Optimization of Yellow Dextrin for the production of Starch based Adhesive.

Abstract

This study investigates the optimization of yellow dextrin for the production of starch based adhesive using cassava starch. It involves the optimization of process variable namely, roasting temperature, roasting time and concentration of acid using Minitab 17 software in order to achieve the optimum combination of the variables that will give the best solubility for yellow dextrin. In the dextrinization process, a temperature range of 80 to 1000C was adopted, while acid concentration rage of 0.25 to 0.3M and time rage of 60 to 120 minutes were used. The results obtained shows that roasting temperature of 1000C and roasting time of 120 minutes with concentration of 0.25 M gave a yellow dextrin with the highest solubility of 42.8 %. The individual and combined ( interaction ) effects of the process parameter were determined using factorial analysis. An empirical model was also developed for the factorial analysis. The analysis showed that the process variables (roasting temperature, roasting time and concentration of acid) have significant effect on the solubility of the yellow dextrin produced. It also suggest the best of yellow dextrin was produced by at a roasting temperature of 1000C , concentration of 0.3 M and roasting time of 120 minutes and the model equation for the predicted value o f yellow dextrin solubility as 42.55 %. Yellow dextrin of the highest solubility was consequently used to prepare adhesive. The viscosity, drying time and the pH of the adhesive produced are 1.5 Pas, 4.13 minutes and 7.54 respectively.