Effect of Packaging Film Permeability on the Quality of Postharvest Broccoli during Cold Storage
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Abstract:
The effects of packaging films with different oxygen and carbon dioxide transmission rates on the package headspace gas composition during modified atmosphere packaging (MAP) for the preservation of postharvest broccoli, and the changes in the storage quality of broccoli were studied. After precooling, fresh broccoli was packaged and sealed in 30 cm×25 cm polyethylene bags with four different oxygen and carbon dioxide transmission rates and stored at 1±0.5 ℃ for 60 d. Changes in package headspace gas composition, tissue electrolyte leakage, color difference, sensory attributes, vitamin C (Vc) content, and chlorophyll content were investigated. The results indicated that packaging films with different oxygen and carbon dioxide transmission rates significantly (p<0.05) affected package headspace gas composition, L* value, product storage quality, and shelf life under the conditions of this experiment. Among them, stable oxygen (11.86~15.78 kPa/500 g) and carbon dioxide (2.61~4.25 kPa/500 g) levels could be maintained in the packages with oxygen and carbon dioxide transmission rates of 16398.3 cm3/m2·24 h·0.1 MPa and 68644.9 cm3/m2·24 h·0.1 MPa from day 1, and the freshness and high overall quality scores of the products stored in these packages were maintained until the end of the storage period.
