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Chestnut shell natural brown pigment extraction method

An extraction method and a technique for chestnut shell, which are applied in the field of extraction of natural brown pigment from chestnut shell, can solve the problems of difficult popularization of industrial production, complicated process and high cost, and achieve the effects of low cost, simple process and good light resistance.

Inactive Publication Date: 2005-01-26
SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Existing literature pays more attention to the research of Chinese chestnut shell pigment performance and extraction technology aspect, has not been promoted in the large-scale industrialized production, and its shortcoming is: 1) in order to improve yield, extractant mostly adopts industrial or Strong base for analysis requires follow-up treatment; 2) When the unrefined crude extract is dried and dissolved in water, a small amount of insoluble matter appears, and its color value is low; 3) Some of the refinements are carried out by (resin) adsorption method, The process is complicated, the cost is high, and it is difficult to popularize in industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1) Soak the crushed chestnut shell powder with 5 times of 0.05% sodium carbonate solution to make it fully wet, then place it in a water bath at 85°C and heat it for 1.2 hours before filtering; the filter residue is extracted with 8 times of sodium carbonate solution , combine the two extracts, then dry and grind to obtain the crude extract of chestnut shell brown pigment, the yield is 10%; the color value before refining is 10.

[0017] 2) On the basis of the finished product extracted with alkaline solution, the aqueous solution of ethanol is used for refining, specifically, the extraction filtrate is concentrated to a small volume and then 2.5 times (95%) of ethanol is added. The volume concentration of ethanol is 67.8%, and there is a precipitate Precipitate, stand still for 2 hours, filter, and dry the filtered precipitate directly to obtain the refined product of pigment I; recover ethanol from the filtrate, evaporate the aqueous solution to dryness or spray dry, o...

Embodiment 2

[0020] 1) Soak the crushed chestnut shell powder with 10 times of 0.08% sodium bicarbonate solution to make it fully wet, then place it in a water bath at 95°C and heat it for 3 hours before filtering; then use 5 times of the sodium bicarbonate solution to filter the residue Leaching, combining the two extracts, drying and grinding to obtain the crude brown pigment of chestnut shell, the yield is 6%; the color value before refining is 10.

[0021] 2) On the basis of the finished product extracted with alkaline solution, the aqueous solution of ethanol is used for refining, specifically, after the extraction filtrate is concentrated to a small volume, 3 times the amount (95%) of ethanol is added. The volume concentration of ethanol is 71.3%, and there is a precipitate Precipitate, stand still for 3 hours, filter, and the filtered precipitate is directly dried or dissolved in water and spray-dried to obtain the refined product of pigment I; ethanol is recovered from the filtrate,...

Embodiment 3

[0024] 1) Soak the crushed chestnut shell powder with 6 times of 0.05% sodium hydroxide solution to make it fully wet, then place it in a water bath at 90°C and heat it for 2.5 hours before filtering; filter the residue with 5 times of sodium hydroxide solution Leaching, combining the two extracts, drying and grinding to obtain the crude brown pigment of chestnut shell with a yield of 12%; the color value before refining is 10.

[0025] 2) On the basis of the finished product extracted with alkaline solution, the aqueous solution of ethanol is used for refining, specifically, after the extraction filtrate is concentrated to a small volume, 3 times the amount (95%) of ethanol is added. The volume concentration of ethanol is 71.3%, and there is a precipitate Precipitate, stand still for 2.5 hours, filter, and the filtered precipitate is directly dried or dissolved in water and spray-dried to obtain the refined product of pigment I; ethanol is recovered from the filtrate, and the ...

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Abstract

The invention relates to Chestnut shell natural brown pigment extraction method, which consists of refining the crude extract of chestnut shell brown pigment with aqueous solution of ethanol, stewing, filtering, drying the precipitate directly or by water spraying, thus obtaining refined pigment I product, recovering ethanol from the filtrate, evaporating the aqueous solution to dryness or spray drying, thus obtaining refined pigment II product.

Description

technical field [0001] The invention relates to natural food pigments in food additives, in particular to a method for extracting natural brown pigments from chestnut shells. Background technique [0002] Food coloring agent is one of the important ingredients in processed food, it includes two parts: synthetic food coloring and natural food coloring. Although chemically synthesized food pigments are bright in color and good in stability, most synthetic food pigments are harmful to human health, and some have carcinogenic effects. Therefore, the amount of synthetic pigments used as food additives is decreasing, and even banned; They are all actively working on the research and development of plant natural pigments. As food additives, natural pigments are favored by people because of their non-toxic and side effects, certain health and therapeutic effects on the human body, and low cost. Therefore, finding and developing natural food coloring resources without toxic and side...

Claims

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Application Information

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IPC IPC(8): C09B61/00
Inventor 王力华杨柏珍韩桂云许思明李琳
Owner SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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