Preparation and the properties of the composite films from cassava starch and guar gum

The raw guar gum,anionic guar gum with cassava starch were blended to make composite basic edible film in the certain proportion.The films with different contents of starch and guar gum were respectively prepared and characterized.Their properties were measured.The film containing cassave starch and guar gum with the ratio of 80∶20 exhibited the good elongation(E).Compared with the pure starch film,tensile strength(TE)increased by 50%,E decreased by 30%,and the water vapor permeability decreased to 15.8%,water absorption changed a little.The film containing cassave starch and anionic guar gum with the ratio of 80∶20 had the good E.Compared with cassava starch film,the E increased by 142%,but the TE decreased by 22%.The water vapor permeability decreased by 5.4%,while the water absorption decreased by 5.5%.