Rheological properties of film solution from cassava starch and kaffir lime oil

Abstract

Rheology of film solution is important to determine the final characteristics of biopolymer film as packaging material. In this study, the dynamic rheological properties of cassava starch-kaffir lime oil film solution were determined. The rheology measurement was made at frequency of 0.1 to 10 Hz and 1 % strain at 25 °C. The storage modulus (G'), loss modulus (G') and complex viscosity (η∗) were determined to know the viscoelastic behavior of the film solution. The magnitude of G' was greater than G' for all samples which indicated that the film solution was a gel-like; that is, the film solution behaves more like a solid where the deformations were elastic and recoverable. All samples show increasing trend of G' and G' as the frequency increased. The complex viscosity decreased with increasing frequency which presented a shear thinning behavior of the film solution. The dynamic rheological properties of cassava starch-kaffir lime oil film solution was determined appropriately, thus the characterization of produced biopolymer film by casting can be correlated.