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Method for extracting pigment from walnut epicarp

A technology of walnut exocarp and extraction method, which is applied in the extraction of walnut exocarp pigment and in the field of plant extraction of natural pigment industry, which can solve the problems of destroying pigment components and extracting many impurities, and achieve high purity, high concentration efficiency, and easy recovery Effect

Inactive Publication Date: 2009-12-16
XINJIANG AGRI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The existing research on the extraction and purification process of the brown pigment in the exocarp of Xinjiang walnut is not perfect, and most of them are extracted by water extraction or alkaline water reflux, but these methods have many extraction impurities, and alkaline conditions may destroy the pigment components, etc. Therefore, it is necessary to conduct in-depth research on the extraction method of walnut exocarp brown pigment. At present, it is urgent to carry out research on improving the extraction rate of pigment and solving the problem of industrial production of pigment, focusing on economy and practicality, and establishing its optimal extraction process.

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  • Method for extracting pigment from walnut epicarp
  • Method for extracting pigment from walnut epicarp

Examples

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Embodiment 1

[0023] Embodiment one: the extraction process of walnut exocarp pigment

[0024] Reference attached figure 1 50g of the walnut exocarp powder that crossed a 20 mesh sieve was extracted with 8 times of 80% (v / v) ethanol aqueous solution at 25°C for 3 hours and filtered under reduced pressure, and the filter residue was then washed with 4 times of 80% (v / v) The ethanol was extracted twice, each extraction was 40 minutes, the three filtrates were combined, the insoluble impurities were removed by centrifugation, the temperature was controlled at 60°C in a rotary evaporator, and the volume was concentrated to 300ml.

[0025] Add petroleum ether (30°C to 60°C) to 300ml concentrated solution and extract 3 times, the dosage is 200ml, recover the solvent under reduced pressure at 50°C, spray dry at 50°C to obtain 0.1851g of green pigment A, and extract the residue with chloroform for 3 Each time, the dosage is 200ml, the solvent is recovered under reduced pressure at 50°C, and the ye...

Embodiment 2

[0027] Reference attached figure 1 50g of the walnut exocarp powder that crossed a 60 mesh sieve was extracted with 15 times of 50% (v / v) ethanol aqueous solution at 40°C for 2 hours and filtered under reduced pressure, and the filter residue was extracted twice with 8 times of 50% ethanol. Extract for 40 minutes each time, combine three filtrates, centrifuge to remove insoluble impurities, control the temperature in a rotary evaporator at 60°C, and concentrate to a volume of 300ml. Add petroleum ether (60°C-90°C) to the 300ml concentrated solution and extract 3 times, the dosage is 200ml, recover the solvent under reduced pressure at 60°C, evaporate to dryness at 60°C to obtain 0.064g of green pigment A, and extract the residue with chloroform for 3 Each time, the dosage is 200ml, the solvent is recovered under reduced pressure at 60°C, evaporated to dryness at 60°C to obtain 0.06g of yellow-green pigment B, the residue is extracted with ethyl acetate three times, the dosage ...

Embodiment 3

[0029] Reference attached figure 150g of the walnut exocarp powder that crossed the 80 mesh sieve was extracted with 10 times of 30% (v / v) ethanol aqueous solution at 60°C for 1 hour and then filtered under reduced pressure, and the filter residue was then washed with 5 times of 30% (v / v) The ethanol was extracted twice, each extraction was 40 minutes, the three filtrates were combined, the insoluble impurities were removed by centrifugation, the temperature was controlled at 60°C in a rotary evaporator, and the volume was concentrated to 300ml. Add petroleum ether (60°C to 90°C) to the 300ml concentrated solution and extract 3 times, the dosage is 200ml, recover the solvent under reduced pressure at 70°C, dry in vacuum at 70°C to obtain 0.0055g of green pigment A, and extract the residue with chloroform for 3 Each time, the dosage is 200ml, the solvent is recovered under reduced pressure at 70°C, and the yellow-green pigment B is obtained by vacuum drying at 70°C, which is 0....

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Abstract

The invention discloses a method for extracting and purifying natural brown pigment from walnut epicarp. The method comprises the following steps: by using the walnut epicarp as a raw material, extracting the walnut epicarp to obtain crude brown pigment extract with water solution of ethanol, separating and purifying the crude brown pigment with petroleum ether, chloroform, acetic ether and n-butyl alcohol as extracting agents, reducing the pressure and drying each extracting agent to obtain three purified brown pigments with different colors. The method is simple and feasible, has low cost, good product quality and good stability, changes waste walnut epicarp after the walnut is processed into valuable, and develops a new resource and a new path for seeking a new natural brown pigment; and the extracted natural brown pigment is widely applied in the fields of food, cosmetics, textiles and pharmacy.

Description

field of invention [0001] The invention relates to the industrial field of extracting natural pigments from plants. Specifically, the invention relates to the technical field of extracting walnut exocarp pigment. Background technique [0002] Food coloring is a food additive used for food coloring, widely used in food, daily chemical, pharmaceutical and other industries. Commonly used food coloring includes two categories: natural coloring and synthetic coloring. Natural pigments come from natural products, mainly extracted from plant tissues, and also include some pigments from animals and microorganisms. With the development of society and the improvement of people's living standards, more and more people have questioned whether the use of synthetic pigments in food will cause harm to human health. At the same time, a large number of studies have shown that almost all synthetic pigments cannot provide nutrients to the human body, and some synthetic pigments may even end...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23L1/27A23L1/36C09B61/00A23L5/40A23L25/00
Inventor 傅力韩海霞车凤斌包晓玮潘俨
Owner XINJIANG AGRI UNIV
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