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건식 및 습식제분 흑미 쌀가루의 물리화학적 특성

Effect of Dry and Wet Millings on Physicochemical Properties of Black Rice Flours

  • 전현일 (전북대학교 응용생물공학부(농업과학기술연구소)) ;
  • 양은진 (전북대학교 응용생물공학부(농업과학기술연구소)) ;
  • 김영수 (전북대학교 응용생물공학부(농업과학기술연구소)) ;
  • 송근섭 (전북대학교 생명공학부)
  • Jun, Hyun-Il (Faculty of Biotechnology, Institute of Agricultural Science & Technology, Chonbuk National University) ;
  • Yang, Eun-Jin (Faculty of Biotechnology, Institute of Agricultural Science & Technology, Chonbuk National University) ;
  • Kim, Young-Soo (Faculty of Biotechnology, Institute of Agricultural Science & Technology, Chonbuk National University) ;
  • Song, Geun-Seoup (Division of Biotechnology, Chonbuk National University)
  • 발행 : 2008.07.31

초록

중간소재용 흑미 쌀가루 제조를 위한 조건을 검토하기 위하여 제분조건별 쌀가루의 이화학적 특성을 비교분석하였다. 흑미의 수분흡수속도상수($k_o$)는 $25^{\circ}C$에서 $0.013\;min^{-1/2}$, $35^{\circ}C$에서 $0.016\;min^{-1/2}$, $45^{\circ}C$에서 $0.018\;min^{-1/2}$로 수침온도가 높아짐에 따라 값이 증가하였고, anthocyanin 용출정도도 수침온도 상승과 수침시간 증가에 따라 크게 영향을 받았다. 일반성분과 anthocyanin의 함량은 건식쌀가루에 비해 습식쌀가루가 낮게 나타났으며 제분횟수의 증가에는 영향을 받지 않았다. 건식쌀가루의 평균 입도는 $379{\sim}288\;{\mu}m$로 습식쌀가루의 $336{\sim}253\;{\mu}m$보다 컸으며 제분횟수가 증가함에 따라 60 mesh 이상의 쌀가루 분포비율이 증가하고 쌀가루의 입도가 고르게 분포되는 경향을 보였다. 쌀가루 요오드 반응의 ${\lambda}max$$521{\sim}522\;nm$으로 제분조건에 큰 영향을 받지 않았으나, 아밀로스 함량을 제외한 전분손상도, 수분분용 해지수(WSI) 및 수분흡수지수(WAI)는 건식쌀가루보다 습식쌀가루에서 높았다. RVA 호화양상에서 습식쌀가루의 호화온도가 $46.1{\sim}46.4^{\circ}C$에 비하여 건식쌀가루는 $62.5{\sim}69.4^{\circ}C$로 훨씬 높았으며, 습식제분의 경우 제분횟수에 따른 차이가 뚜렷하게 나타나지 않았으나 건식제분에서는 5회 처리까지 호화 온도 감소 현상이 나타났다. 또한 건식 및 습식 쌀가루 모두 제분횟수가 증가하면서 trough, 최종점도 및 consistency는 감소하였고, setback과 breakdown은 건식쌀가루에서는 증가한 반면 습식쌀가루에서는 감소되는 상반된 양상을 보였다.

The physicochemical properties of black rice flours produced from dry and wet milling were carried out to investigate their applications in food processing industry. The dry milled black rice flours showed lower fat, protein, ash, and anthocyanin contents than those of wet milled black rice flours with no effect due to number of millings. Average particle sizes ($379{\sim}288\;{\mu}m$) of dry milled flours were bigger than those ($336{\sim}253\;{\mu}m$) of wet milled flours. Particles with 60 mesh or more increased with increasing milling times. Wet milled flours had higher damaged starch, water solubility index (WSI), and water absorption index (WAI) compared to dry milled flours. Pasting properties measured by rapid visco analyzer (RVA) resulted in higher pasting temperatures in dry milled flours ($62.5{\sim}69.4^{\circ}C$) than wet milled flours ($46.1{\sim}46.4^{\circ}C$). As the number of milling times increased, pasting temperature of wet milled flours were not effected. Dry and wet milling resulted in reduced trough, final viscosity, and consistency with increasing milling times.

키워드

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