New packaging of fresh fruit and vegetable products

The fresh fruit and vegetable products are alive and still breathe after picking and carry out vigorous life activities. On the one hand, respiratory metabolism consumes its own nutrients and moisture, affecting the appearance and quality of fruit and vegetable products. On the other hand, the infection of pathogenic micro-organisms causes decay of fruits and vegetables. Therefore, fresh fruit and vegetable products often show wilting during storage, transportation, and marketing, and the quality deteriorates and decays, thereby losing the value of food.
Good packaging is not only conducive to the preservation of fresh fruits and vegetables, reduce loss, extend shelf life, but also to attract and consumers who play to promote product use. Plastic film is currently the most widely used packaging material for fresh fruit and vegetable products. It is transparent, heat-insulating, breathable, sealable, and inexpensive. It has a broad market application prospect. The following will introduce the preservation of fresh fruit and vegetable products.
1. High-density microporous polyethylene bag: In recent years, it is widely used in foreign countries for fresh fruit. It can add a certain amount and micro-holes to the film bag according to the physiological characteristics of the fruit and the patience of O2 and CO2 concentration. (40μ) to enhance gas exchange, reduce bag humidity and volatile metabolites, relatively high O2 concentration in the bag (<1% O2), prevent excessive O2 concentration resulting in anaerobic respiration resulting in large amounts of ethanol Acetaldehyde and other volatile substances accumulate and affect fruit flavor. The O2 concentration in the film bag can generally maintain a quality of 10-15%, and the endurance of the CO2 concentration is strong, and the fruit and vegetable product with the third humidity, especially the tropical fruit, is very suitable. This kind of bag abroad stores “Bing” sweet cherries, which can be stored in ordinary cold storage for 80 days and can preserve the flavor quality of fruits.
2. High-oxygen atmosphere modified atmosphere packaging: It is a new type of packaging that has emerged in recent years. O2 in high-oxygen spontaneous chlorinated bags is generally maintained at 70-100%. This package has (1) inhibition of enzyme activity, prevention of browning of the fruit and vegetable products introduced thereby; (2) prevention of the introduction of anaerobic respiration and maintenance of the quality of fruit and vegetable products; (3) effective inhibition of aerobic and anaerobic The growth of microorganisms and the prevention of decay have attracted much attention. It is particularly suitable for the preservation of fresh fruit and vegetable products that are prone to anaerobic respiration and fermentation under high CO2 concentration and at low O2 concentrations, as well as fresh-cut fruit and vegetable products. At the same time, according to the characteristics of different fruits and vegetables products, determine the gas combination within the bag. For example: for perishable fruits and vegetables products can be 80-90% O2 + 10-20% CO2; and for CO2 third fruit and vegetable products can be 80-90% O2 + 10-20% N2. The use of high-oxygen-encapsulated mushrooms in the European market can reach a shelf life of 8 days at 8°C.

3. New biodegradable packaging materials that can be degraded: Due to people's concern that long-term use of chemical sterilants will harm human health and pollute the environment, and the increase in the demand for plastic film packaging, the “white pollution” will increase. The function of people for packaging materials has turned to safe and non-toxic green. The new biodegradable biodegradable packaging is a new hot spot in the current international food packaging. It is the use of a number of biodegradable polymer materials, in which the addition of biological bactericidal agents, play a variety of roles such as preservation and degradability and environmental pollution. The packaging material is convenient to use and is particularly suitable for the packaging of fresh-cut fruit and vegetable products and cooked foods, and has a wide application prospect in the packaging of fresh foods in the future. ("Business Express")