In this study, the chitosan (CS) was combined with purple tomato anthocyanin (ATH) and epsilon-polylysine (PL) to prepare CS/ATH/PL films with PL concentrations of 0%, 1%, 3%, 5%, or 7%. In which, ATH and PL were used as the pH indicator and the antimicrobial agent, respectively. The effect of PL content on the physiochemical properties of CS/ATH/PL films, as well as the application in pork packaging, was investigated. Adding PL improved the color stability of ATH in the films. For instance, at 40 degrees C, the retention index of ATH increased from 82.13% (for CS/ATH/0%-PL) to 91.01% (for CS/...
