A kind of variable temperature frozen storage method of Ruan'er pear

Abstract

The present invention relates to a method for frozen storage of Ruan'er pears at variable temperatures. The method comprises the following steps: (1) cleaning and disinfecting the cold storage before freezing, and sterilizing with an ultraviolet lamp for 1 hour; Varieties and grades are sorted into the cold storage in turn and stacked neatly; (3) First control the temperature of the cold storage at ‑8°C for 7 days, then cool down to ‑15°C for 10 days, continue to cool down to ‑25°C for 10 days, and then return to temperature Frost on the fruit surface at ‑5°C; when frost spots appear on 30% of the fruit surface, cool down again to ‑15°C and freeze for 10 days, then continue to warm up to ‑5°C and freeze for 10 days; when 30% of the fruit surface appears frost spots again Control the temperature to ‑15°C and freeze for 10 days; at this time, the fruit meets the sales requirements; (4) wrap the fruit basket with plastic wrap, and control the temperature of the cold storage at ‑18~‑25°C for regular frozen storage for annual sales. The present invention makes all the pears brown evenly through two times of temperature recovery and variable temperature freezing storage, which is more fully browned than natural frozen storage, has better flavor, and the peel is easy to peel off when eating, and at the same time realizes annual supply of the pears that are only sold in winter.

Description

technical field [0001] The invention relates to a method for frozen storage of Ruan'er pears, in particular to a method for freezing and storing Ruan'er pears at variable temperatures. Background technique [0002] Frozen pears are pears that are suitable for freezing, ripened, fermented, frozen and eaten. Ruan'er pear is a local characteristic fruit in Gansu Province. It is a kind of frozen pear. It has the effects of nourishing the lungs, relieving cough, resolving phlegm and warming the stomach. It used to be the main fruit in northern winter. There has always been a custom of eating frozen pears in northern my country. It has a history of more than one thousand years. The Khitan people in the Liao Dynasty had the habit of eating frozen pears. According to Pang Yuanying's "Wenchang Miscellaneous Records", the Khitan people "soaked the frozen pears in cold water for a long time, and the ice formed outside, and knocked them off, and the pears melted." This is when the Khi...

AI Technical Summary

Problems solved by technology

[0004] Traditionally frozen Ruaner pears are sold seasonally. Fruits are frozen in winter and sold in baskets or boxes. This sales method is greatly affected by temperature and has a small sales radius.

Once the temperature warms up, the fruit will rot and deteriorate due to the melting of frozen pears, causing great losses to storage and sales.

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