Study On The Methods Of Controlling Water Evaporation

This paper first compared the effect of inhibiting water evaporation of the glycerin, crystallization of sorbic, liquid sorbic, maltitol, mannitol, isomalt and xylitol which belong to polyhydric alcohols. Suppress the rate of inhibiting water evaporation and moisture content retention to evaluate the effect of inhibiting water evaporation. Further more use wax as material of Wall Material to prepare W/O emulsion, analysed the effect of inhibiting water evaporation of the W/O emulsion, the influence of different kinds of wax, dosage of emulsified water and the amount of emulsifiers, as well as HLB value on the stability, the rate of inhibiting water evaporation and moisture content retention were discussed. Meanwhile discussing the effect of the alcohol emulsion, by using the modified starch makes sugar polyol emulsion particulates, get particles. Using the Turbiscan Lab enrichment system, analysed how different technological conditions impact on the particle size and distribution, moisture content, and water activity. Through the scanning electron microscopy (SEM) observing particles has irregular structures, colloid properties, particle compact connection.60%Polyhydric alcohols has the best effect of inhibiting water evaporation. Meanwhile,60%xylitol mixed with40%glycerin which total concentration is60%of alcohol solution has the best results, after comparing the effect of inhibiting water evaporation with three alcohol compound, two kinds of alcohol and single alcohol.To study the effect of inhibiting water evaporation of a W/O emulsion system which was prepared with wax. Under the conditions as emulsifying temperature at80℃, emulsifying time of25min and stirring speed of1000r/min, the influence of different kinds of wax, dosage of emulsified water and the amount of emulsifiers, as well as HLB value on the stability, the rate of inhibiting water evaporation and water evaporation loss of the emulsion were discussed. The results showed that when the dosage of emulsified water of emulsion which was prepared with beeswax is40%, HLB value is7and the amount of emulsifier is5%can obtain a uniform fine emulsion with best effective of inhibiting water evaporation and stability. Maked modified starch solution as a continuous phase, polyhydric alcohols as the dispersed phase, mixing under the conditions as1000r/min,the starch solution temperature, stirring time, starch solution concentration and the ratio of two phase weight were discussed.When starch solution temperature at40℃, stirring time is50min, starch solution concentration is30%, the ratio of two phase weight is1:3, get the smallest particle with stablility, low water activity and moisture content close to the theoretical value.