Shelf-life Study of Yukwa(Korean Traditional Puffed Rice Snack) and Substitution of Puffing Medium to Air

유과의 저장성과 팽화방법 개선시험

Yukwa(Korean traditional puffed rice snack) puffed by vegetable oil was evaluated its shelf-life and monitored its physicochemical changes during long term storage. And air puffing instead of oil was tested for substitution of puffing medium. The shelf-life of oil puffed Yukwa was less than 4 weeks at $30^{\circ}C$ by peroxide value and negligible changes in physical texture was detected after 9 weeks storge. There was a possibility to apply air puffing method for Yukwa making and its optimum temperature was around $250^{\circ}C$. Air puffed Yukwa was a little less expansion rate, same level of hardness and high brittleness compared with oil puffed . Sensory evaluation of air puffed Yukwa was as same as air puffed in odour, firmness and texture but overall taste was less score probably causing by oil used which need a impovement for air puffed Yukwa. No differences in structure of both Yukwa observed by SEM was showed.

콩기름으로 팽화시킨 유과의 저장가능 시간을 확인하고 저장 중 물리화학적 변화를 관찰하였으며 팽화매체를 대체하기 위하여 공기팽화를 시도하였다. 기름팽화 유과의 저장가능 기간은 $30^{\circ}C$에서 4주 이내였으며 9주 저장 중 조직의 물리적 변화는 미미하였다. 고온 공기에 의하여 유과의 팽화는 가능하였고 최적 팽화온도는 $250^{\circ}C$였으며, 기름팽화 유과와 비교할 때 팽화도는 떨어지나 경도는 비슷하였고 아삭아삭한 정도는 높았다. 공기팽화 유과는 기름팽화 유과에 비하여 냄새, 굳은 정도 및 조직에서 관능적인 차이가 없으나 맛은 떨어지는 결과였고 이는 기름 맛에 기인하는 것으로 보고 이의 개선이 필요하였다. 팽화된 조직의 형태는 팽화매체에 따라 차이가 없었다.