| Using potato starch as the primary ingredient, and the water versus oil absorption as the indicator, this research study focuses on different methods of citrate starch, starch stearate and double-esterified Citrate starch-Starch stearate preparation by SEM, FTIR, DSC and Brabender viscosity. The results are shown below:1.Based on single factor experiments, the reaction temperature had significant effect on water absorption of citrate starch; interaction results showed that reaction time and p H,reaction temperature and p H had significant effect on water absorption of citrate starch(p<0.01); reaction time and reaction temperature had significant effect on water absorption of citrate starch(p<0.05); citric acid added and other factors had no significant effect on water absorption of citrate starch(p>0.05). The results indicated that the optimal processing condition is a combination of a reaction time of 6.5hours, a reaction temperature of 127℃, p H value of 3.6, 17% of citric acid added(with potato starch on a dry basis). Under this condition, the actually obtained the water absorption rate of starch citrate was 574.5%, and the relative error to the predictive value of 576.184% is 0.29 %. The results also showed that water absorption of citrate starch treated by microwave-pretreated starch(560.67%)had no significant differents with ctrate starch.2. microwave-assisted technique had significant on citrate starch, interaction results showed that reaction time and p H had significant effect on water absorption of citrate starch(p<0.01); mic-time and p H,mic-time and reaction time,mic-time and reaction temperature had significant effect on water absorption of citrate starch(p<0.05); but reaction temperature and time, p H and reaction temperature had no significant effect on water absorption of citrate starch(p>0.05). The results indicated a processing condition of p H at 3.48, reaction temperature at 126 ℃, reaction time of 6.0hours, mic-time 7 min, citric acid addition of 15%, and a microwave power of 640 W is ideal. Under this condition, the actually obtained the water absorption rate of starch citrate was 760.83%, which has arelative error of 0.518% to the predictive value of 764.771%.3.Based on oil absorption, interaction results showed that the addition amount of stearic acid and amount of water had significant effect on oil absorption of stearic acid starch ester(p<0.01); the addition amount of stearic acid and mic-time, the addition amount of stearic acid and mic-power had significant effect on oil absorption of stearic acid starch ester(p<0.05); but mic-time and amount of water, amount of water and hydrochloric acid added, hydrochloric acid added and mic-time had no significant effect on oil absorption of stearic acid starch ester(p>0.05). The results show that: the addition amount of 3.4% stearic acid, microwave time 5.5min, 31% of the amount of water, hydrochloric acid added in an amount of 0.1%, stearic acid starch ester obtained oil absorption rate of 80.33%, and 80.60% of the predicted value relative error of 0.335 %.4.Based on single factor experiments, amount of water added had significant on citrate starch-starch stearate. interaction results showed that the amount of water added and mic-time, amount of water added and hydrochloric acid added,mic-time and the addition amount of stearic acid had significant effect on oil absorption of citrate starch-starch stearate(p<0.01); but mic-time and hydrochloric acid added, amount of water and hydrochloric acid added, hydrochloric acid added and the addition amount of stearic acid had no significant effect on oil absorption of citrate starch-starch stearate(p>0.05). The result showed that the lipid absorption rate of produced citrate starch-starch stearate was 97.33% when the amount of water added was 26.5%, tmicrowave was 4.4 minutes, the amount of stearic acid added was 1.94%(adjusted to 2.00% in this study), amount of HCladded was 0.10%. The absolute error was 0.237% between actual result(97.33%) and expected result(97.10%).5.Physicochemical characteristics indicate: double-esterified Citrate starch-Starch stearate had the best combination of lipid and water absorption rates while microwave-assisted citrate starch had the highest water absorption rate. SEM、IR 、DSC 、DS are show different influence on esterification. |
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