As we all know, mushrooms are not only delicious but also have high nutritional value. However, the shelf life of fresh mushrooms is short. Generally, fresh mushrooms can be stored for 2-3 days, and they can be stored in a cold room for 8-9 days.
If we want to keep fresh mushrooms fresh for longer time, we must first analyze the spoilage process of fresh mushrooms. Mushrooms after picking produce a lot of breathing heat, and the mushrooms are heavy in water. The bacteria on the surface become more active under the influence of heat in a humid environment. The high amount of breathing heat accelerates the aging process of mushrooms, which begins to accelerate the opening and discoloration of mushrooms, seriously affecting the quality of mushrooms.
Mushrooms need to quickly remove their "breathing heat" after being picked. Vacuum precooling technology is based on the phenomenon that "as the pressure decreases, water begins to boil and evaporate at low temperatures" to achieve rapid cooling. After the pressure in the vacuum precooling machine is reduced to a certain level, the water begins to boil at 2°C. During the boiling process, the latent heat of the fruits and vegetables is taken away, causing the surface to the inner layer of the fruits and vegetables to completely drop to 1°C or 2°C within 20-30 minutes. . Vacuum pre-cooling greatly extends the shelf life of products.
Compared with traditional cooling technology, vacuum pre-cooling is more efficient and energy-saving. The advantage of vacuum pre-cooling is that it is fast, and the fluffy structure of the mushroom itself makes it easier to achieve consistent pressure inside and outside; the principle of the equipment is that if the vacuum degree is consistent, the temperature will be consistent; and the mushroom will enter a dormant state and stop the generation of breathing heat. Growth and aging. After the vacuum pre-cooling reaches the point where the mushrooms stop breathing heat and enter the preservation temperature, gas is added for sterilization. This is all done in a vacuum pre-cooling machine, which means that the mushrooms we pick can cool down, remove breathing heat, and sterilize within 30 minutes. Moreover, the water evaporation function is turned on while vacuum pre-cooling, which promotes the evaporation of water on the surface of the mushroom and seals the internal water from evaporating.
At this time, the mushrooms are in a sleeping state, with no water on the surface and sterile, and the temperature has dropped to about 3 degrees Celsius, the preservation temperature. Then store it in a fresh-keeping warehouse in time to achieve the purpose of long-term storage. After mushrooms are picked, the cell life is threatened and will produce some harmful gases for self-protection, and the harmful gases are extracted through the vacuum system.
There are several key points in the process of keeping mushrooms fresh using a vacuum pre-cooling machine that deserve our attention:
1. Rapidly achieve core cooling within 30 minutes after picking.
2. Stop breathing heat and stop growing and aging.
3. Return gas for sterilization after vacuuming.
4. Turn on the evaporation function to evaporate all the water on the mushroom body, preventing bacteria from surviving.
5. Vacuum pre-cooling will naturally shrink wounds and pores, achieving the function of locking in water. Keep the mushrooms fresh and tender.
6. Transfer to a cold room and store under 6 degrees Celsius.
Post time: Feb-21-2024