Litchi low-temperature plasma sterile controlled atmosphere preservation method

Abstract

The invention discloses a litchi low-temperature plasma sterile controlled atmosphere preservation method. The method comprises the following steps: S1, picking fresh litchis in the morning, removingfruits with plant diseases and insect pests, damaged fruits, small fruits and dried fruits, putting the fruits into a controlled atmosphere fresh-keeping bag, and performing pre-cooling on the fresh litchis in a refrigeration house; S2, after pre-cooling, taking out the litchis together with the controlled atmosphere fresh-keeping, performing sealing on the controlled atmosphere fresh-keeping bag,and sending the sealed controlled atmosphere fresh-keeping bag into a plasma treatment closed chamber for low-temperature plasma treatment; and S3, transferring the litchis subjected to low-temperature plasma treatment and the controlled atmosphere fresh-keeping bags into a refrigeration house for storage, and regularly transferring the litchis into a plasma treatment closed chamber for low-temperature plasma treatment. The litchi preservation method breaks through the current situation of mainly depending on chemical treatment for a long time and other situations of poor physical treatment effect in litchi preservation, the low-temperature preservation period of litchis is greatly prolonged on the basis of the physical preservation technology of combining low-temperature plasma with sterile controlled atmosphere packaging, and effective preservation of litchis is achieved.

Description

technical field [0001] The invention belongs to the technical field of fresh-keeping of fruits and vegetables, and in particular relates to a method for low-temperature storage and fresh-keeping of litchi. Background technique [0002] Litchi is a kind of fruit that is difficult to store. After picking, the fruit has the characteristics of "changing color in one day, changing fragrance in two days, changing taste in three days, and disappearing in four or five days". Under normal conditions, it will deteriorate and lose its commodity value in about 3 days, and its storage period under low temperature conditions is only about 30 days. In terms of production, the low-temperature fresh-keeping storage of litchi mainly uses chemical drugs for sterilization, anti-corrosion, and anti-browning. Sulfur treatment is more commonly used. However, the sulfur treatment will lose the natural fruit color, the fruit will be soft, and there will be residual odor, which is a problem of envi...

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Problems solved by technology

However, the use of a vacuum container also requires a vacuum pump (research on decompression preservation technology of subpackaged low-temperature plasma, preservation and processing, 2002.2), which requires a large investment and complicated operations. If a decompression store is built, the investment will be even greater, and the operation will be more difficult and complicated.

Install the receiving low-temperature plasma device on each plastic bag and connect it with the plasma generator (the method for detoxifying and fresh-keeping fruit and vegetable food with low-temperature plasma, invention patent application number 001109863), and fruit and vegetables are installed in the airtight container, and the same is done every day. Inject low-temperature plasma into the container at all times... (Method and device for fresh-keeping fruits and vegetables by low-temperature plasma, invention patent application number 001005006), these methods are very complicated in practice and have little application value

[0005] In addition, plastic is an insulator, which will generate a large amount of static electricity during application, which will interfere with processing and affect use.

Antistatic agents are used in production to eliminate the influence of static electricity, but even if it is made into a conductive film for lychee freshness preservation, the test proves that it cannot penetrate the plasma components and is ineffective for freshness preservation

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