Soybean plastic film is soaked in water to make it soft, remove the crushed, replay the water, isolate the protein, dry at freezing point to obtain a fine protein powder, and then add other substances in the powder to form a plastic film, available In full bloom and cover food.
The soy protein food packaging film is made by separating soy protein as raw material, treating it with 100 times 0.1N sodium hydroxide for 2 hours, separating by high speed centrifugation, taking the supernatant, and adjusting the isoelectric point of protein with hydrochloric acid to precipitate the protein. Precipitate and freeze-dry the precipitate. The prepared food packaging film is uniform and transparent, has low oxygen permeability, and has good preservation ability, and is suitable for packaging films of medicines, candies, fruits, and meat products.
The soy protein food packaging film is made by separating soy protein as raw material, treating it with 100 times 0.1N sodium hydroxide for 2 hours, separating by high speed centrifugation, taking the supernatant, and adjusting the isoelectric point of protein with hydrochloric acid to precipitate the protein. Precipitate and freeze-dry the precipitate. The prepared food packaging film is uniform and transparent, has low oxygen permeability, and has good preservation ability, and is suitable for packaging films of medicines, candies, fruits, and meat products.
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