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Using gas generating agents to preserve fresh fruits and vegetables
Gas generating agents are volatile substances or gases produced by chemical reactions. These gases can sterilize or eliminate gases, such as ethylene, to extend the shelf life. (1) Sulfur dioxide generating agent This method is applicable to storage of grapes, asparagus, broccoli hard flowers such as fruits and vegetables. If 50 grams of sodium bisulfite is mixed with 100 grams of silica gel (or in this ratio), pack it in a small bag made of cotton paper, and arrange the selected Kyoho grape with two layers of fruit stems up in the box. The panels were separated with a heat-insulating panel capable of removing ethylene. After the sulfur dioxide generator was dispersed on the top of the grapes, the box was closed. The box was covered with a 0.04 mm polyethylene film. Stored at a temperature of 0 to 2°C and a relative humidity of 90% can be stored for more than 4 months, and the amount used is generally 0.5% to 1%. (2) Halogen gas generating agent 10 grams of potassium iodide, 10 grams of activated clay, and 80 grams of lactose are thoroughly mixed and packaged with breathable fibrous materials such as paper and cloth. It can also be packaged in a granular package for use in the package. The amount of use varies greatly depending on the type of the stored material and the permeability of the packaging material. Usually, an inorganic halide of 10 to 1,000 mg is used per kilogram of fruit. (3) Ethanol Vapor Generator 30 g of anhydrous silica gel was impregnated in 40 ml of absolute ethanol to make it fully adsorbed. After the absorption is finished, the remaining liquid is removed, put into a moisture-proof and air-permeable container, and put into a polyethylene film bag together with 10 kg of green bananas, sealed and placed in an environment with a temperature of about 20° C., and stored for 3 to 6 days. Can be mature. This ripening method is most suitable for long-distance transportation from the south to the north, and can be sold after reaching the destination.