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Extracting and purifying method of red-brown pigment of chestnut shells

A purification method, chestnut shell technology, applied in chemical instruments and methods, azo dyes, organic dyes, etc., can solve the problems of easy formation of melanin, pigment insoluble in water, dark color, etc., to improve purity and water solubility, solve Effects of environmental pollution and expansion of application fields

Active Publication Date: 2014-02-12
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] When the existing extraction and purification methods are used to extract the brown-red pigment from chestnut shells, most of the lignin is precipitated together with the pigment during the purification process, resulting in the obtained pigment being insoluble in water, dark in color, and easily forming melanin, which limits its use. Applications in industries such as food, cosmetics and biopharmaceuticals
In addition, acid precipitation purification requires high acid resistance of equipment, and the main purification reagents used are toxic, which seriously endangers the health of extraction and purification process workers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The embodiment of the present invention provides a method for extracting and purifying brown-red pigment from chestnut shell, the method comprising:

[0033] Step 1: Crushing chestnut shells to form granular raw materials;

[0034] The smaller the particle size of the raw material, the larger its contact area with the extract, which is conducive to improving the extraction efficiency; but when the particle size of the raw material is small to a certain extent, it is easy to agglomerate, which is not conducive to full contact with the extract, so When the particle size of the granular raw material is 20-40 mesh, it can not only ensure the full contact between the granular raw material and the extraction solution, but also avoid agglomeration, which is beneficial to improve the extraction efficiency.

[0035] Step 2: immerse the granular raw material in an aqueous ethanol solution with a relatively low concentration, and extract by microwave-assisted extraction to obtain ...

Embodiment 2

[0049] 70g chestnut shells are pulverized to form 20-40 mesh granular raw materials;

[0050] Add 1.4L of 25% ethanol aqueous solution to the microwave reactor, immerse the granular raw material into the ethanol aqueous solution in the microwave reactor, and stir and extract at about 70°C for about 30min. The specific heating curve is as follows: temperature from 25 The temperature rises from 50°C to 50°C at a heating rate of 10°C / min, the temperature rises from 50°C to 70°C at a heating rate of 5°C / min, and is maintained at 70°C for 23.5 minutes. After the extraction is completed, the initial pigment extract is obtained; Fully extract, repeat the above steps twice, combine the initial extracts three times, and concentrate by rotary evaporation at -0.098MPa vacuum until the solution does not hang on the wall, pour it out, and freeze-dry at -50°C to obtain crude pigment powder;

[0051] The crude pigment powder obtained in the above steps is dissolved in 50mL of 25% ethanol aqu...

Embodiment 3

[0056] 70g chestnut shells are pulverized to form 20-40 mesh granular raw materials;

[0057] Add 1.4L of 50% ethanol aqueous solution into the microwave reactor, immerse the granular raw material into the ethanol aqueous solution in the microwave reactor, stir and extract at about 70°C for about 30min, the specific heating curve is set as follows: temperature from 25 The temperature rises from 50°C to 50°C at a heating rate of 10°C / min, the temperature rises from 50°C to 70°C at a heating rate of 5°C / min, and is maintained at 70°C for 23.5 minutes. After the extraction is completed, the initial pigment extract is obtained; Fully extract, repeat the above steps twice, combine the initial extracts three times, and concentrate by rotary evaporation at -0.098MPa vacuum until the solution does not hang on the wall, pour it out, and freeze-dry at -50°C to obtain crude pigment powder;

[0058] The crude pigment powder obtained in the above steps is dissolved in 50mL of 50% ethanol a...

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Abstract

The invention discloses an extracting and purifying method of a red-brown pigment of chestnut shells, and belongs to the technical field of plant extraction separation and purification. The extracting and purifying method comprises the steps: crushing the chestnut shells to form granular raw materials; soaking the granular raw materials in an alcohol water solution with low concentration, extracting by adopting a microwave-assisted extraction method to obtain a primary pigment extract; preparing a primary pigment solution with concentration which is close to or equal to a saturated concentration from the primary pigment extract; mixing the primary pigment solution with the alcohol water solution with the volume which is 2-4 times that of the primary pigment solution, settling, filtering, concentrating to obtain a pigment concentrated solution; mixing the pigment concentrated solution with deionized water with the volume which is 9-11 times that of the primary pigment solution, settling, filtering, and drying to obtain pigment powder. The extracting and purifying method provided by the invention solves the problem of extraction and purification of the red-brown pigment of the chestnut shells; used reagents are nontoxic and pollution-free; the application field of the pigment of the chestnut shells is widened.

Description

technical field [0001] The invention belongs to the technical field of plant extraction, separation and purification, and in particular relates to a method for extracting and purifying brown-red pigment from chestnut shells. Background technique [0002] With the improvement of living standards, people's awareness of food safety has gradually increased. Natural pigments are extracted from animals, plants and microorganisms. They are widely used in food, cosmetics and medicine because of their high safety, bright and attractive colors, a large number of beneficial ingredients to the human body, and certain nutritional value and pharmacological health effects. in the industry. [0003] In terms of sources, natural pigments can be divided into plant pigments, animal pigments and microbial pigments. Among them, plant pigments have been extensively researched and developed due to their numerous sources of raw materials. Studies have shown that plant pigments mostly exist in th...

Claims

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Application Information

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IPC IPC(8): C09B61/00
Inventor 许凤游婷婷张利鸣孙唐胜
Owner BEIJING FORESTRY UNIVERSITY
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