A method for storing and keeping chestnut fresh in a mechanical cold storage with humidity adjustment

Abstract

The invention provides a chestnut mechanical refrigerator humidity-adjusting storage and preservation method. The method comprises the steps of: pre-cooling harvested chestnuts in a refrigerator by reducing the temperature in steps, wherein relative humidity in the refrigerator during pre-cooling is over 90 percent; when the chestnuts are pre-cooled in the refrigerator by reducing the temperature in steps to the refrigerator temperature, starting to sub-pack jute bags of lining preservative films, and then adjusting the temperature in the refrigerator to 3 DEG C to minus 1 DEG C for pre-cooling; after pre-cooling, keeping the temperature in the refrigerator at minus 3 DEG C to minus 1 DEG C and the humidity of over 90 percent, storing for 30 to 40 days under the conditions, and adjusting the relative humidity of the refrigerator to 75 to 85 percent, and keeping the humidity in the whole storage period. By the chestnut storage and preservation method, the storage time of the chestnuts can be greatly prolonged, and problems of water loss, mildew and worms in long-time storage of the chestnuts can be solved.

Description

technical field [0001] The invention relates to the field of fresh-keeping, in particular to a method for storing and keeping fresh chestnuts in a mechanical cold storage with humidity adjustment. Background technique [0002] Chestnuts are rich in nutrients. In addition to containing a large amount of starch, they also contain protein and fat. According to measurements, every 100 grams of chestnut contains 4.8g of protein, 1.5g of fat, 15mg of calcium, 11mg of potassium, 9mg of iron, and various vitamins and amino acids. Both raw food and cooked food are deeply loved by people. Traditional Chinese medicine believes that chestnut is sweet and warm, non-toxic, and has the medical effects of strengthening the spleen and liver, strengthening the body and bones, so it is also called "the fruit of the kidney". [0003] Chestnut has a hard shell. People often call it dried fruit or shell fruit. They think it is more resistant to storage and freshness than apples, pears, grapes, et...

AI Technical Summary

Problems solved by technology

[0003] Chestnut has a hard shell. People often call it dried fruit or shell fruit. They think it is more resistant to storage and freshness than apples, pears, grapes, etc. In fact, it is not the case. Chestnut has a strong respiration during storage, and it is easy to lose water and dry. Enzyme activity Strong, starch hydrolyzes quickly, so it is very easy to age, get sick and rot. Chestnut preservation is specifically manifested as "five fears": fear of dryness, fear of humidity, fear of heat, fear of stuffiness, fear of freezing, especially not like walnuts, hickory nuts, hazelnuts and Chinese torreya. Wait for the dried fruit to be dried in the sun before storing or selling. In addition, the chestnut fruit often carries insect eggs, which are very prone to insects. When chestnuts are stored for a certain period of time, the preservation period will be shortened due to germination and mildew, resulting in loss of nutritional value. The loss of economic value makes it impossible to provide high-quality raw materials for the annual production of chestnuts, which restricts the processing and export of chestnuts in my country

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