Study on preparation technology of composite edible film of corn starch and wheat starch

Edilble composite films were prepared from corn starch and wheat starch by casting films- solution on leved trays. The effects of the radio of corn starch and wheat starch,sorbitol content,citric acid content,strengthening agent content,gelatinization temperature,gelatinization time on the mechanical properties were investigated.The four factors three levels orthogonal test was used to optimize the conditions of mechanical properties.The results showed that the optimum condition were solution concentration 60 g / L,corn starch and wheat starch mass ratio 40∶ 60,sorbitol content 0.6%,citric acid content 2.5%,strengthening agent content 1.4%,gelatinization temperature 85 ℃,gelatinization time 40 min.Under these conditions,for the films,the tension strength was 14~15 MPa,the percentage elongation at break was 30% ~33% 。