CN102475135A - Processing method for Chinese wolfberry fresh fruits by quick freezing - Google Patents

Abstract

The invention discloses a processing method for quickly freezing Chinese wolfberry fresh fruits, in particular quick-frozen Chinese wolfberry fresh fruits which are processed with a special process and a production method of the quick-frozen Chinese wolfberry fresh fruits. The technical field of the invention is frozen food processing for raw and fresh fruits and vegetables. The invention is characterized in that during the processing, special exogenous non-specific biological cell protection and tissue component stabilization processing are carried out, high standards of pollution-free treatment are implemented, quick freezing scheme is optimized, and final products are packaged with various methods such as packaging under a controllable atmosphere, so that freezing damage and deterioration during storage and transportation are minimized. The technical system provides suggestions for circulation of Chinese wolfberry fruits, and the prejudice that Chinese wolfberry fruits should not be frozen is overcome. The invention makes Chinese wolfberry fruits a widely well-received resource with oriental flavor in modern frozen food culture. The invention provides a technical scheme for industrialization of Chinese wolfberry, so that storage and selling of Chinese wolfberry fresh fruits all the year round can be realized.

Description

A kind of processing method for quick-freezing of medlar fresh fruit

Technical field

The present invention relates to the fresh frozen food processing of fruits and vegetables class.Be particularly related to a kind of quick-frozen manufacture field of medlar fresh fruit.

Background technology

Through the patent retrieval keyword: advanced search and IPC systematic searchings such as matrimony vine, medlar fresh fruit, quick-frozen medlar fresh fruit, medlar fresh fruit quick-frozen do not retrieve qualified record.Disclose, use the record that the condition that meets the technical scheme that the present invention relates to is not arranged in disclosing and otherwise disclosing at publication.

Summary of the invention

The invention discloses a kind of processing method for quick-freezing of medlar fresh fruit, the quick-frozen medlar fresh fruit and the method thereof of particularly processing through special process.Affiliated technical field is the fresh frozen food processing of fruits and vegetables class.

In known general technological opinion in the industry, there is the cognition and the prejudice of two aspects, on the one hand in the practice of the quick-frozen processing of inquiring into medlar fresh fruit; Do not take necessary processing technology, usually go base of a fruit cleaning, precooling and quick-frozen processing, infiltrate in the fruit in a large number owing to clean moisture content; Seriously jeopardize food security; And the infiltration of excessive water, becoming in the solid phase process by liquid phase, cubical expansivity is up to 9%; The vast scale of ice crystal in the space between cells increase to enlarge, freezing injury such as cause that the mechanical damage of cell is broken; Quick freezing temperature and speed fail to satisfy the requirement of freezing of middle part of fruit part high concentration juice simultaneously, thereby histologic lesion and the loss of the juice in the course of defrosting in the freezing process inevitably occur, and the quality corruption is soft, and local flavor loses to the greatest extent.So; Though existing other quick-frozen fresh fruit emerges, fail to accomplish breakthrough in theory with in the practice to prior art, fail to form effective market effect; Ubiquity in the field of business the technological prejudice of the unsuitable quick-frozen processing of medlar fresh fruit, seriously restricts the development of matrimony vine industry.

The object of the invention is exactly for overcoming a kind of quick-frozen medlar fresh fruit and the production method thereof through special process processing that above-mentioned deficiency is studied.Its technical characterictic that prior art is made creative contribution is: opened up new cognitive domain theoretically, from practice, created new process combination, thereby accomplished the purpose of invention, below done detailed description.

Aspect theoretical, the food freezing temperature of known routine is about-25～-35 ℃, thereby the moisture content in the frozen food is not freezed the also remaining high concentration juice that does not freeze on a small quantity fully.Require fresh fruit to include the moisture freeze all of high dissolubility material, no longer exist ice crystal and separate out, must drop to eutectic point or following to the solidification point of fruit fast, the eutectic point of food tissue is about-55～-65 ℃.

Just can freeze to solidify in eutectic point when concentration that it should be noted that solution in the food tissue only is incremented to the desired concentration of eutectic liquid, water also be frozen into solid with the salt cocrystallization that it dissolves.Nonspecific protection of cell can be familiar with theoretically that concentration increases progressively in the tissue fluid for biological tissue's protective agent has been facilitated.

