| 초록 |
The objective of this study was to obtain experimental data on optimum conditions of aloe vera gel concentration by DIS (Dewatering Impregnation Soaking) or osmotic dehydration process under different osmotic agents and processing factors such as operating pressure and agitation treatment in contactor. Dehydration regime (water loss/solid gain: WL/SG) and water loss (WL) were determined as main objective variables of DIS process. As the result, polyethylene glycol (PEG) solution as a single osmotic agent was more excellent dewatering property than binary solution of sugars (glucose, sucrose and high fructose syrup) and sodium chloride. However, ternary solution (sugar plus sodium chloride) showed higher WIJSG ratio and WL(%) than those of binary solutions, and these results were similar to that of PEG solution. Also, processing factors such as operating pressure and agitation treatment showed only a very little effect, and thus either no operating pressure and agitation or slow agitation was found to be considered in such of processing design. From the DIS processing of fileted aloe using ternary solution (50% glucose plus 0.5% NaCl) without operating pressure and agitation treatment, the WL/SG ratio and WL(%) of 19.37 and 66.24 were obtained, and these values were about 2 and 1.3 folds higher than that of binary solution (50% glucose), respectively. Also, the highest polysaccharide content of 3,543±152 mg/L was about 1.2 and 4.3 folds higher than that of each binary solution (50% glucose) and fresh aloe gel. respectively. |
