Abstract
ABSTRACT This work focused on the development and characterization of new emulsified films based on soluble starch/sodium alginate mixture and paraffin oil. Visually, the developed films appeared homogeneous, thin, and slightly flexible. Also, the emulsified films were more opaque compared to the non-emulsified film. The mechanical test showed that the tensile strength and young’s modulus of films increased from 16.42 to 31.9 MPa and from 647.32 to 1411.11 MPa, respectively, upon increasing paraffin oil concentration from 0 to 30% wt, while elongation at break decreased from 18.6 to 13.98%. These results were caused by the formation of amylose–lipid complex confirmed by the apparition of characteristic peaks at 2θ = 13° and at 2θ = 20.15° in XRD analysis. The SEM observations showed the formation of homogeneous microemulsion by the dispersion of paraffin oil droplets with different size in soluble starch/sodium alginate mixture. The presence of these droplets leads to an increase in roughness parameters (Ra and Rq) of films, which is confirmed by AFM. The incorporation of paraffin oil resulted in an improvement in both light and water vapor barrier properties of emulsified films.
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