3. Results and discussion
3.1. Opacity and color parameters of PS/SNCs composite films Table 1 shows the opacity and transparent values L*, a*, b* ofthe PS films with and without SNCs. Contrast to control film, the composite films were less transparent since the opacity increased with increasing SNCs ratio in PS/SNCs composites. This could be ascribed to agglomeration of nanoparticles. Castillo et al. (2013)also reported that film opacity increased significantly with an increase in talc concentration in thermoplastic corn starch formulations, and reduced light transmittance of films. The higher opacity will improve the ability of the films to protect package contents from light and enhance the quality of the packaged food.