Determination of optical properties of a corn starch biofilm

In this work, the optical properties of a corn starch-based film were correlated with its structural properties. Scanning electron microscopy was performed to determine if incorporation of starch into the matrix gives a homogenous and smooth surface. X-ray diffraction was performed to identify the relative degree of crystallinity. The optical properties of the film in the range 300 to 2500 nm were studied, showing diffuse total transmissivity and total absorption coefficients comparable with that of low-density polyethylene films. The process used in this research is carried out in an aqueous solvent, without using any toxic raw material, and prepared by casting. The process allows for the use of different additives. This processing of the starch film represents a great advantage also because it takes a maximum of 10 h, four times less than other processes, and no special equipment is needed.