Method for refreshing winter jujube by film coating

Abstract

The invention discloses a method for refreshing winter jujube by film coating, and belongs to the technical field of fruit and vegetable refreshing. The main technical characteristic of the method is that: a chitosan, corn starch and CaCl2 composite refreshing agent is used for coating a film for refreshing. Through treatment of the method, the hardness and the Vc content of the winter jujube can be effectively kept, and rotting, brown stain and reduction in content of soluble solid matters and titratable acid are suppressed, so that the storage period of the winter jujube fresh fruit is effectively prolonged. The method has the advantages that: the refreshing method has the characteristics of simplicity, convenience, safety and practicability; the winter jujube can be stored for 6 months at a low temperature or stored over 1 month at normal temperature to keep the original quality of the fresh fruits. The method is suitable for large-scale commercial application, and has broad application prospect and good economic and social benefit.

Description

Technical field: [0001] A method for coating fresh-keeping winter jujube belongs to the technical field of fresh-keeping fruits and vegetables. Background technique: [0002] Dongzao, also known as Yanlaihong, Apple date, Bingtang date, Lubei Dongzao, Zhanhua Dongzao, Huanghua Dongzao, belongs to the Rhamnaceae family and the genus Jujube. It is a late-maturing and fresh-eaten fine variety of thornless jujube. The vitamin C content in winter jujube is very rich. The content of every 100 grams of fresh winter jujube pulp is 352 mg, which is 70 times the vitamin C content of apples, 140 times that of pears, and 20 times that of Jinsixiaozao. In addition, Dongzao is also rich in vitamin A, vitamin E, potassium, sodium, iron, copper and other trace elements, and has the reputation of "king of fruits" and "live vitamin pills". Eating more winter jujube can soften blood vessels and is an ideal fruit to prevent high blood pressure, coronary heart disease and arteriosclerosis. Especia...

AI Technical Summary

Problems solved by technology

Winter jujube is very susceptible to microbial infection and rot during storage. Simple low-temperature storage can reduce microbial disease, but it cannot fundamentally inhibit it, and browning and V C The loss of other nutrients is obvious

Winter jujube is different from apples, bananas and other fruits, which cannot tolerate high volume fraction of CO in storage for a long time. 2 , so controlled atmosphere storage has no obvious effect

There are many deficiencies in the irradiation fresh-keeping method: its principle is to kill microorganisms, but it cannot inhibit browning and V C In addition, the size of the irradiation dose also involves food safety issues. According to the regulations, the food that has been irradiated must be clearly stated on the label. The realization of irradiation requires extremely strong technical conditions, so it can be operated sex very small

At home and abroad, there have been many researches on the preservation of tomato, cucumber, green pepper, strawberry, kiwi, mango and eggs with chitosan coating film, but there are few studies on jujube preservation, and the literature reports use a single Chitosan-coated fresh-keeping winter jujube, because the chitosan film is sensitive to water and has poor water-proof ability, the single-use effect is not ideal