Extension of Cheese Shelf-Life Using Chitosan-Procyanidin Composite Film with High Antioxidant Activity

摘要

The chitosan-procyanidin composite film (CS-PC film) with high antioxidant activity was prepared for cheese packaging. The DPPH scavenging rate of the CS-PC film was up to 84.34%, with 2.5 times higher than that of the CS-control film. The CS-PC film had great capacity to block UV-vis light with obvious absorption at 280 nm. In the migration testing, 3.39% of PC in film migrated to the water simulant. The properties of cheese packaged by CS-PC film at 5 °C for 30 days, including gas composition, sensory evaluation, color, pH value, total number of colonies and peroxide value, were measured. As to cheese packaged by CS-PC film, the peroxide value (1.21 meq/kg) and total number of bacterial colonies (1.04 cfu/g) were significantly lower than that of other materials. The cheese packaged with CS-PC film received the best sensory evaluation. The shelf life of cheese packaged with CS-PC film was extended to 156 days, which is 111 days longer than that of PET film. In conclusion, CS-PC film is an excellent packaging material for packaging cheese.