Modified atmosphere packaging and fresh keeping method of green-peel walnuts

Abstract

The invention discloses a modified atmosphere packaging and fresh keeping method of green-peel walnuts. Through the steps of performing precooling treatment, compounding gas, performing filling and packaging, performing pumping, performing inflating and performing sealing, the purpose of fresh keeping can be achieved, wherein materials of modified atmosphere packaging bags are any kind of PP materials and PET materials; in modified atmosphere packaging mixed gas, the gas concentration of O2 is 14%-16%, and the gas concentration of CO2 is 2%-3%; the fresh keeping method provided by the invention can reduce the linear rate of the soft rot rate after fresh walnuts are picked for about 43.44%-79.47%, and after the walnuts are stored for 50 days, the soft rot rate is only about 24.14%; the clean and sweet mouth feel of green-peel walnut kernels is maintained; time for enabling moisture content of peel to increase to the critical level of disease occurrence is delayed to about two times thanthat of before; time for generating peak value of endogenous ethylene of the peel of the green-peel walnuts is delayed, and the commodity rate of the green-peel walnuts is maintained; the modified atmosphere packaging and fresh keeping method is obviously better than the prior art; fresh quality of the fruits can be better maintained; the situation that in the storage period of the fruits, the plant disease occurs is reduced; the senescence of the fruits is delayed, and the storage period is effectively prolonged; and the modified atmosphere packaging and fresh keeping method is especially suitable for Xinxin number 2 green-peel walnuts, and the obtained fresh keeping effect is notable and outstanding.

Description

technical field [0001] The invention relates to the field of fruit preservation, in particular to a method for preserving freshness of green walnuts, and specifically refers to the technical field of modified atmosphere packaging preservation of green walnuts. Background technique [0002] Xinjiang is one of the main walnut producing areas in China. The existing walnut area is about 4.5 million mu and the annual output is about 300,000 tons. The scale of the walnut industry ranks second in my country. It has become the pillar industry of Xinjiang's agricultural production and the source of increasing agricultural income. one of the important channels. However, as a general bulk nut commodity, the price elasticity of domestic walnuts has been small for many years, and the average output value per mu is less than 2,000 yuan. Xinjiang jujube with the largest output. With the development of the economy and the expansion of the domestic consumer market, more and more consumers a...

AI Technical Summary

Problems solved by technology

The peel of green-skinned walnuts is the most perishable part of the whole fruit, but green-skinned walnuts are mainly transported by road. Green-skinned walnuts go from picking, transporting, storing, to selling, to being purchased by consumers and stored by families, and finally to being Consumption needs to go through a long period of time; during this period, due to poor transportation conditions, unpackaged, storage is mainly refrigerated, and the lack of reasonable refrigerated technology leads to frequent diseases; when refrigerated at an appropriate temperature, after 10-15 days There will also be browning, blackening and retting, and a large number of Penicillium diseases and soft rot, which greatly reduces the edible taste, economic value and hygienic safety of stored green walnuts. causing huge economic losses to consumers

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