Selection of packaging materials are as important as tastes of food for high presssure food processing. Plastic films are generally acceptable for high pressure processing, while they are not usually suitable for high temperature processing. On the other hand, metal cans and glass wares are not suitable for the pressure treatment. Ochiai and Nakagawa pointed the importance of the head-space in plastic cups and suggested the use of plastic paper as a package material because of its heat-sealability and hygienic safety (7). Packaging materials which prevent oxygen permeability and light exposure should be developed especially for keeping fresh color and flavor of foods.

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