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Method for extracting pigment from walnut green hulls through subcritical water and using pigment for dyeing

A technology of walnut green husk and extraction solution, which is applied in dyeing methods, chemical instruments and methods, natural dyes, etc., can solve the problems of cumbersome extraction steps, and achieve the effects of high extraction efficiency, reduced pollution, and safe process

Inactive Publication Date: 2015-12-09
XINJIANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to make full use of resources and overcome the need to use organic solvents in the extraction process of the prior art, and the extraction steps are cumbersome, the present invention provides a method of extracting polyphenols, flavonoids, anthraquinones and naphthalene from waste walnut green husks using subcritical water as an extraction solvent A method for natural pigments of walnut green husks such as quinones, which is environmentally friendly, safe and non-toxic to humans and the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The walnut green skin raw material is crushed, passed through a 80-mesh sieve, accurately weighed 0.5000g, put it into a 25mL hydrothermal reaction kettle, added 15mL distilled water, sealed it, and placed it in an oven heated to 150°C for extraction for 50min. After the extraction, the reaction kettle was taken out from the oven, placed in cold water to rapidly cool to room temperature, filtered with suction, and the residue was washed with a small amount of distilled water, the volume of the extract was adjusted to 25mL, and the content was determined. After analysis, the total extraction rate of total polyphenols, flavonoids, anthraquinones and naphthoquinones from walnut green bark was 13.8%.

Embodiment 2

[0034] The walnut green skin raw material is crushed, passed through a 80-mesh sieve, accurately weighed 3.0000g, put it into a 100mL hydrothermal reaction kettle, added 50mL of distilled water, sealed it, and placed it in an oven heated to 180°C for extraction for 60 minutes. After the extraction, the reaction kettle was taken out from the oven, placed in cold water to rapidly cool down to room temperature, filtered with suction, and the residue was washed with a small amount of distilled water, the volume of the extract was adjusted to 100mL, and the content was determined. After analysis, the total extraction rate of polyphenols, flavonoids, anthraquinones and naphthoquinones in walnut green husk was 16.5%.

Embodiment 3

[0036] Grind walnut green husk raw materials, accurately weigh 100.00g and put it into a 5000mL autoclave, add 2500mL of boiled deionized water, stir to ensure that the sample is completely soaked in water, seal it, heat the system to 200 °C quickly, start timing, and extract 60min. After the extraction is finished, the heat exchange system is quickly fed with cooling water for rapid cooling, the extract is taken out from the reaction kettle, filtered, the filter residue is washed with a small amount of deionized water, and the content thereof is determined. After analysis, the total extraction rate of polyphenols, flavonoids, anthraquinones and naphthoquinones in walnut green bark was 16.1%.

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Abstract

The invention relates to a method for extracting natural pigment from walnut green hulls and using the natural pigment for dyeing and belongs to the field of natural product extraction and application. According to the method, subcritical water serves as an extraction solvent, polyphenol, flavone, anthraquinone, naphthoquinone and other natural pigment in the walnut green hulls are extracted, and a natural pigment extraction solution is directly used for dyeing cotton and wool fabric. The method has the advantages that the active ingredient extraction rate is high, no organic solvent is used in the extracting and dyeing process, the process is environmentally friendly, and products are free of pollution, safe, free of toxicity and the like. No toxic and harmful pigment ingredient is contained in dyed fabric obtained through the method, and the method is suitable for dyeing the various cotton and wool fabric and particularly suitable for dyeing infant articles for use, underwear and other articles due to the fact that the natural pigment of the walnut green hulls further has anti-bacterium activity, anti-oxidation activity and the like.

Description

technical field [0001] The invention relates to a method for extracting natural pigments from walnut green husks by using subcritical water and using them for dyeing cotton and wool fabrics, and belongs to the field of extraction and application of natural plant active ingredients. More specifically, the present invention relates to a method for extracting natural active ingredients such as polyphenols, flavonoids, anthraquinones and naphthoquinones in walnut green peels as natural pigments under subcritical conditions using green walnut peels as raw materials and water as an extraction solvent. And a method for dyeing cotton yarn or cotton fabric, wool, rabbit hair or its wool fabric with the extracted walnut green husk natural pigment extract. The process of the method is green, no organic solvent is used, the extraction rate of walnut green peel pigment is high, the dyeing process is safe, pollution-free and non-toxic, and the dyed fabric can be used for various purposes, e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06P1/34D06P1/44D06P3/60D06P3/14D06P3/04C09B61/00C09B67/54
Inventor 刘玉梅丁芸刘奎钫刘玉英
Owner XINJIANG UNIVERSITY
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