Development of novel active polypropylene based packaging films containing different concentrations of sorbic acid

Abstract

Active polypropylene (PP) based packaging films containing sorbic acid (SA) at concentrations of 2, 4 and 6% w/w were prepared using extrusion molding method. Mechanical, physical, spectroscopy and microbial properties of the films were evaluated. The results showed a significant (P 0.05) different from those of control film. Increasing SA concentration to more than 2%, led to an increase in b* and yellowness index, while decreased whiteness index. PP-SA films showed antibacterial properties against E. coli and S. aureus as well as antifungal effects on A. niger. Antifungal effects of active films were more noticeable than their antibacterial effects.