Physicochemical Properties of Pigmented Rice (Suwon-415)

수원415호 유색미의 이화학적 특성

  • Lee, You-Seok (Department of Food Science and Technology & Institute of Agricultural Science and Technology,Chonnam National University) ;
  • Cho, Ji-Mi (Department of Food Science and Technology & Institute of Agricultural Science and Technology,Chonnam National University) ;
  • Rhee, Chong-Ouk (Department of Food Science and Technology & Institute of Agricultural Science and Technology,Chonnam National University)
  • 이유석 (전남대학교 식품공학과 및 농업과학기술연구소) ;
  • 조지미 (전남대학교 식품공학과 및 농업과학기술연구소) ;
  • 이종욱 (전남대학교 식품공학과 및 농업과학기술연구소)
  • Published : 2002.10.01

Abstract

Physicochemical properties and water uptake rate of pigmented rice were determined. The median and mean particle sizes of pigmented rice flour were 15.18 and $38.53\;{\mu}m$, whereas brown rice flour were 11.46 and $33.41\;{\mu}m$, respectively. Water-binding capacity, swelling power, and solubility of pigmented rice flour were higher than those of brown rice flour. X-ray diffraction patterns showed traditional A type of cereals. Moisture gain of pigmented rice kernels increased continuously up to 60 min at soaking temperature $(20{\sim}25^{\circ}C)$. Water uptake rate constants of pigmented rice during soaking at $20{\sim}25^{\circ}C$ also increased.

현미 쌀가루의 평균입경과 중심입경은 각각 $33.41\;{\mu}m$$11.46\;{\mu}m$, 유색미 쌀가루는 각각 $38.53{\mu}\;m$$15.18\;{\mu}m$로 유색미의 입경이 현미보다 더 컸다. 유색미와 현미의 물결합능력은 각각 133.19%, 112.08%로 유색미의 물결합능력이 더 높았으며 X-선 회절도에 의한 결정형은 전형적인 A형을 보였으며 상대결정도는 유색미 쌀가루와 현미 쌀가루는 각각 0.35, 0.36으로 큰 차이를 보이지 않았다. 유색미와 현미를 $20{\sim}25^{\circ}C$의 온도에서 60분 동안 침지하면서 조사한 수분흡수속도는 수침온도와 시간이 증가할수록 수분흡수량이 더 크게 나타났으며, $50^{\circ}C$에서 유색미와 현미의 수분흡수속도상수는 각각 $0.0388\;min^{-1/2}$, $0.0273\;min^{-1/2}$으로 유색미가 더 높았다.

Keywords

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