Abstract

This study investigated the physicochemical characteristics of processing type rice (Deuraechan) with brown rice and brown rice milling different yields (97.4, 96.0, 94.4 and 92.0%). In the results of proximate composition of rice flours with the different milling degrees, moisture contents were 12.92~13.07%, crude protein contents were 6.62~8.47%, crude lipid contents were 0.84~2.52%, crude ash contents were 0.51~1.17%, and crude fiber contents were 0.30~1.16%. The moisture contents were not significantly different. In the results of Hunter's color value of rice flours, L value was the highest in white rice, and a and b values were the highest in brown rice. Water binding capacity of rice flours was the highest in white rice 127.44%, but brown rice was the lowest 114.31%. As for amylogram properties, brown rice was the highest in the initial pasting temperature and temp. at maximum viscosity. However, white rice was the highest in maximum viscosity, viscosity at $50^{\circ}C$, breakdown and setback. In the results of different scanning calorimeter thermal properties of rice flours, brown rice was the highest in onset temperature, peak temperature and end temperature. The enthalpy (${\delta}H$) was the lowest in brown rice flour and the highest in white rice flour.

본 연구는 가공용 쌀의 활용을 위한 기초자료를 마련하고자 초다수성 가공용 쌀인 드래찬을 현미, 3분도미, 5분도미, 7분도미, 백미로 각각 도정하여 쌀가루의 이화학적 특성을 분석하였다. 도정도에 따른 드래찬 쌀의 수분 함량은 12.92~13.07%, 조단백 함량은 6.62~8.47%, 조지방 함량은 0.84~2.52%, 조회분 함량은 0.51~1.17% 그리고 조섬유 함량은 0.30~1.16%로 나타났으나, 수분 함량에서는 유의한 차이가 없었다. 쌀가루의 색도에서 L값은 88.08~93.72로 백미에서 가장 높았고, a값과 b값은 현미에서 가장 높았다. 쌀가루의 수분결합력은 백미가 127.44%로 가장 높았고, 현미가 114.31%로 가장 낮았다. Amylogram 호화특성에서는 백미가 최고점도, 냉각점도, breakdown 및 setback에서 가장 높게 나타났다. 시차열량 주사계에 의한 호화엔탈피 측정 결과, 호화개시온도는 $63.49{\sim}65.75^{\circ}C$이고, 호화정점온도는 $70.72{\sim}73.10^{\circ}C$, 호화종료온도는 $77.99{\sim}79.58^{\circ}C$이었고, 호화엔탈피는 현미에서 9.98 J/g으로 가장 낮게 나타났다.

Keywords

• rice flour;
• milling degree;
• physicochemical characteristics;
• Deuraechan