CN102550989A

CN102550989A - Method for preparing crispy sliced apple pears

Info

Publication number: CN102550989A
Application number: CN2012100275791A
Authority: CN
Inventors: 李英姬; 聂凤环
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-02-09
Filing date: 2012-02-09
Publication date: 2012-07-11

Abstract

The invention relates to a method for preparing crispy sliced apple pears. The method comprises the following steps of: cleaning; peeling; slicing full pears or half pears and pre-treating, wherein the slice thickness is 2 to 6mm; protecting color, namely finishing the slicing and pre-treatment process within 1 hour, or soaking in a citric acid solution at the concentration of 0.5 to 0.6 percent for 15 minutes for color protection; pre-freezing at the temperature of -35 to -45 DEG C for 2 to 3 hours; freeze-drying, namely sublimating in a cold trap at the temperature of -50 DEG C under the pressure of 100Pa and at the sublimation temperature of -5 DEG C for 7 hours, heating, raising the temperature of a hot plate to be 40 to 50 DEG C by using a program, maintaining for 4 to 5 hours, and controlling the final water content of the crispy sliced apple pears to be less than 8 percent; and packaging. Additives are not added in the preparation process; the original nutrient components of apple pears are not damaged; the original fragrant taste of the apple pears is retained; and the sliced apple pears are crispy, sour, sweet and palatable.

Description

The preparation method of the clear-cut sheet of apple pear

Technical field

The present invention relates to food processing field, specifically be meant the preparation method of the clear-cut sheet of a kind of apple pear.

Background technology

Jilin Yan Biandiqu is the major production areas of apple pear, and the apple pear aboundresources is enjoyed the title in the first apple theatre, Asia.The maximum characteristics of apple pear are that juice is abundant, and are yellowish pink milky white, moderately sour and sweet.Contain abundant vitamin C and calcium, ferrous components simultaneously, nutritious, moist, dissolving phlegm, cough-relieving are arranged, fall fire, clear away heart-fire, the effect of diuresis; Effect such as can also improve a poor appetite, aid digestion.At present, prolong the limit apple pear still with eat raw, marketing fresh is main, and is but abundant because of its juice, also give storage and carry bring many constant.Have only the preserved pears series of honey system both at home and abroad and add the pears that other compositions adopt common drying to form and do, find that as yet not adding this freeze-drying method of any other composition carries out the apple pear sheet that drying forms.

Summary of the invention

The objective of the invention is for a kind of maximum original composition, taste and color and luster, mode of appearance of keeping is provided, flavour does not add other composition, does not destroy the preparation method of the clear-cut sheet of apple pear of original nutrition.

Technical scheme of the present invention is:

The preparation method of the clear-cut sheet of a kind of apple pear, be made up of following process: apple pear cleaning, peeling, section and preliminary treatment, protect look, precooling, freeze drying and packing, wherein said section is that the thickness of section is 2 ~ 6mm with full pears or the section of half pears; Described to protect the look requirement be that section and preprocessing process were accomplished in 1 hour, then adopts 0.5 ~ 0.6% citric acid solution immersion to protect look in 15 minutes when perhaps surpassing 1 hour; Described precooling: setting the precooling temperature range is-35 ℃～-45 ℃, preferred-42 ℃, and freezing 2～3 hours; Described freeze drying condition: pressure 100Pa, cold-trap-50 ℃, sublimation temperature is-5 ℃; Kept 7 hours, and began to heat after having distilled, heating plate adopts temperature programming; The design temperature interval is 40 ℃～50 ℃, keeps 4～5 hours, and the clear-cut sheet terminal point of control apple pear water content is below 8%.

The clear-cut sheet of apple pear of the present invention is that to prolong the limit apple pear be raw material with fresh; Adopt advanced vacuum freeze-drying method to remove Free water and combination water in the apple pear; Sublimation process is to accomplish through low-temperature heat, has ensured the original nutritional labeling and the trace element of fresh apple pears to greatest extent, has promptly kept the original color of apple pear; It is crisp to be both mouthfeel, moderately sour and sweet.Because of it belongs to ecosystem, non-fried chip, in the preparation process, do not add any additives again, low fat, low in calories, high fiber, be rich in vitamin and several mineral materials, characteristics such as long shelf-life receive consumer's welcome deeply.

Compare with the fresh apple pears, the clear-cut sheet of apple pear is convenient to transportation more, and period of storage has increased by tens times at normal temperatures.Owing to adopt Physical Processing, vacuum dehydration fully, its rehydration is very good, can directly eat simultaneously, also can steep in milk to eat, and real is the healthy food of house tourism.

The specific embodiment

The preparation method of the clear-cut sheet of a kind of apple pear at first selects high-quality, uniform territory, the border district product that prolongs prolongs the limit apple pear, cleans, removes the peel;

The preliminary treatment of cutting into slices then, section are that the thickness of section is 2 ~ 6mm with full pears or the section of half pears, and described preliminary treatment is meant that the apple pear sheet after the section is placed on the basin of freeze drying equipment one by one, and each sheet surface is contact drying dish fully;

Then protect look, protect look and can adopt a kind of in the dual mode, a kind of mode to guarantee that section and preprocessing process accomplished in 1 hour; Another kind of mode is when section and pretreatment time surpass 1 hour, then adopts 0.5 ~ 0.6% citric acid solution to soak the apple pear section and protects look in 15 minutes, and then put and carry out preliminary treatment;

Then carry out precooling: setting the precooling temperature range is-35 ℃～-45 ℃, preferred-42 ℃, and freezing 2～3 hours;

Then carry out freeze drying: the freeze drying condition: pressure 100Pa, cold-trap-50 ℃, sublimation temperature is-5 ℃; Kept 7 hours; Begin after having distilled to heat, heating plate adopts temperature programming, and the design temperature interval is 40 ℃～50 ℃; Kept 4～5 hours for preferred 50 ℃, the clear-cut sheet terminal point of control apple pear water content is below 8%; The present invention takes vacuum freeze-drying method to carry out freeze drying with freeze drying box, and the model that vacuum freeze drier equipment can select for use speed former middle day Science and Technology Ltd. in Beijing to produce is the GZL-10 vacuum freeze drier;

Packing at last: the clear-cut sheet of apple pear takes out from the vacuum refrigeration lyophilizer, cools naturally to pack to the room temperature to get final product, and packing specification is every pouch 10g, every sack 200g.

Claims

1. the preparation method of the clear-cut sheet of apple pear is made up of following process: apple pear cleaning, peeling, section and preliminary treatment, protect look, precooling, freeze drying and packing, it is characterized in that

Described section is that the thickness of section is 2 ~ 6mm with full pears or the section of half pears;

Described to protect the look requirement be that section and preprocessing process were accomplished in 1 hour, then adopts 0.5 ~ 0.6% citric acid solution immersion to protect look in 15 minutes when perhaps surpassing 1 hour;

Described precooling: setting the precooling temperature range is-35 ℃～-45 ℃, freezing 2～3 hours;

Described freeze drying condition: pressure 100Pa, cold-trap-50 ℃, sublimation temperature is-5 ℃; Kept 7 hours, and began to heat after having distilled, heating plate adopts temperature programming; The design temperature interval is 40 ℃～50 ℃, keeps 4～5 hours, and the clear-cut sheet terminal point of control apple pear water content is below 8%.

2. the preparation method of the clear-cut sheet of a kind of apple pear according to claim 1 is characterized in that described precooling temperature is-42 ℃.