Frozen-dried food preserving and sterilizing method with nanometer silver film and microwave drying

A technology of microwave sterilization and silver coating film, which is applied in food preservation, meat/fish preservation with chemicals, meat/fish preservation with coating protection layer, etc. It can solve the problem of difficult microorganism control within a safe range and uneven sterilization and other problems, to achieve the effect of solving microbial safety problems, killing thoroughly, and uniformly sterilizing effect

Inactive Publication Date: 2008-03-26
JIANGNAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, microwave sterilization also has its limitations, such as uneven sterilization, which makes some food raw material microorganisms exceed the standard, so when microwave acts alone, it is difficult to control the microorganisms in food within a safe range

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: Production and application of nano-silver coating film pretreatment and microwave for uniform sterilization of freeze-dried sea cucumber

[0024] Frozen sea cucumbers are first thawed in warm water, selected, gutted, and cleaned, then soaked in nano-silver (10s, concentration 0.045ppm), drained of free water, frozen (material center temperature -25°C), freeze-dried (drying chamber pressure 100Pa, material Sublimation section temperature -18°C, cold trap temperature -50°C), microwave treatment (2.6W / g, 3-5min). The total number of colonies of the freeze-dried product obtained by this method is within 1000 per gram after culture; no discoloration occurs and no bubbles are observed after culture in the fermentation tube, that is, the coliform group (or E. coli) reaches the standard (negative).

Embodiment 2

[0025] Example 2: Production and application of nano-silver coating film combined with microwave to uniformly sterilize freeze-dried abalone

[0026] Frozen abalones are first thawed in warm water, selected, gutted, and cleaned, then soaked in nano-silver (15s, concentration 0.045ppm), drained of free water, frozen (material center temperature -25°C), freeze-dried (drying chamber pressure 100Pa, material Sublimation section temperature -18°C, cold trap temperature -50°C), microwave treatment (2.6W / g, 3-5min). The total number of colonies of the FD product obtained by this method is within 1000 / g after culture; no discoloration occurs and no bubbles are observed after culture in the fermentation tube, that is, the coliform group (or E. coli) reaches the standard (negative).

Embodiment 3

[0027] Example 3: Production and application of nano-silver coating film combined with microwave to uniformly sterilize freeze-dried strawberries

[0028] Fresh strawberries are firstly selected, cleaned, and deassociated, then soaked in nano-silver (10s, concentration 0.045ppm), drained of free water, frozen (material center temperature -25), freeze-dried (drying chamber pressure 100Pa, material sublimation temperature - 18°C, cold trap temperature -50°C), and finally microwave treatment (2.6W / g, 3-5min). The total number of colonies of the FD product obtained by this method is within 1000 / g after culture; no discoloration occurs and no bubbles are observed after culture in the fermentation tube, that is, the coliform group (or E. coli) reaches the standard (negative).

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PUM

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Abstract

The present invention relates to a quality-assuring sterilization method of freeze-dried food by adopting combination of nano silver film-coating technique and microwave drying technique, belonging to the field of food safety control technology. Said method includes the following steps: selecting freeze-dried food raw material, defrosting, cleaning, coating film with nano silver, freezing, freeze-drying, microwave treatment and packaging.

Description

technical field [0001] The invention relates to a method for uniformly sterilizing freeze-dried food with safe dose of nano-silver coating film pretreatment and microwave, which belongs to the technical field of food safety control. Background technique [0002] Frozen food is becoming more and more popular, because the vacuum freeze-drying technology overcomes the lack of quality of food processed by traditional processing methods, so that the product quality can maximize the color, flavor, shape and nutritional content of the food, and the rehydration is very good. But freeze-dried food also has some disadvantages, such as high operating costs, long production cycle, and difficult to control microorganisms. In terms of microbial control, the latest method is continuous electric heating Pasteur sterilization, but because of its expensive equipment, or the processing fee charged for subcontractor processing, the cost of this product has been virtually increased. General fre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23L3/36A23L3/358A23L3/26A23L3/44A23B7/16A23B7/157A23B7/015A23B7/024A23B7/04A23B4/015A23B4/10A23B4/06A23B4/037A23B4/24
Inventor 张慜李新林段续孙东伟孙东风
Owner JIANGNAN UNIV
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