Optimization of lotus root starch and konjak composite edible films by response surface analysis

The aim of the present study was to optimize the composite of edible films which used the lotus root starch as main material, adding konjak, sorbitol and sodium alginate. The property such as tensile strength, fracture strain, water solubility, oil permeability coefficient and water vapor through coefficient were studied using one-factor design and response surface methodology. The results showed that the composite was 3.6g lotus root starch, 1.22g sorbitol, 0.62g sodium alginate and 0.77g konjak, the tensile strength was highest, and the films properties were feasible. The composite was 3.6g lotus root starch, 1.42g sorbitol, 0.64g sodium alginate and 0.74g konjak, the fracture strain was highest (66.41%) , the film was soft and properties were feasible.