Fruit and vegetable fresh-keeping technology

Due to the increasing development of world trade, fruits, vegetables, and flowers that grow thousands of miles away have become your delicacies on the table and the interior decoration is no longer a dream. However, fruits, vegetables, and flowers are things that are not easy to preserve after all. No matter how advanced traffic is, they cannot ensure that fresh fruits and vegetables do not deteriorate in transit, nor can they guarantee that flowers do not wilt during the journey. In order to allow fruits and vegetables and flowers to appear in the freshest state in the market thousands of miles away, researchers in various countries have increased the research and development of fruit and vegetable flowers and achieved a lot of achievements.

In order to keep fruits and vegetables fresh in air transportation, a U.S. company has invented a new method to reduce oxygen and increase nitrogen content in the packaging box. This new type of air-conditioned packaging box for air transport has a special film. The film fiber can absorb oxygen molecules and allow nitrogen to pass through. In this way, after the air enters the box through the film, the nitrogen content in the box can be as high as 98% or more. High nitrogen content can slow down the breathing of fruits and vegetables, and thus achieve The purpose of keeping freshness for a long time. A food company in the United States made an edible package using cheese and acetyl monoglycesterol extracted from vegetable oils. This is a transparent, odorless cover film, which is affixed to the surface of cut fruits and vegetables to prevent dehydration, blackening, and the intrusion of microorganisms, so that the cut fruits and leeks can also be long-lasting. Keep it fresh.

In response to the problem of easy wilting of fresh cut flowers, Israel has recently developed a new method of fresh-keeping and packaging of fresh flowers. The method is to improve the bubble-filled plastic, which is usually used for packaging computers and electronic instruments, to make a new packaging filling, which is filled in the box of enamel flowers, not only inside the box. The temperature is lowered by a few degrees, and the exchange of air inside and outside the box is also slowed down, which plays a good role in freshness preservation.

At present, foreign research on the preservation of fresh fruits and vegetables and food packaging mainly focuses on materials selection and technology.

Japan introduced a one-time use of fruit and vegetable cling film, which is composed of two highly transmissive nylon semi-packing machine 'target=_blank> transparent film, a layer of sand syrup between the two layers, in order to make the packaging film Slowly absorb moisture that has exuded from the surface of fruits and vegetables, so as to achieve the purpose of preservation. A Japanese food company also produced a fruit fresh-keeping box, which is lined with corrugated paper in corrugated boxes with a layer of polyethylene film, and then coated with a waterproof wax coating containing trace amounts of fruit disinfectants to prevent fruit. Moisture evaporates and inhibits its breathing. This box can keep fruit fresh for up to one month.