Preparation method of pucker-free non-cleaning dried jujubes

A technology for washing and drying red dates, which is applied in the direction of preserving fruits/vegetables through dehydration, which can solve the problems of loss of nutrients, darkening of the surface of red dates, shrinkage of jujube skin, etc., and achieve improved sensory quality, bright color, and loose jujube fruit Effect

Active Publication Date: 2014-06-11
交城天娇红农业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention overcomes the deficiencies of the prior art, and the technical problems to be solved are the skin shrinkage of jujube during the drying process, the darkening of the surface color of the jujube and the loss of nutritional components caused by excessive drying temperature.

Method used

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  • Preparation method of pucker-free non-cleaning dried jujubes
  • Preparation method of pucker-free non-cleaning dried jujubes
  • Preparation method of pucker-free non-cleaning dried jujubes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A method for preparing wrinkle-free and non-washing dried jujube, comprising the following steps:

[0047] a. Selection of red dates: select and grade red dates, classify high-quality red dates according to variety, size, and maturity, and use red dates with the same variety, size, and maturity as the same grade;

[0048] b. Cleaning of jujubes: the jujubes of the same level are cleaned in three steps, that is, after bubbling surf cleaning, brush cleaning, and pure water spray cleaning, the water on the surface of the jujubes is blown dry by an air knife;

[0049] c. Pre-dry the washed jujubes of the same level with cold air for 5 hours, adjust the moisture content of the jujubes, and keep the moisture evenly until the moisture content is 35%-36.5%;

[0050] d. Microwave vacuum drying of red dates: spread the pre-dried red dates of the same level evenly in the tray of the microwave vacuum dryer, exhaust the air first, and then carry out microwave vacuum drying after the...

Embodiment 2

[0053] A method for preparing wrinkle-free and non-washing dried jujube, comprising the following steps:

[0054] a. Selection of red dates: select and grade red dates, classify high-quality red dates according to variety, size, and maturity, and use red dates with the same variety, size, and maturity as the same grade;

[0055] b. Cleaning of jujubes: the jujubes of the same level are cleaned in three steps, that is, after bubbling surf cleaning, brush cleaning, and pure water spray cleaning, the water on the surface of the jujubes is blown dry by an air knife;

[0056] c. Pre-dry the washed jujubes of the same level with cold air for 3 hours, adjust the moisture content of the jujubes, and keep the moisture evenly until the moisture content is 36.6%-37.8%;

[0057] d. Microwave vacuum drying of red dates: spread the same level of pre-dried red dates with the same moisture content in the tray of the microwave vacuum dryer evenly, and exhaust the air first. After decompression...

Embodiment 3

[0060] A method for preparing wrinkle-free and non-washing dried jujube, comprising the following steps:

[0061] a. Selection of red dates: select and grade red dates, classify high-quality red dates according to variety, size, and maturity, and use red dates with the same variety, size, and maturity as the same grade;

[0062] b. Cleaning of jujubes: the jujubes of the same level are cleaned in three steps, that is, after bubbling surf cleaning, brush cleaning, and pure water spray cleaning, the water on the surface of the jujubes is blown dry by an air knife;

[0063] c. Pre-dry the washed jujubes of the same level with cold air for 4 hours, adjust the moisture of the jujubes, and keep the moisture evenly until the moisture content is 35.3%-36.7%;

[0064] d. Microwave vacuum drying of red dates: spread the same level of pre-dried red dates with the same moisture content in the tray of the microwave vacuum dryer evenly, and exhaust the air first. After decompression to the ...

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Abstract

The invention discloses a preparation method of pucker-free non-cleaning dried jujubes, belongs to the technical field of food drying processing, and relates to a method of carrying out microwave vacuum puffing drying on red dates, aiming at solving the technical problems that jujube skin pucker, surface color darkening, nutritional ingredient loss, and the like appearing in a drying process of the red dates. According to the adopted technical scheme, the preparation method of the pucker-free non-cleaning dried jujubes comprises the following steps: pickling jujubes, grading the jujubes, rejecting defective fruits and impurities in materials; cleaning jujubes; drying water on the surfaces of the red dates by an air knife after cleaning the red dates; pre-drying for 3 hours-6 hours by cold air, regulating moisture of the red dates, and keeping the moisture of the red dates uniform, so that moisture content of the red dates reaches 35%-38%; carrying out microwave vacuum puffing drying on the red dates; spreading materials which are pre-dried by the cold air in a tray of a microwave vacuum unit, exhausting and then reducing pressure, wherein the conditions for carrying out the microwave vacuum puffing drying are as follows: vacuum degree is 65kPa-75kPa, microwave power is 6W/g-10W/g, drying time is 5 minutes-10 minutes, and final moisture content is controlled at 20%-25%.

Description

technical field [0001] The invention discloses a method for preparing wrinkle-free and non-washing dried dates, which belongs to the technical field of food drying and processing, and in particular relates to a method for drying and removing wrinkles of red dates by using a microwave vacuum puffing method. Background technique [0002] Red jujube (zizyphus jujubadates) has another name called Chinese jujube, is Rhamnaceae (Rhamnaceae) jujube plant, the fruit of jujube tree. In China, it is mainly distributed in Shaanxi, Shanxi, Hebei, Shandong, Henan and other provinces in the north; a small amount is distributed in Sichuan, Hubei, Anhui, Zhejiang and other provinces in the south. Modern scientific research shows that jujube is rich in nutrition and contains a variety of active ingredients: like ginseng, cyclic adenosine monophosphate (cAMP) contained in jujube is an essential substance for energy metabolism in the human body. It can enhance human muscle strength and help th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23B7/02
Inventor 王晓艳康振奎冯俊敏巩晋龙李涛段永利李奠础
Owner 交城天娇红农业科技有限公司
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