After harvesting, fruits and vegetables should be provided to the market with fresh, high-quality products. In order to obtain high-quality products, some astringent fruits and vegetables should be treated with astringent treatment to improve their quality. The mechanism of destringency is to bind acetaldehyde, acetone, etc., which is an intermediate product of hypoxia respiration, with tannins, so that it is solidified into an insoluble resinous substance, which makes a person feel no astringency. According to the above principles, it is possible to artificially cause anoxic conditions to transform the tannins and thus to act as astringent. There are many ways to remove astringent, which can be divided into the following categories:
1, anoxic off astringent. Such as carbon dioxide and deoxidizers. The carbon dioxide method is to place the fruit in a high concentration of carbon dioxide and forced anaerobic respiration to achieve astringentness, which generally takes 4-7 days. Deoxidizer method is the use of oxygen absorber to cause anaerobic respiration, to achieve the purpose of dehydration, the main deoxidizers are: dithionine, sulfite and so on. The general deoxidizer is placed in an air permeable material and placed in an airtight container together with the astringent fruit to achieve astringent effect.
2, chemical exposure off astringent. The use of ethephon, alcohol and other substances on the ripening of the fruit, make it off astringent, ethephon concentration of 250-500ppm plus 0.2% detergent as a spread agent, spray fruit or fruit. Alcohol can also be used to promote fruit ripening to achieve astringency.
3, the physical method of astringent. Physical desorption methods include drying, freezing and warm water. After astringent persimmons are peeled and dried, they can be naturally astringent. Frozen astringent fruit can make soluble tannins insoluble tannins to make them astringent. The astringent warm water is ripened in warm water, and it also causes anaerobic conditions to carry out the astringency.
There are many methods for removing astringent other fruits and vegetables, such as traditional lime and astringent.
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