A pH-intelligent response fish packaging film: Konjac glucomannan/carboxymethyl cellulose/blackcurrant anthocyanin antibacterial composite film

Blackcurrant anthocyanins (BCA) can be used to improve the structure and properties of konjac glucomannan (KGM)/carboxymethyl cellulose (CMC) composite film. In this study, the microstructure of the KGM/CMC/BCA composite film was evaluated. The results show that BCA is uniformly dispersed in the KC matrix, which changes the mechanical properties of the film (tensile strength (TS): 55.00 → 38.44 MPa and elongation at break (EB): 8.60 → 3.67%) and barrier properties (water vapor permeability (WVP): 0.67 → 2.53 g·mm/m2 day kPa). With the addition of BCA (0.05, 0.15, 0.20 wt%), the composite film exhibits higher thermal stability. Among them, 0.15 wt% has the best thermal stability. The composite film also shows the antioxidant and antibacterial properties of BCA, and has an inhibitory effect on food-borne pathogens. The composite film will show different colors in different buffers, which can be observed with the naked eye. Therefore, KGM/CMC/BCA film can be applied to smart food packaging to realize real-time monitoring of meat product quality.