What are the storage methods for fruits and vegetables?

What are the storage methods for fruits and vegetables?

There are many kinds of air-conditioning methods in the air-conditioning warehouse, which are different depending on the equipment conditions and gas concentration index requirements. In general, they can be divided into the following types: natural oxygen reduction, nitrogen and oxygen reduction, and suitable concentration gas replacement. Decompression atmosphere and atmosphere packaging.

1. Natural oxygen reduction method

Natural oxygen reduction relies on the respiration of fruits and vegetables, which causes the environment O2 to fall and CO2 to rise. It is also called the modified Atmosphere Storage (MA). It is currently widely used in large-scale commercial atmosphere storage of agricultural products. Specifically, there are bagging method, big account method, silicone rubber window method and so on. The advantage of this method is that the process is simple, the cost of oxygen reduction equipment is low, and it is suitable for general promotion in economically underdeveloped areas. However, the storage of MA cannot precisely control the gas composition, the oxygen reduction rate is slow, and the preservation effect is limited. At the same time, this method has high management requirements and is prone to respiratory disorders caused by low O2 or high CO2, which threatens the storage safety of agricultural products. What are the storage methods for fruits and vegetables?

Nitrogen and oxygen reduction are used to replace the gas in the reservoir by nitrogen charging to achieve oxygen reduction. This method allows for rapid oxygen reduction, which is typically achieved at 24 hours or a little longer. After the lychee was sealed with a low-density vinyl plastic film of 0.0329 mm, it was evacuated, then filled with N2, and stored in an environment of 5 °C. The result was that after lychee was stored for 40 days, the good fruit rate was 70% and the sugar content decreased by only 4.2%. As a control, the sample placed in the 5 ° C freezer had not lost any commercial value within 13 days. After testing, at the beginning of storage, the O2 concentration in the account is between 13% and 15%, the O2 concentration during storage is between 8% and 10%, and the CO2 concentration is maintained at around 3%.

3, suitable concentration index gas replacement method fruit and vegetable gas storage library storage methods

Appropriate concentration index gas replacement refers to an atmosphere regulation in which an O2, CO2 and other gases are artificially arranged into a mixed gas according to an appropriate concentration index, and the original gas in the storage environment is simultaneously input to the storage environment to maintain the proper concentration index. The method, also known as the artificial control gas modulation method (Controll Atmosphere Storage referred to as CA storage) or modified atmosphere storage method (CA library method). This method, which is developed on the basis of refrigeration and has precise control of the composition of the ambient gas, has a significantly better storage effect on the storage of fruits and vegetables than other methods, but this method requires high equipment and is expensive, and requires complicated atmosphere refrigeration. Library.