CN1284464C - Pear preserving method by freezing - Google Patents

Abstract

The present invention relates to a storage method of fruits, more specifically, a storage method of A pears by freezing. The present invention comprises the following steps: a. surface purification processing: a pears to be stored are washed with clear water for 2 to 3 minutes, and the temperature of the water is from 10 to 20 DEG C; after being cleaned, the A pears are put into a clean basket or box for storage; b. deep freezing at low temperature: the A pears are deep frozen at a storage area with the ambient temperature of lower than-15 DEG C until the color of the external skin with the thickness of 0.2 to 0.3 centimeter of the A pears becomes into black or brown, and the pulp is kept to be white; c. alternating temperature storage at relative high temperature: the deep frozen A pears are stored at a storage area with the ambient temperature of-5 to-10 DEG C. By the method, a temperature index for low-temperature freezing, a storage index for alternating temperature storage and an external shape characteristic index for freezing are specified. The method not only is the improvement of the existing natural freezing methods, but also is the exploration of commercialization application. By the method, not only the storage period of A pears is prolonged, but also the adapted field for processing A pears is extended.

Description

Pear preserving method by freezing

Technical field:

The present invention relates to a kind of fruit storage method, specifically a kind of pear preserving method by freezing.

Background technology:

The peace pears claim sour pears again, and the little acid of its taste is with sweetly in the acid, and the Appetizing spleen-tonifying of food produces refreshing effect to the mind.At present, mostly the method for storage peace pears is after the peace pears are plucked autumn, cellar for storing things storage before freezing winter, and long pot life is to April next year, and after April, the cellar for storing things storing temperature raises, the pulp faceization, fruit juice reduces, and it is bitter that fruity becomes, and loses edibility until decayed fruit.Owing to still there is not feasible peace pears storage method at present, cause pacifying pears processing only be confined to fruit juice, can, sweet stack etc. a few, though eat raw is the best approach of edible peace pears, and the seasonal period of eating raw is very short, and its special tart flavour has many people to dislike again.

Summary of the invention:

Purpose of the present invention aims to provide a kind of pear preserving method by freezing, to increase peace pears flavor quality and to prolong the edible phase, reaches the best unloading of lasting maintenance, commercial exploitation and natural products opportunity.

The technical scheme that realizes the foregoing invention purpose is: this pear preserving method by freezing is undertaken by following step:

A, surface cleaning are handled: will treat that storage peace pears wash with clear water, water temperature is 10-20 ℃, cleans 2-3 minute, washes to be placed in clean basket or the case and waits to store up;

B, low temperature deep colling: the storage place storage below environment temperature-15 ℃ is to pacifying the pears deep colling, and crust 0.2-0.3 centimetre of thickness color becomes black or yellowish-brown, and pulp keeps white;

C, relatively-high temperature storage: it is to preserve in-5～-10 ℃ the storage place that the peace pears of deep colling are placed environment temperature.

According to the described pear preserving method by freezing of this case, standard cryogenic freezing temperature index, temperature swing storage index and freezing resemblance index, be not only improvement, the exploration of commercialization purposes especially to original natural freezing mode.This method not only makes peace pears shelf time prolong, and has enlarged peace pears processing adaptation field, makes this local flavor change over slaking and commercialization, especially suitable summer is edible, and heat is driven in cooling, keeps natural flavour mountaineous, have remarkable improvement than fresh-keeping peace pears, can also substitute cold drinks such as ice cream, ice cream.

The specific embodiment

Below in conjunction with embodiment in detail the present invention is described in detail.

Its step of the described pear preserving method by freezing of present embodiment is as follows:

1, selects the storage place: can be the shady and cool shady open-air place of storehouse, freezer or the back of the body.Select the place of shading for use in the open in the north, can reduce the storage cost, but select the storage that shades for use in the open, must before spring-5 ℃, be transferred to freezer and preserve.

2, surface cleaning is handled: will treat that storage peace pears wash with clear water, water temperature is 10-20 ℃, cleans 2-3 minute, washes to be placed in clean basket or the case and waits to store up.

3, low temperature deep colling: storage is 20 days in environment temperature is-20 ℃ freezer, and the peace pears are deep colling, standard feature: about hard unanimity, and crust 0.2-0.3 centimetre of thickness color becomes black or yellowish-brown, and pulp keeps white.Should be noted that it then is that long-term transition low temperature and drying cause that crust surpasses 0.5 centimetre of thickness blackening.If freezing back color of the leather is more shallow generally is to lack alternating temperature to stimulate, and improves storage temperature and gets final product.

4, relatively-high temperature temperature swing storage: the peace pears of above-mentioned deep colling are transferred to environment temperature for variable temperature storage in-5 ℃ the freezer, had both saved the storage cost, promote local flavor to improve again.

By the peace pears that this method stores, its edible optimal period should be summer.When edible, the peace pears with deep colling deiced with cold water soak 30-60 minute earlier, and are edible then.The edible optimum temperature of peace pears should be at 5-8 ℃, and the peace pears local flavor sour-sweet of this moment has more natural flavour mountaineous than fresh-keeping peace pears.

Claims (2)

1, a kind of pear preserving method by freezing, this method step is as follows:

A, surface cleaning are handled: will treat that storage peace pears wash with clear water, water temperature is 10-20 ℃, cleans 2-3 minute, washes to be placed in clean basket or the case and waits to store up;

B, low temperature deep colling: the storage place storage below environment temperature-15 ℃ is to pacifying the pears deep colling, and crust 0.2-0.3 centimetre of thickness color becomes black or yellowish-brown, and pulp keeps white;

C, relatively-high temperature storage: it is to preserve in-5～-10 ℃ the storage place that the peace pears of deep colling are placed environment temperature.

2, pear preserving method by freezing according to claim 1 is characterized in that described storage place can be the shady and cool shady open-air place of storehouse, freezer or the back of the body.