More than two important theory understanding constituted the main points of two important procedures:

1, import exogenous organization protection liquid, appropriateness protection product tissue is realized rationally increasing progressively of tissue fluid concentration; The built-in quality of cell tissue is able to protection in process, plasm is impaired slight, and plastid is complete; The tonoplast structure is complete basically, and static pressure changes less than the state of being untreated in the cell.Thereby the histologic lesion that realization farthest alleviates the quick-frozen process;

2, introduce liquid nitrogen and liquid carbon dioxide quick-frozen system, make the whole temperature of product reach-55 ℃ or following, reach and surpass the eutectic point temperature requirement, the freeze all of realization tissue fluid has farthest alleviated the histologic lesion in the course of defrosting.

Developing meaning of the present invention has been to illustrate theoretically the process of the histiocytic exogenous non-specific protection of medlar fresh fruit in the cryogenic quick-freezing processing; Disclose in the fresh fruit tissue in this course whole moisture content and realized the essential principle of phase transformations; And then the industrial step that possibly implement to intervene proposed; And include in the corresponding process system and implement; Thereby constituted the technical scheme of the complete innovation of medlar fresh fruit cryogenic quick-freezing processing as core, fundamentally reversed the technological prejudice that it is believed that the unsuitable quick-frozen of matrimony vine, for the commercial application of medlar fresh fruit has been started a wide road; The sample of experimental stage enjoys showing great attention to of the bodyguard of people in the industry that comprises Europe, Hong Kong.This brand-new thinking platform of matrimony vine circulation; Make the matrimony vine berry be about to become the new resources that are rich in the very popular integration of drinking and medicinal herbs of oriental color in the culture of Modern World frozen food; In the very long industrialization process of Chinese matrimony vine, proposed first to supply industrialized comparatively perfect technical scheme, thereby realized storing the whole year of medlar fresh fruit the ideal of annual listing.

The specific embodiment

Details are as follows to realize technical scheme of the present invention:

1, adopts preceding quality control

Adopt preceding 5d-7d, it is plain that fruit branch sprays biological plantibody on the matrimony vine blade face, and concentration is 600 times of 200ml dilutions, starts and plants body self disease resistance immunity, reduces the field and infects, and reduces the disease inoculum, suppresses the expansion and the propagation of cause of disease.Spray 0.5% U-Ramin MC simultaneously, strengthen fruit tissue;

2, the control of gathering

The manual work band base of a fruit is plucked, and requires fruit maturation appropriate, and no insect pest, deformity, disease, machinery wound, the softening fruit of pectin are Gu the acid ratio is greater than 25:1.Require good and bad shunting in gathering, avoid a large amount of dogberries to sneak into.Concentrate collect after, get into immediately in the vacuum decompression damping device and handle 20～30min, require that strict control dehydration rate is less than 1% in precooling and the field heat elimination process, really temperature should be between 8-15 ℃ before the warehouse-in;

3, go into library management

48h must accomplish storehouse body and environment disinfected before the warehouse-in, opens and closes Ku Men after the storehouse body ventilated 12 hours, and storehouse body precooling is to 6-8 ℃, and the starting ozonization equipment, and storehouse body humidity should be greater than 95%;

Put in storage through the fresh fruit of precooling, the storehouse temperature must not fluctuate greater than+3 ℃ perhaps-1 ℃ in batches; In the storehouse, carry out elementary sorting, subsequent use after the sorting;

4, organize stabilization processes

Be configured to down the treatment fluid of prescription with aseptic purifying waste water, soak fresh fruit 5～l0min:

Biology protects pigment 0.1-0.5% anti-oxidant 0.1-0.5%

Cacl2 1 ~ 3% liquid temperature 6-8C

Through above processing, entry is first cleaned, and reaches carrotene, zeaxanthin, kryptoxanthin and the physalin of stabilizing tissue brittleness, stable hydrophilic property pigment, particularly trophism;

Take out to leave standstill after soaking and stablize 30min～60min, tissue is fully absorbed:

5, the residual and disease green non-pollution processing of agricultural residual medicine

