Effect of Packaging with Porous-Mineral Mixed Plastic Films on Keeping Quality of Several Vegetable

Abstract

Several plastic films mixed with porous minerals were developed as packaging use for vegetables and fruits, aiming at elimination of accumulated ethylene in the package. Using several types of these films the effect on keeping quality of some vegetables were investigated comparing with ordinary polyethylene film. In both cases when vegetables were packaged or ethylene only was enclosed, no special ability to eliminate the ethylene was found with the mineral-mixed film bags, while ethylene leaked out gradually in almost the same manner as ordinary polyethylene bag. The gas permeability, however, differed among films suggesting some differences in quality-keeping characteristics.
With shredded cabbage, half-cut cabbage and half-cut lettuce, substantial difference was not found among various films in the effect on keeping freshness. With broccoli, however, the difference of packaging effect was obvious among films. In the films with low gas permeability, green appearance and ascorbic acid content were well kept during storage, but an unfavorable off-flavor occurred with cut-broccoli.