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Method for unfreezing foods by ultrasonic-assisted microwaves

An ultrasonic and microwave technology, applied in food ultrasonic treatment, food preservation, food science, etc., can solve the problem of large meat juice loss, achieve the effect of enhancing heating uniformity and avoiding excessive heating

Active Publication Date: 2020-12-08
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this treatment method uses a water bath and ultrasonic waves to further thaw and clean the meat after microwave thawing. However, the meat is directly in contact with water, and the gravy will lose a lot. This technology has obvious problems.

Method used

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  • Method for unfreezing foods by ultrasonic-assisted microwaves
  • Method for unfreezing foods by ultrasonic-assisted microwaves
  • Method for unfreezing foods by ultrasonic-assisted microwaves

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take out 500g pork tenderloin frozen at -18°C for more than 24h from the refrigerator, place it on the thawing disk in the microwave cavity, and use intermittent microwave output to thaw the meat, with an output power of 500W. After 4 minutes of microwave action, turn on the ultrasound with a frequency of 20kHz, an output power of 1000W, and an action time of 15 minutes. The total thawing time is 19 minutes. The specific microwave and ultrasonic output modes are shown in Table 1.

[0028] Table 1 Embodiment 1 Microwave and ultrasonic output mode

[0029]

[0030]

[0031] After thawing, the meat block is completely thawed, and there is no overheated or overcooked area on the surface.

Embodiment 2

[0044] Take out 500g pork tenderloin frozen at -18°C for more than 24h from the refrigerator, place it on the thawing disk in the microwave cavity, and use intermittent microwave output to thaw the meat, with an output power of 500W. After 3 minutes of microwave action, turn on the ultrasound with a frequency of 40kHz, an output power of 1000W, and an action time of 20 minutes. The total thawing time is 23 minutes. See Table 5 for specific microwave and ultrasonic output modes.

[0045] Table 5 Example 2 microwave and ultrasonic output mode

[0046]

[0047] After thawing, the meat block is completely thawed, and there is no overheated or overcooked area on the surface.

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Abstract

The invention discloses a method for unfreezing foods through ultrasonic-assisted microwaves. The method comprises the following steps: (1) taking out to-be-unfrozen meat pieces from a refrigerator, putting the taken-out to-be-unfrozen meat pieces into a microwave cavity, unfreezing the meat pieces by adopting intermittent microwave output which consists of multiple sections of microwave output and intervals in a segmented manner, wherein in the segmentation of microwave output and intervals, the time ratio of the microwave output to the intervals is (1: 1)-(1: 6), and the microwave output time is 6-30 seconds; and 2) performing ultrasonic-assisted unfreezing in the microwave unfreezing rear section, and controlling the ultrasonic frequency to be 20-40kHz, the ultrasonic power to be 500-2000W and the treatment time to be 10-40min. According to the method disclosed by the invention, the complementary characteristics of microwaves and ultrasonics for heating frozen foods are utilized, the heating uniformity of the unfrozen s is enhanced, especially for large meat foods, the core area can be completely unfrozen in a short time, and the phenomenon that a local area is excessively heated is avoided.

Description

technical field [0001] The invention relates to a method for thawing food assisted by ultrasonic wave and microwave, in particular to a method for thawing bulk meat food by using sound wave and microwave. Background technique [0002] Traditional thawing methods, such as natural air thawing, water bath thawing, etc., take a long time to thaw, have a high rate of gravy exudation, and cause serious nutritional loss. [0003] Microwave heating has the characteristics of fast speed, convenient use, and easy control, and has been applied in the thawing of frozen foods. For example, the Chinese invention patent application 2018103905437 discloses frozen food processing equipment, including at least two discharge barrels connected to the upper part of the thawing box through a connecting plate, and a drainage pipe is provided on the bottom side of the thawing box; it also includes a circulation pump, and the side of the circulation pump The water inlet of the water inlet pipe is s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23B4/07A23L3/365A23L5/30
CPCA23B4/07A23L3/365A23L5/32A23L5/34A23V2002/00A23V2300/48Y02P60/85
Inventor 韩忠戴临雪孙大文成军虎余旭聪朱志伟
Owner SOUTH CHINA UNIV OF TECH