Abstract
The physical properties of reconstituted instant rice produced by three different dehydration methods were evaluated. The rehydration ratios of reconstituted instant rice produced by air dehydration at 9$0^{\circ}C$ (process A) had higher values than those produced by freeze dehydration (process C) during entire range of rehydration. After 4min of rehydration time at 95$^{\circ}C$ , the moisture contents of reconstituted instant rice produced by process A and C were higher values than those of control(151.47%, dry basis) which was cooked by electric cooker. Regardless of dehydration method, the sizes of reconstituted instant rice (6min, 95$^{\circ}C$) had larger values than those of control. The values of hardness (H), stickiness (S) and S/H ratio of reconstituted instant rice (6min, 95$^{\circ}C$) produced by high temperature (7min, 15$0^{\circ}C$) air dehydration (process B) as the first stage prior to air dehydration at 9$0^{\circ}C$ were almost the same as those of control. The H of reconstituted instant rice decreased, while S and S/H ratio increased with increasing rehydration time. The higher values of whiteness(L) and lower values of yellowness (b) represented in reconstituted instant rice (6min, 95$^{\circ}C$) than those of control.
세 가지 다른 건조공정을 이용하여 만든 건조즉석쌀밥을 복원시킨 후 대조구와 물리적 성질을 비교한 결과 복원율은 9$0^{\circ}C$의 열풍온도에서 건조시킨 process A가 동결건조(process C)에 비하여 전반적으로 높은 복원율을 나타내었으며, process A와 Process C 모두 4분이내에 대조구 (151.47%, dry basis)와 같은 수준의 수분함량으로 복원되었다. 95$^{\circ}C$에서 6분간 복원시킨 즉석 밥의 크기는 건조방법에 관계없이 대조구보다 컸으며, 조직감에서는 고온열풍건조(15$0^{\circ}C$)를 거친 process B방법으로 건조시킨 후 6분간 복원한 즉석밥이 대조구의 경도, 끈기, 끈기 대 경도의 비 값과 유사하게 나타났다. 건조방법에 관계없이 복원시간이 길어짐에 따라서 경도는 줄어들었고 끈기와 끈기 대 경도의 비는 커졌다 표면색깔에서는 6분간 복원시킨 즉석 밥은 대조구에 비하여 높은 L값과 낮은 b값을 나타내었으며, 열풍건조방법과 동결건조방법이 거의 비슷한 L값과 b값을 나타내었다.
