The effect of ambient temperature of the strech film fresh-keeping bag on fruits and vegetables

During the storage process of the strech film bag, the content of titratable acid and Vc in hawthorn showed a downward trend, and the content of reducing sugar first increased and then decreased, because most of the nutrients were continuously consumed during the postharvest storage of fruits and vegetables. Titratable acid is the direct substrate of the respiration of fruits and vegetables. If the respiration is strong, its content will decrease rapidly. Appropriate low temperature can reduce the activity of enzymes in respiratory metabolism, and then reduce the respiration rate, thereby reducing the amount of hawthorn during the storage of the strech film. Titrate acid consumption.

        Hawthorn contains a lot of pectin, and the unripe fruit is mainly protopectin. During the ripening and aging process, protopectin will be converted into pectin and further converted into pectic acid, and then into reducing sugar in stretch film bag , When the generation rate of reducing sugar is greater than the consumption rate, the reducing sugar content in hawthorn gradually increases. With the continuous consumption of pectin, the generation of reducing sugar in the strech film bag cannot fill the consumption, so there will be a pre-storage period of hawthorn. The reducing sugar content rises and falls later.