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Chestnut shell pigment grading method

A technology of chestnut shell pigment and grading method, which is applied in the direction of chemical instruments and methods, azo dyes, organic dyes, etc., can solve the problems of limiting the application range of pigments, and achieve the effects of low cost, expanded application range, and simple process

Inactive Publication Date: 2012-10-31
SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these two invention patents have strong innovation and important application value and commercial prospects, there are also some shortcomings, such as: the chestnut shell pigment extracted or produced according to the methods provided by these two patents is in alkali It can be completely dissolved in neutral and neutral water, but only partially dissolved in acidic water and ethanol, which limits the application range of the pigment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 500g chestnut shells are pulverized into 3 ~ 5mm in particle size, sieved, and after removing floc by sieving, it is dropped into an extraction tank, extracted with 6L sodium hydroxide aqueous solution with a concentration of 0.03% by weight, and extracted The temperature was 85° C., and the time was 3 hours. The filtrate obtained by filtration was further classified according to the following steps:

[0020] (1) Adjust the pH value of the filtrate to 2 with 4mol / L hydrochloric acid. Let it stand for 12 hours to fully precipitate the acid-insoluble pigments.

[0021] (2) Separate the pigment precipitate and pigment solution with a centrifugal force of 10000 g, and collect the precipitate and solution separately.

[0022] (3) The obtained pigment solution is passed through an adsorption column equipped with XAD-8 macroporous resin, and the pigment contained in it is adsorbed on the resin, and then rinsed and adsorbed with deionized water of pH 2 (adjusted with HCl) with...

Embodiment 2

[0028]500g chestnut shells are pulverized into particle diameter 3 ~ 5mm, sieved, after adopting sieve to remove floc, it is dropped in the leaching tank, with the 6L sodium carbonate solution leaching of 0.05% concentration by weight, the leaching temperature At 75°C for 3 hours, the filtrate obtained by filtration was further classified according to the following steps:

[0029] (1) Adjust the pH value of the filtrate to 3 with 0.5mol / L hydrochloric acid. Let it stand for 12 hours to fully precipitate the acid-insoluble pigments.

[0030] (2) Separate the pigment precipitate and pigment solution with a centrifugal force of 10000g, and collect the precipitate and solution separately.

[0031] (3) The obtained pigment solution passes through the adsorption column equipped with XAD-8 macroporous resin, and the pigment contained in it is adsorbed on the resin, and then the adsorption column is washed with deionized water with a pH of 2 times the volume of the column bed, and th...

Embodiment 3

[0037] Crush 500g of chestnut shells to a particle size of 3 ~ 5mm, sieve, remove the flocs by sieving, put it into the extraction tank, and use 6L sodium hydroxide ethanol solution with a concentration of 0.03% by weight (with 50% Preparation of ethanol aqueous solution) leaching, the leaching temperature is 65°C, the time is 8 hours, and the filtrate obtained by filtration is further classified according to the following steps:

[0038] (1) Adjust the pH value of the filtrate to 2 with 1mol / L nitric acid. Let it stand for 12 hours to fully precipitate the acid-insoluble pigments.

[0039] (2) Separate the pigment precipitate and pigment solution with a centrifugal force of 10000g, and collect the precipitate and solution separately.

[0040] (3) The resulting pigment solution was diluted with an equal volume of deionized water and then passed through an adsorption column equipped with XAD-8 macroporous resin. Rinse the adsorption column with water, then rinse the adsorptio...

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Abstract

The invention relates to a production and processing technology of natural edible pigment in food additives, and specifically relates to a chestnut shell natural brown pigment grading method. According to the invention, a chestnut shell pigment crude extract is subjected to processes such as acidification precipitation, hydrophilic organic solvent extraction, and macroporous resin adsorption, such that the chestnut shell pigment is graded into three components with different solubility. The component I is soluble in hydrophilic organic solvents, and alkaline, neutral and acidic solutions; the component I is soluble in alkaline solutions and hydrophilic organic solvents; and the component III is only soluble in alkaline solutions. In an application procedure, an appropriate chestnut shell pigment graded component can be selected according to specific conditions. Therefore, the application range of chestnut shell pigments is expanded. The method provided by the invention is safe, non-toxic, and is advantaged in low production cost, simple process, and suitability for industrialized productions.

Description

technical field [0001] The invention relates to a production and processing technology of natural edible pigment, in particular to a method for grading chestnut shell pigment. Background technique [0002] Color is one of the important factors that constitute the sensory quality of food. The color of food can not only make people appetite, but also an important sensory index to distinguish the quality of food, and it also affects people's perception of flavor. Therefore, maintaining or imparting good color to food is an important issue in the food industry. Chemically synthesized food colorings are bright in color and have good stability. However, in recent years, people have paid more and more attention to the safety of synthetic colorings. The amount of synthetic colorings used as food additives has become less and less, and their use has even been banned. However, natural pigments have no toxic and side effects, and have a certain health-care and therapeutic effect on t...

Claims

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Application Information

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IPC IPC(8): C09B61/00C09B67/54
Inventor 姚增玉王力华杨柏珍
Owner SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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