The sliced purple sweet potatoes will be osmotically partial dehydrated using the different concentrations of sucrose (40, 50 & 60 %), salt (0, 2 & 4 %), time (2, 4 & 6 hrs.) and fixed temperature (40ºC) and random stirring of osmotic solution for 2 min with the spatula at every 10 min. The slices will have placed in 1000 mL beakers containing the osmotic solutions and maintained in a bath with the temperature control. The mass ratio of the osmotic medium to the sample will be 10:1, to avoid the significant dilution of the medium and subsequent decrease of the driving force during the process. The samples will be removed from the solution after the treatments, drained and the excessive solution will be wiped out using absorbent paper. Then, the samples will be used to study for selection of optimum conditions prior to storage study.
The optimum conditions for producing osmotically partial dehydrated purple sweet potatoes will be selected based on water loss, solute gain and rehydration ratio as shown below.
The sliced purple sweet potatoes will be osmotically partial dehydrated using the different concentrations of sucrose (40, 50 & 60 %), salt (0, 2 & 4 %), time (2, 4 & 6 hrs.) and fixed temperature (40ºC) and random stirring of osmotic solution for 2 min with the spatula at every 10 min. The slices will have placed in 1000 mL beakers containing the osmotic solutions and maintained in a bath with the temperature control. The mass ratio of the osmotic medium to the sample will be 10:1, to avoid the significant dilution of the medium and subsequent decrease of the driving force during the process. The samples will be removed from the solution after the treatments, drained and the excessive solution will be wiped out using absorbent paper. Then, the samples will be used to study for selection of optimum conditions prior to storage study. The optimum conditions for producing osmotically partial dehydrated purple sweet potatoes will be selected based on water loss, solute gain and rehydration ratio as shown below.
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