The Physicochemical Characteristics of Rice Flour with Different Milling Degree of Rice Cultivar "Deuraechan"

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.

드래찬 쌀 품종의 도정도를 달리한 쌀가루의 이화학적 특성

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.