A Kinetic Study on the Hydration Process of Barley Kernels with Various Polishing Yields

도정수율별 보리의 수화공정(水和工程)에 관(關)한 속도론적(速度論的) 연구(硏究)

The hydration characteristics of barley kernels with various polishing yields were investigated at temperatures of $20-60^{\circ}C$ and their sorption kinetics were studied. The moisture gain in initial stage of hydration was directly proportional to square root of hydration time and there was a break point at the moisture gain of 0.45-0.55g $H_2O/g$ solid. The hydration rate was great in order of polishing yield of 50, 70, 95, 90 and 100%, and increased with increasing hydration temperature. The diffusivity of water into barley kernels followed Arrhenius equation, and the activation energies in hydration reaction of polished barley were ranged from 6.9 to 9.5 Kcal/mole and that of non-polished one was 11.6Kcal/mole.

도정수율별 보리의 수화특성(水和特性)을 $20{\sim}60^{\circ}C$ 범위에서 조사하고 속도론적으로 해석하였다. 흡수량(吸水量)은 수화시간(水和時間)의 평방근에 비례하였으며 흡수양상(吸水樣相)은 흡수량(吸水量) $0.45{\sim}0.55g\;H_2O/g$ solid 이후에서 변화하였다. 수화속도(水和速度)는 도정수율 50>70>95>90%>무도정맥의 순서였으며 수화온도(水和溫度)가 높을수록 증가하였다. 이 때 곡립내부(穀粒內部)로의 물의 확산도(擴散度)는 Arrhenius방정식에 의거하여 변화하였으며 활성화에너지는 도정맥의 경우 $6.9{\sim}9.5Kcal/mole$, 무도정맥의 경우 11.6Kcal/mole이었다.