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Method for extracting sorghum red pigment

A technology of sorghum red pigment and an extraction method, which is applied in the field of extraction of natural pigments, can solve problems such as harm to human body, complicated extraction process, easily induced poisoning, etc., and achieves the effects of strong tinting strength, simple extraction process and natural color and luster.

Inactive Publication Date: 2012-09-19
杨青松
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are two types of food coloring: natural and synthetic. Natural food coloring is directly extracted from animal and plant tissues and is harmless to the human body. Synthetic food coloring is made from aniline dyes separated from coal tar. , these synthetic pigments are easy to induce poisoning, diarrhea and even cancer, and are harmful to the human body, so they should not be used more or should not be used as much as possible.
Sorghum red pigment is one of the natural pigments, the existing extraction process of sorghum red pigment is complicated and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Wash 1000 grams of sorghum husks with water, dry and pulverize them, add them to a reactor with a stirrer, add 2000 milliliters of ethanol with a concentration of 60% under constant stirring, and then add hydrochloric acid with a concentration of 5% to adjust the pH of the reaction solution When the value is 1, heat up to 80°C and keep warm for 2 hours to extract; after the reaction, let it stand for 20 minutes, filter off the residue, adjust the filtrate to neutrality with 15% sodium hydroxide solution, and add the filtrate to the still In the process, the red crude product was obtained after recovering ethanol by distillation under reduced pressure; adding ethyl acetate of twice the amount of the crude product, stirring for half an hour, so that the salt in the crude product was dissolved in ethyl acetate, performing vacuum distillation, and recovering the ethyl acetate. Get brownish red sorghum red pigment finished product:

Embodiment 2

[0016] Wash 1500 grams of sorghum husks with water, dry and crush them, add them to a reactor with a stirrer, add 3000 milliliters of ethanol with a concentration of 60% under constant stirring, and then add hydrochloric acid with a concentration of 8% to adjust the pH of the reaction solution The value is 1, heat up to 85°C, and extract after 2.5 hours of heat preservation; after the reaction, let it stand for 25 minutes, filter off the residue, adjust the filtrate to neutrality with 12% sodium hydroxide solution, and add the filtrate to the still In the process, the red crude product was obtained after recovering ethanol by distillation under reduced pressure; adding ethyl acetate of twice the amount of the crude product, stirring for half an hour, so that the salt in the crude product was dissolved in ethyl acetate, performing vacuum distillation, and recovering the ethyl acetate. The finished brown-red sorghum red pigment is obtained;

Embodiment 3

[0018] Wash 2000 grams of sorghum husks with water, dry and pulverize them, add them to a reactor with a stirrer, add 4000 milliliters of ethanol with a concentration of 60% under constant stirring, and then add hydrochloric acid with a concentration of 10% to adjust the pH of the reaction solution When the value is 1, heat up to 90°C and keep warm for 3 hours to extract; after the reaction, let it stand for 30 minutes, filter off the residue, adjust the filtrate to neutrality with 15% sodium hydroxide solution, and add the filtrate to the still In the process, the red crude product was obtained after recovering ethanol by distillation under reduced pressure; adding ethyl acetate of twice the amount of the crude product, stirring for half an hour, so that the salt in the crude product was dissolved in ethyl acetate, performing vacuum distillation, and recovering the ethyl acetate. The finished brown-red sorghum red pigment is obtained.

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Abstract

The invention discloses a method for extracting a sorghum red pigment. The sorghum red pigment is a main color generation substance in sorghum husks and belongs to flavone compounds. The sorghum husks serve as a main raw material, ethanol serves as an extracting agent, hydrochloric acid serves as a pH value regulator, sodium hydroxide serves as a neutralizer and ethyl acetate serves as an extracting solvent. The sorghum red pigment comprises the following steps of washing, drying, extracting and distilling under reduced pressure. The process is simple and convenient to operate; and the prepared sorghum red pigment has natural color and luster and strong coloring power, and is widely applied to the food and beverage industries.

Description

technical field [0001] The invention relates to a method for extracting natural pigment, in particular to a method for extracting sorghum red pigment. Background technique [0002] Food coloring is a kind of pigment, which is a food additive that changes the original color of food to a certain extent. There are two types of food coloring: natural and synthetic. Natural food coloring is directly extracted from animal and plant tissues and is harmless to the human body. Synthetic food coloring is made from aniline dyes separated from coal tar. , These synthetic pigments are easy to induce poisoning, diarrhea and even cancer, and are harmful to the human body, so they should not be used more or should not be used as much as possible. Sorghum red pigment is a kind of natural pigment, and the extraction process of existing sorghum red pigment is complicated and the cost is high. Contents of the invention [0003] Purpose of the invention: In order to solve the deficiencies of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B61/00A23L1/275
Inventor 杨青松
Owner 杨青松
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