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Liquid nitrogen flash freezing method for swimming crabs

A liquid nitrogen quick-freezing and swimming crab technology, which is applied in the direction of freezing/cooling preservation of meat/fish, food preservation, food science, etc., can solve the problem of affecting the appearance quality of swimming crab frozen products, can not prevent swimming crab color change, poor elasticity and strength of ice coat and other problems, to achieve good appearance quality, improve appearance quality, and prevent frost cracking

Active Publication Date: 2019-02-19
MARINE FISHERIES RES INST OF ZHEJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This quick-freezing method has the following defects: (1) the whole body of the swimming crab is wrapped by a hard shell, and the low-temperature protective agent is difficult to enter the swimming crab through the crab shell during soaking, and the soaking and antifreezing effect is poor; Then place the quick-frozen swimming crabs in ice water containing ice-coating agent to coat the surface of the swimming crabs with a layer of ice coating. When the swimming crabs are quick-frozen, they first start from the shell so that the shell first freezes, hardens and becomes brittle (the mechanical strength of the crab body becomes poor) Therefore, freezing first will cause the frozen swimming crab shell to be difficult to withstand the expansion pressure generated by the internal freezing of the swimming crab, which will easily cause cracks or bulges, and there is still a high rate of freezing cracks (8%); (3) Freezing The final swimming crabs are placed in ice water containing ice coating agent to coat the ice coat. The thickness of the ice coating is not easy to control, and when the swimming crabs are taken out of the ice water, ice will be formed, which will affect the appearance quality of the swimming crabs. In addition, the resulting ice The clothing has poor elasticity and strength, and it is easy to fall off when colliding; (4) The formed ice clothing only has the effect of isolating the swimming crab from the outside world, and cannot prevent the color change of the swimming crab

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Cleaning: wash fresh swimming crabs with water, and drain;

[0030] (2) Pore-causing: place the swimming crab in step (1) in an acid solution with a temperature of 0°C and soak for 1 hour, then remove and drain, the acid solution is an acetic acid solution with a mass concentration of 3%, the mass concentration of the swimming crab and the acid solution The ratio is 1:10;

[0031] (3) Soaking liquid: put the Portunus in step (2) into the cryoprotective solution with a temperature of 0°C and soak for 0.5h, then remove and drain. The cryoprotective solution consists of the following components in mass percentage: 3% Sucrose, 0.03% sodium ascorbate, 0.03% sorbitol, the balance is water, and the mass ratio of portunus and cryoprotective liquid is 1:5;

[0032] (4) Ice-coating: Put the swimming crabs soaked in the ice-coating solution at 0-3°C, remove them, drain them until there are no droplets, and place them in liquid nitrogen at -40-45°C, and wait for the crabs to b...

Embodiment 2

[0036] (1) Cleaning: wash fresh swimming crabs with water, and drain;

[0037] (2) Pore-causing: the swimming crab in the step (1) is placed in the acid solution with a temperature of 5° C. and soaked for 1.5 h, then fished out and drained. The acid solution is an acetic acid solution with a mass concentration of 4%. The mass ratio is 1:7. ;

[0038] (3) Soaking liquid: put the Portunus in step (2) into the cryoprotective solution with a temperature of 2°C and soak for 0.7h, then remove and drain. The cryoprotective solution consists of the following components in mass percentage: 4% Sucrose, 0.04% sodium ascorbate, 0.04% sorbitol, the balance is water, the mass ratio of portunus and cryoprotective liquid is 1:3.5;

[0039] (4) Ice-coating: Put the swimming crabs soaked in the ice-coating solution at 0-3°C, remove them, drain them until there are no droplets, and place them in liquid nitrogen at -42°C, and coat the swimming crabs with ice-coating After picking up immediatel...

Embodiment 3

[0043] (1) Cleaning: wash fresh swimming crabs with water, and drain;

[0044] (2) Porogenation: the swimming crab in step (1) is placed in the acid solution with a temperature of 10° C. and soaked for 2 hours, then fished out and drained. The acid solution is an acetic acid solution with a mass concentration of 5%. The mass concentration of the swimming crab and the acid solution The ratio is 1:5;

[0045] (3) Soaking solution: Soak the Portunus in step (2) in a freezing protection solution with a temperature of 10°C for 1 hour, remove and drain, and the freezing protection solution consists of the following components in mass percentage: 5% sucrose , 0.05% sodium ascorbate, 0.05% sorbitol, the balance is water, and the mass ratio of portunus and frozen protection liquid is 1:5;

[0046] (4) Ice-coating: Put the swimming crabs soaked in the ice-coating solution at 3°C, remove them, drain them until there are no droplets, and place them in -45°C liquid nitrogen. After the swi...

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PUM

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Abstract

The invention relates to the technical field of freezing and refreshing of aquatic products, in particular to a liquid nitrogen flash freezing method for swimming crabs. The method comprises the following steps of 1, cleaning; 2, pore formation; 3, immersion; 4, ice glazing; 5, average-temperature liquid nitrogen flash freezing; 6, vacuum packaging. The technical steps are easy, the process is stable and controllable, the operability is high, the frozen cracking rate of the frozen swimming crabs obtained by using the method is low, the ice is uniform in thickness and not likely to peel off, and the frozen swimming crabs are good in appearance quality.

Description

technical field [0001] The invention relates to the technical field of frozen and fresh-keeping aquatic products, in particular to a liquid nitrogen quick-freezing method for swimming crabs. Background technique [0002] Swimming crab meat is tender and tender, delicious, high in protein content, rich in essential fatty acids and vitamins A and D, and is loved by Chinese people. It is also one of the main aquatic products that my country exports to earn foreign exchange. Swimming crabs are regarded as an important aquatic resource in China, but because their muscles are rich in protein, fat and various minerals, they are easily spoiled after death, and crab meat will also experience muscle "gelatinization". In order to reduce the quality deterioration of swimming crabs and inhibit the gelatinization of muscle fibers, low-temperature freezing storage methods are usually adopted. The commonly used methods for cryogenic freezing of swimming crabs include plate quick freezing, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23B4/09A23L3/375
CPCA23B4/09A23L3/375
Inventor 张小军许文军陈思许丹
Owner MARINE FISHERIES RES INST OF ZHEJIANG
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