2. Experimental
2.1. Materials
Chemical and materials that were used in this study were available
commercially. Starch (S) was purchased from (Shanghai
RunJie Chemical Reagent Co., Ltd. Purity: 99.9%), gelatin (G) (high
purity 100%), analytical grade KOH (Sinopharm Chemical Reagent
Co., Ltd., Shanghai. Purity P85.0%) and hydrochloric acid (HCl)
were purchased from (Sinopharm Chemical Reagent Co., Ltd.,