Method for preserving <i>Ziziphus jujuba</i>

摘要

A method for preserving Ziziphus jujuba, including: 1) preservation treatment of the Ziziphus jujuba harvested by a) fumigation and b) soaking the Ziziphus jujuba in a liquid preservative at room temperature; 2) air-drying the soaked Ziziphus jujuba and placing it into polyethylene bags, and then placing the Ziziphus jujuba into an inner atmosphere of a jacketed cold and controlled atmosphere storage warehouse and cooling it at 4° C. for 24-48 hours; and after slowly reducing the temperature of the inner atmosphere to −3.0±0.1° C. over a period of 6 days, closing off the inner atmosphere and controlling its composition. During the cooling step, air is circulated between the inner atmosphere and the outer atmosphere of the jacketed cold and controlled atmosphere storage warehouse.

主权项

1. A method for preserving Ziziphus jujuba, the method comprising:
a) harvesting Ziziphus jujuba; b) fumigating the Ziziphus jujuba with 1-methylcyclopropene in a closed environment for 8-24 hours, and then soaking the Ziziphus jujuba in a liquid preservative at room temperature, the liquid preservative comprising:
an antibacterial agent at 0.1-0.5 wt %;an antifungal agent at 0.01-0.05 wt %;an anti-aging agent at 0.5-5.0 wt %;a growth regulator at 50-150 ppm;a bio coating agent at 0.5-1.5 wt %;an emulsifier at 0.2-1.0 wt %; andthe balance being water; c) air-drying the Ziziphus jujuba, and then placing the Ziziphus jujuba into polyethylene (PE) bags; d) transferring the PE bags into an inner atmosphere of a jacketed cold and controlled atmosphere storage warehouse, the jacketed cold and controlled atmosphere storage warehouse further comprising an outer atmosphere; e) maintaining a temperature of the inner atmosphere at 4° C. for 24-48 hours while maintaining a temperature of the outer atmosphere at 4.0±0.5° C.; f) reducing the temperature of the inner atmosphere by 2° C. per day until reaching −3.0±0.1° C. over a period of 4-6 days while first controlling the temperature of the outer atmosphere to 0±0.5° C. for 2-3 days and then to −4±0.5° C. for 2-3 days, and circulating air between the inner atmosphere and the outer atmosphere, wherein an amount of the air circulated between the inner atmosphere and the outer atmosphere per hour is 15-20 times the volume of the inner atmosphere; and g) sealing the inner atmosphere and controlling it to have a concentration of oxygen of 2-3 v/v %, a concentration of carbon dioxide lower than 1 v/v %, a concentration of exogenous ethylene lower than 1 mg per kilogram of the Ziziphus jujuba, a concentration of exogenous ethanol lower than 1 mg per kilogram of the Ziziphus jujuba, and a relative humidity of 95-98%, while controlling the temperature of the outer atmosphere to −4±0.5° C. for 20 days until a temperature of the Ziziphus jujuba reaches −3° C. and then maintaining the temperature of the outer atmosphere at −3.5±0.5° C.