The Industrial cleaning facility gas generator; Gas production 6.4g～l0.0g/h produces treatment fluid and contains O3 concentration and reach 4.0ppm, and conveyer belt is sent into matrimony vine, cleans 5min～l0min; This degraded of the residual medicine residue of farming is complete; Surface bacteria, virus, mould are removed up to standard basically, and coliform and staphylococcus aureus all do not detect, and endogenous ethylene is decomposed by efficient.Realization wide spectrum, green efficient, quick, pollution-free, noresidue are handled;

6, draining

Handle with mechanical type draining machine, drop goes to the surface water stain.The wind dehydration, wind speed 3m～5m/s

7, base of fruit removes and sorting

Less than 15 ℃, relative humidity is carried out the base of fruit manual work and is removed greater than 98% in the workshop of aseptic 100,000 grade standards, carry out final election in the workshop condition temperature, chooses to remove and damages fruit and foreign material;

By following grade sorting: the one-level fruit less than 10/lOg secondary fruit greater than 11/l0g

8, the biological cell protection is handled

Prepare with sterilized water: citric acid 0.1～0.4% L. malic acid 0.1～0.4%

Biological color stabilizer 0.05～0.1% Cacl2 0.1～0.5% sucrose 0.5～10%

Ethyl maltol 0.1% Ethyl vanillin 0.1% Vc 0.25%

Solution after the preparation joins in the biological cell protection liquid of 30-60%, liquid temperature control 6 ~ 8C, and soak time needs to confirm with coming into the market by the finished product kind, does not wait from 6min-6h.The processing environment temperature is 5～8 ℃;

9, hanging clothing handles

Avoid adhesion for product in individual quick freezing, need hang clothing and handle, the strict 1min of being controlled at of this operation carries out with interior, must not surpass 2min;

Prescription: ethyl Sucralose 0.33% citric acid 0.05% L. malic acid 0.05%

Ethyl maltol 0.05% Ethyl vanillin 0.05% Vc 0.25% Nisin 0.2%

Draining immediately after the processing, the preferred oscillatory type draining of machine drop machine, wind dehydration 3m～5m/s

10, precooling

Precooling temperature requires the matrimony vine central temperature to reach 1 ℃～5 ℃, precooling envionmental humidity 98～100%

11, monomer I QF

Quick freezing-55 ℃～-75C 7～12min

Rationally control initial temperature, whole gentle freezing speed are paid special attention to wind speed control in the anti-dehiscent fruit;

12, deironing impurity elimination:

The impurity elimination of finished product de-iron is fast through metal detector and nonmetal X-ray examination system.Remove and damage fruit.The workshop temperature requirement is lower than-5 ℃;

13, packing:

The packing of weighing in 0 ℃～workshop below-5 ℃.Preferred with controlled controlled atmosphere (MAP) packing, can significantly alleviate the quality infringement in the transporting procedures;

14, ℃ of-3 ℃ relative humidity 95-98% storehouse temperature of cold storage-20 of guaranteeing the quality are stable, forbid fluctuation, at controlled controlled atmosphere

12 months following shelf-lifves of packed state, under other packed state 10 months.

Transportation is guaranteed the quality :-18 ℃ of refrigerator cars or container

Sale is guaranteed the quality :-18 ℃ of refrigerator-freezers

The product Quality Control:

The color and luster matrimony vine should have color and luster, the scarlet mouthfeel sweet and sour palatability of fresh fruit, matrimony vine local flavor

Impurity does not allow

The temperature central temperature keeps below-18 ℃

Sanitary standard GB8863-88, GB2762-81, GB2763-81GB4788-84. GB4810 – 84, GB7718-87 are with reference to FDA CARA/RCP8-1976 EEC.

Claims (1)

1. the processing method for quick-freezing of a medlar fresh fruit is characterized in that, two important theory understanding have constituted the main points of two important procedures:

(1), imports exogenous organization protection liquid; Appropriateness protection product tissue is realized rationally increasing progressively of tissue fluid concentration, and the built-in quality of cell tissue is able to protection in process; Plasm is impaired slight; Plastid is complete, and the tonoplast structure is complete basically, and static pressure changes less than the state of being untreated in the cell;

Thereby the histologic lesion that realization farthest alleviates the quick-frozen process;

(2), introduce liquid nitrogen and liquid carbon dioxide quick-frozen system, make the whole temperature of product reach-55 ℃ or following, reach and surpass the eutectic point temperature requirement, the freeze all of realization tissue fluid has farthest alleviated the histologic lesion in the course of defrosting.