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Method for drying red dates

A technology for drying and jujube, which is applied in the direction of heating and preserving fruits/vegetables, and preserving fruits/vegetables through radiation/electrical treatment, etc., which can solve the problems of unseen research reports, achieve good quality, reduce the loss of nutrients, and shorten the drying time Effect

Inactive Publication Date: 2014-08-06
NORTHWEST A & F UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The combination of ultrasonic pretreatment and medium-short-wave infrared drying of jujube can improve the drying efficiency and quality of jujube, but there is no related research report

Method used

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  • Method for drying red dates

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0030] Preparation of the sample to be tested: Take 20g jujube sample and add 80mL distilled water for beating, take 10g of slurry in a 100mL volumetric flask, constant volume, boil water bath for 30min, after cooling, take 10mL into a 100mL volumetric flask, add 5mL of 6mol / L HCl solution, and boil for 30min , cooled, neutralized with 1mol / L NaOH solution, constant volume, and filtered.

[0031] Determination of the sample to be tested: Take 1mL in a 25mL test tube, add water to 2mL, add DNS reagent 1.5mL, bathe in boiling water for 5min, cool in running water, constant volume, measure the absorbance value at 510nm.

[0032] Calculate according to the following formula:

[0033] Total sugar (%) = (reducing sugar after hydrolysis × dilution factor / sample) × 0.9 × 100%

[0034] (5) Determination of total phenol content: Folin phenol colorimetric method

[0035] (6) Determination method of soluble solids: Determination of soluble solids content according to the national stan...

Embodiment 1

[0044] The steps of drying jujube with medium and short wave infrared after ultrasonic pretreatment: raw material sorting, raw material classification, ultrasonic pretreatment, medium and short wave infrared drying, product classification, packaging, the specific methods are as follows:

[0045] (1) Sorting

[0046] After harvesting, remove branches, leaves and impurities, and sort out diseases, insects, pulp, mildew, rat-bitten rotten jujubes, injured jujubes, cracked skins, yellow skins, and defective jujubes.

[0047] (2) Grading

[0048] The fresh jujube is divided into first grade, second grade and third grade. The sensory rating indicators are shown in Table 2 below.

[0049] Table 2 Grading standards of jujube

[0050] grade level one Secondary Level three Number of grains Within 80 capsules / 500g Within 100 capsules / 500g Within 120 capsules / 500g fruit shape The fruit shape is full and has the characteristics that this product should ...

Embodiment 2

[0069] The steps of drying jujube with medium and short wave infrared after ultrasonic pretreatment: raw material sorting, raw material classification, ultrasonic pretreatment, medium and short wave infrared drying, product classification, packaging, the specific methods are as follows:

[0070] (1) Sorting

[0071] After harvesting, remove branches, leaves and impurities, and sort out diseases, insects, pulp, mildew, rat-bitten rotten jujubes, injured jujubes, cracked skins, yellow skins, and defective jujubes.

[0072] (2) Grading

[0073] The fresh jujube is divided into first grade, second grade and third grade. The sensory rating indicators are shown in Table 5 below.

[0074] Table 5 Grading standards of jujube

[0075] Number of grains Within 80 capsules / 500g Within 100 capsules / 500g Within 120 capsules / 500g Number of grains Within 80 capsules / 500g Within 100 capsules / 500g Within 120 capsules / 500g fruit shape The fruit shape is full ...

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Abstract

The invention discloses a method for drying red dates. The method comprises the following step of performing medium short wave infrared drying on the red dates after ultrasonic preprocessing, wherein the ultrasonic preprocessing conditions are as follows: the ultrasonic frequency is 25-59 kHz, the ultrasonic time is 20-60 min, and the ultrasonic power is 300-450 W; the medium short wave infrared drying conditions are as follows: the wavelength is 1-4 microns, the infrared lamp power is 450-2,025 W, the temperature is 40-60 DEG C, and the time is 9-15 hours. According to the method, the red date drying time is effectively shortened, the loss of nutritional ingredients in the red dates in a drying process is reduced, the color and the flavor of the original fruit are maximally remained, and the red dates are clean and natural, safe and sanitary. The ultrasonic preprocessing step and the medium short wave infrared drying step are serially combined, so that the method is easy to operate, and beneficial to popularize and use.

Description

technical field [0001] The invention belongs to the field of food processing and relates to a method for drying red dates. Background technique [0002] Red date (jujube) is the mature fruit of jujube tree of the genus Jujube in Rhamnaceae. It is a nutritious fruit with the same source of medicine and food. It has high edible value and medicinal value. Compounds, polysaccharides, organic acids, etc. [0003] In "Shen Nong's Materia Medica", there are records that jujube advocates "anzhong nourishes the spleen" and "replenishes less qi and less body fluid"; the ancient text "Changsha Yaojie" records: "Red dates can nourish the essence of Taiyin and transform the qi of yang and yin. , nourishing the lungs and removing dryness, nourishing the blood and nourishing the liver and quenching the wind, treating the weakening of the spleen and stomach, and regulating the deficiency of the meridians. The red dates nourish the soil, nourish the blood to transform qi, and nourish the li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23B7/01A23B7/015
Inventor 徐怀德陈文敏任亚梅罗安伟寇莉萍
Owner NORTHWEST A & F UNIV
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