 볶음 온도와 시간이 증가함에 따라서 타락죽의 pH와 점도는 점차 감소하는 경향을 나타낸 반면, IVSD와 IVPD는 일반적으로 증가하는 경향을 나타내었다. 한편 볶음조건을 달리한 타락죽의 냉장 저장 중 품질 특성의 변화를 보면 볶음 조건을 달리한 타락죽의 pH는 대조구를 제외하고 저장 7일까지는 증가하였으나 유의적인 차이는 나타내지 않았으며, 저장 14일에는 모두 유의적으로 감소하여 pH 6.11∼6.17을 나타내었다. 한편 점도는 저장일수 가 증가함에 따라서 유의적으로 증가하여 저장 14 일에는 1,075∼4,774 cp를 나타내었다. 타락죽의 IVSD는 일반적으로 저장 4일까지는 감소하였으며, 이후 다시 서서히 증가하는 경향을 나타내어 저장14일에는 139.65∼178.34mg maltose/g을 나타내었다. 반면 IVPD는 저장 7일에는 유의적으로 증가하여 88.01∼89.28%를 나타내었으나, 저장 14일에는 더 이상의 유의적인 증가는 나타내지 않았다. 이상의 결과들은 타락죽을 제품화하는데 있어서 영양적인 목적에 따라서 멥쌀가루의 볶음과 타락죽의 저장을 위한 적합한 조건이 추천될 수 있음을 제시하고 있다.

Keywords

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