Infrared hot air drying method of fistular onion stalks pretreated through union of vacuum and ethanol

A hot air drying and pretreatment technology, applied in food drying, application, food preservation, etc., can solve the problems of long drying time, complicated equipment operation, short storage period, etc., to improve the efficiency of osmotic dehydration, solve environmental pollution, increase ventilation The effect of permeability

Inactive Publication Date: 2019-11-15
CHUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the fact that the traditional sodium hypochlorite sterilization forms a class of carcinogenic chlorinated organic compounds such as chloroform, carbon tetrachloride, and dioxin, causing the second pollution of the environment, and there is also a large amount of waste of water resources. Although the products produced by hot air drying are expensive It is cheap but has poor quality, problems such as short storage period, high production cost, complicated equipment operation and long drying time, so the present invention is proposed

Method used

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  • Infrared hot air drying method of fistular onion stalks pretreated through union of vacuum and ethanol
  • Infrared hot air drying method of fistular onion stalks pretreated through union of vacuum and ethanol
  • Infrared hot air drying method of fistular onion stalks pretreated through union of vacuum and ethanol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Select fresh scallions with no mechanical damage on the surface and no pests to remove the outer skin, wash, and cut into sections with a thickness of 5mm. Place them in 75% ethanol at 25°C and put them in a vacuum with a vacuum degree of 0.3bar. Vacuum treatment in the box for 10 minutes, and then carry out infrared hot air drying at a drying temperature of 60°C and a wind speed of 2m / s, and stop drying when the water content of the scallion white is lower than 7%, to obtain the final scallion ring sample. Determination of rehydration and microbial content of scallions after drying. For the specific detection method, refer to Comparative Example 1.

Embodiment 2

[0050] Select fresh scallions with no mechanical damage on the surface and no pests to remove the outer skin, wash, and cut into sections with a thickness of 5mm. Place them in 80% ethanol at 25°C and put them in a vacuum with a vacuum degree of 0.6bar at the same time. Vacuum treatment in the box for 10 minutes, and then carry out infrared hot air drying at a drying temperature of 60°C and a wind speed of 2m / s, and stop drying when the water content of the scallion white is lower than 7%, to obtain the final scallion ring sample. Determination of rehydration and microbial content of scallions after drying. For the specific detection method, refer to Comparative Example 1.

Embodiment 3

[0052] Select fresh scallions with no mechanical damage on the surface and no pests to remove the outer skin, wash, and cut into sections with a thickness of 5mm. Place them in 85% ethanol at 25°C and put them in a vacuum with a vacuum degree of 0.6bar. Vacuum treatment in the box for 10 minutes, and then carry out infrared hot air drying at a drying temperature of 60°C and a wind speed of 2m / s, and stop drying when the water content of the scallion white is lower than 7%, to obtain the final scallion ring sample. Determination of rehydration and microbial content of scallions after drying. For the specific detection method, refer to Comparative Example 1.

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Abstract

The invention belongs to the technical field of processing of agricultural products, and particularly discloses an infrared hot air drying method of fistular onion stalks pretreated through union of vacuum and ethanol. The method comprises the following steps of sorting fresh fistular onion stalks of which the surfaces are free from mechanical damage and free from insect pests, removing outer coating, performing cleaning, and performing cutting into segments, to obtain fistular onion stalk rings; performing union of vacuum and ethanol for permeation treatment; and performing infrared hot air drying, and finally, obtaining dehydrated fistular onion stalk products. Compared with infrared hot air drying for fistular onion stalks which are not pretreated, a permeation dehydration technique combining vacuum with ethanol has the advantages that product quality of the infrared hot air drying efficiency, the rehydration properties, the sterilizing effects and the like of the fistular onion stalks are improved, and a new method is provided for industrial production and dry making of fistular onion stalk products. The ethanol is used as a permeation dehydration solution, and compounds on cell walls dissolve, so that the permeability is improved, the permeation dehydration efficiency is improved, the subsequent infrared hot air drying rate can be increased, the ethanol also has the effectof sterilization, and environmental pollution caused by conventional sterilization can be solved.

Description

technical field [0001] The invention relates to the technical field of agricultural product processing, in particular to a scallion white infrared hot air drying method using vacuum combined with ethanol pretreatment. Background technique [0002] Green onions are not only an indispensable condiment in daily life, but also an important vegetable for my country's export earnings. Scallions are rich in nutrition. In addition to vitamins and other substances, they are also rich in allium, which has the effect of sterilizing and inhibiting the growth of microorganisms. Eating raw scallions can also prevent and treat influenza. It can also effectively prevent gastric cancer and various cancers . Infrared hot air drying is a new type of combined drying method, which combines the advantages of infrared and hot air drying to obtain higher quality products and a faster and more convenient drying process. Further research and development of fruit and vegetable pretreatment methods, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23B7/022
CPCA23B7/022A23V2002/00A23V2250/082A23V2300/10
Inventor 周存山孙艳辉王旭乐贲宗友刘淑兰孙啸詹歌
Owner CHUZHOU UNIV
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