Microwave vacuum preservation method for grains

A fresh-keeping method, microwave vacuum technology, applied in the application field of grain storage and fresh-keeping, can solve the problems of long cooling time, secondary pollution, etc., achieve high production efficiency, fast cooling speed, and facilitate continuous production

Inactive Publication Date: 2012-02-01
HUAZHONG AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Applying both microwave and vacuum technology to grain preservation can solve the problems of long

Method used

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  • Microwave vacuum preservation method for grains
  • Microwave vacuum preservation method for grains
  • Microwave vacuum preservation method for grains

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1 invention process example

[0024] Take rice microwave vacuum packaging preservation as an example. 2kg of newly processed rice is packed into a packaging bag with an opening on one side, and the specification is 30cm × 20cm. One of the side openings is 20cm wide, and the other three sides are sealed. The packaging bag material is polyester and polypropylene composite plastics. The first step is to seal with a heat sealing machine. When sealing, place a high-temperature-resistant comb-shaped mold between the upper and lower layers of the opening of the packaging bag. Remove the mold to make the packaging bag not completely closed. Leave a 1mm-diameter mold every 1cm. A total of 18 vents are reserved; the second step is to put the bag containing the grain in the microwave oven (produced by Nanjing Benhe Microwave Technology Development Co., Ltd., Jiangsu Province, PLC controlled intelligent microwave oven), at 0.17kW / kg Under the power of microwave irradiat...

Embodiment 2

[0025] Embodiment 2 Vacuum cooling effect example

[0026] Take rice microwave vacuum packaging preservation as an example. Complete the microwave vacuum fresh-keeping process of rice according to the method in Example 1, only change the vacuuming time, and compare the cooling effect of different vacuuming time on microwave irradiation rice. See Table 1.

[0027] The cooling effect (raw material: rice) of different vacuum pumping time of the present invention of table 1

[0028] Vacuum time (s)

Embodiment 3

[0029] Example 3 Microwave Vacuum Preservation Effect Example

[0030] Take rice microwave vacuum packaging preservation as an example. This example is completed according to the method in Example 1. The results showed that there was no significant change in the appearance and nutritional components of rice after microwave irradiation treatment and vacuum packaging treatment. After three months of storage, the water loss of the rice was small, and the appearance quality, nutritional components and rice flavor had no obvious changes. Table 2 shows the microwave vacuum preservation effect of rice.

[0031] Microwave vacuum preservation effect of the present invention (raw material: rice) of table 2

[0032]

[0033]

[0034] Note: No. 1 is microwave + vacuum treated rice; No. 2 is control, untreated rice; No. 3 is rice stored for three months after microwave + vacuum treatment; No. 4 is control, untreated rice stored for three months Rice: 10 points for each sensory scor...

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Abstract

The invention specifically relates to a microwave vacuum preservation method for grains, which belongs to the technical field of food preservation. The method comprises the following steps that: firstly, grains are filled in a packaging bag which allows microwave to permeate and has a good gas barrier property, one side of the packaging bag is provided with an opening, the rest sides of the packaging bag are sealed, grains are filled into the packaging bag through the opening, a comb-shaped high temperature resistant die is arranged between the upper layer and the lower layer of the opening, a sealing machine is used for primary sealing, 3 to 120 breathing outlets with a diameter of 0.5 to 1.5 mm are reserved in advance at a sealing place, and the spacing between two adjacent breathing outlets is 0.5 to 3 cm; secondly, the packaging bag is placed in a microwave device for treatment so as to allow the grains to have a surface temperature of 54 to 65 DEG C when the grains come out from the microwave device, and then the packaging bag is treated under the conditions of a degree of vacuum of 0.08 to 0.095 MPa and a cooling speed of 0.09 to 0.35 DEG C/s for 15 to 45 s to enable the grains have a surface temperature of 36 to 51 DEG C; finally, all the breathing outlets in the packaging bag are sealed. The invention enables the defect that cooling time in the existing cereal microwave insect and mildew inhibiting technology is too long to be overcome, thereby avoiding a hidden trouble of secondary pollution.

Description

technical field [0001] The invention belongs to the technical field of grain storage and preservation, and in particular relates to an application of microwave and vacuum packaging technology in grain storage and preservation, so as to improve the preservation quality of grains. Background technique [0002] Insect damage, mildew and staleness are key issues in grain storage. Finding effective ways to prevent insects, mildew and delay aging has always been the direction of efforts in the field of grain storage and preservation. Chemical fumigant is a common method to control pests in grain storage, but long-term use will affect the flavor of grain, human health and environmental protection. Low-temperature storage and controlled-atmosphere storage can effectively prevent grain mildew, delay aging, and prolong the freshness period of grain, but the equipment consumes a lot of energy, requires high auxiliary facilities, and costs high, and can only inhibit the growth of pests...

Claims

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Application Information

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IPC IPC(8): A23B9/00A23B9/06A23B9/20
Inventor 赵思明熊善柏谢静刘茹刘友明荣建华
Owner HUAZHONG AGRI UNIV
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