Effect of Applying a Novel Modified Film for Modified Atmosphere Packaging on Strawberry Storage
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Abstract:
For better storage and transportation of strawberries, polyethylene (PE) was modified with poly(butylene adipate-co-terephthalate) (PBAT) and poly(butylene succinate) (PBS) to produce a novel PE/PBAT/PBS blend film with improved gas permeability and antifogging ability suitable for modified atmosphere packaging of strawberries. The PE/PBAT/PBS blend film was prepared by a twin-screw extrusion line and compared with a commercial PE film by analyzing the physical and chemical indexes of strawberries preserved in bags made of both films. The effect of applying the PE/PBAT/PBS blend film for spontaneous modified atmosphere packaging on strawberry preservation was evaluated by measuring the gas concentrations, sensory scores, weight loss rate, soluble solids content, and total phenolic and flavonoid contents of strawberries. At the third day of storage, the CO2 and O2 concentrations in the PE/PBAT/PBS packaging bags were consistent between 5%~7% and 3%~5%, respectively. Under these conditions, the favorable sensory quality of strawberries was maintained for 23 days, with a weight loss below a mass fraction of 5%; on day 23 of storage, the vitamin C content, firmness, and total soluble sugar of the strawberries only decreased to 44.72 mg/100 g, 2.83 kg/cm2, and 8.47%, respectively, with a color difference of approximately ten and consistently high flavonoid and total phenolic contents. These findings demonstrate that the PE/PBAT/PBS blend film suppresses the respiration of strawberries, providing theoretical support for its ability to extend strawberry shelf life.
