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Freeze drying method for aquatic products and freeze drying protecting agent

A technology of freeze-drying protective agent and drying method, which is applied in the field of aquatic product processing to achieve the effects of small changes in quality characteristics, reducing the loss of nutrients, and protecting the umami taste

Active Publication Date: 2014-08-06
广东环球水产食品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, how to rehydrate the freeze-dried aquatic products to maintain the original taste and appearance, and reduce the loss of nutrients such as protein is still a difficult problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0025] A kind of freeze-drying method of aquatic product, concrete steps are as follows:

[0026] 1) Pretreatment of aquatic products: wash and cut the aquatic products and remove the fat part, drain the water and add 8% freeze-drying protection agent A, after standing for 10-15 minutes, add 4% freeze-drying protection agent B , let stand for 5-20 minutes;

[0027] 2) Pre-freezing: Pre-freeze the pre-treated aquatic products at -25 to -30°C for 15-20 minutes;

[0028] 3) Vacuum freeze-drying: finally vacuum freeze-drying at a temperature of 28 Pa to 32 Pa and -35 to -45°C.

[0029] The lyoprotectant is composed of agent A and agent B, wherein agent A is bamboo vinegar solution, and agent B is a mixture of sucrose, trehalose, glycerin, mannitol and chitosan, and the specific ratio is shown in Table 1.

[0030] Table 1 Proportioning (g) of lyoprotectant B agent

[0031] Example

[0032] Mannitol

Embodiment 5

[0034] A kind of freeze-drying method of aquatic product, concrete steps are as follows:

[0035] 1) Pretreatment of aquatic products: wash and cut the aquatic products and remove the fat part, drain the water and add 5% freeze-drying protectant A, after standing for 10 minutes, add 2.5% freeze-drying protectant B, static Put 100 minutes; Lyoprotectant B agent adopts the formula of embodiment 4.

[0036] 2) Pre-freezing: Pre-freeze the pre-treated aquatic products at -25 to -30°C for 20 minutes;

[0037] 3) Vacuum freeze-drying: finally vacuum freeze-drying at a temperature of 28 Pa to 32 Pa and -35 to -45°C.

Embodiment 6

[0039] A kind of freeze-drying method of aquatic product, concrete steps are as follows:

[0040] 1) Pretreatment of aquatic products: wash the aquatic products, cut into pieces and remove the fat part, drain the water and add 10% freeze-drying protectant A, after standing for 15 minutes, add 5.5% freeze-drying protectant B, static Put for 20 minutes; Lyoprotectant B agent adopts the formula of embodiment 4.

[0041] 2) Pre-freezing: Pre-freeze the pre-treated aquatic products at -25 to -30°C for 15 minutes;

[0042] 3) Vacuum freeze-drying: finally vacuum freeze-drying at a temperature of 28 Pa to 32 Pa and -35 to -45°C.

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PUM

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Abstract

The invention relates to the technical field of processing of aquatic products and particularly relates to a freeze drying method for the aquatic products and a freeze drying protecting agent. The freeze drying method for the aquatic products comprises the following steps: (1) pre-treating the aquatic products, namely, washing and chopping the aquatic products and removing a fat part; draining off and adding 5%-10% of a freeze drying protecting agent A; standing for 10-15 minutes and adding 2.5%-5.5% of a freeze drying protecting agent B; standing for 5-20 minutes; (2) pre-freezing, namely, placing the pre-treated aquatic products under the temperature from -25 DEG C to -30 DEG C to freeze for 15-20 minutes; and (3) carrying out vacuum freeze drying: finally, carrying out the vacuum freeze drying: under the temperature from -35 DEG C to -45 DEG C at 28-32Pa. With the adoption of the method, the nutritive loss is few after the aquatic products are rehydrated; meanwhile, the umami of the aquatic products is protected well and a previous appearance condition is maintained.

Description

technical field [0001] The invention relates to the technical field of processing aquatic products, in particular to a freeze-drying method and a freeze-drying protective agent for aquatic products. Background technique [0002] Vacuum freeze-drying technology is to freeze the wet material or solution into a solid state at a lower temperature (-10°C ~ -50°C), and then sublimate the water in it directly into a gaseous state without going through a liquid state under a vacuum (1.3 ~ 13 Pa). , the drying technology that finally dehydrates the material. [0003] Due to its unique flavor, aquatic products are rich in protein and other nutrients, but these nutrients are easy to change under high temperature conditions, resulting in food spoilage. The low-temperature dehydration processing technology of aquatic products can better maintain the original quality of aquatic products. The processing of vacuum freeze-drying technology can improve the quality of aquatic products, prolo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23B4/037A23B4/20
Inventor 相兴伟万婧江玲丽章耀周向阳
Owner 广东环球水产食品有限公司
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