Method for extracting refined cottonseed brown pigment from cottonseed hulls

A technology of cottonseed hulls and brown pigments, applied in chemical instruments and methods, azo dyes, organic dyes, etc., can solve the problems of low extraction rate of alkaline extraction, large investment in equipment for ultrasonic extraction, and high cost of repeated solvent extraction. Achieve low solvent and acid-base costs, reduce extraction costs, and achieve good product quality

Active Publication Date: 2011-12-14
邯郸晨光植物蛋白有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the cost of repeated solvent extraction is high, the extraction rate of alkaline extraction is low, and the equipment investment of ultrasonic extraction is large, and it has not yet been industrialized.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Take 100 kilograms of dry cottonseed hulls and grind them to 30-40 meshes, add 600 kilograms of ethyl acetate, filter and add 600 kilograms of alkali alcohol aqueous solution (a solution with a mass fraction of KOH of 0.5% and a weight concentration of ethanol of 30%) to the cottonseed hulls ), heated to 45°C and soaked for 2 hours, and released the solution; then added 600 kg of the above-mentioned alkali alcohol aqueous solution to the cottonseed hulls, soaked at 45°C for 2 hours, and released the aqueous solution again; then added 600 kg of the above-mentioned alkali alcohol aqueous solutions to the cottonseed hulls again, Soak at 45°C for 1 hour and release the solution. The obtained aqueous solutions were combined, cooled and centrifuged to remove mechanical impurities; the pH value of the supernatant was adjusted to 2.0 with hydrochloric acid, concentrated and spray-dried to obtain 3.25 kg of cottonseed brown pigment with a color value of 23.5.

Embodiment 2

[0020] Take 100 kilograms of dried cottonseed hulls and grind them to 30-40 meshes, add 600 kilograms of ethyl acetate, filter and add 600 kilograms of alkali alcohol aqueous solution (a solution with a mass fraction of NaOH of 0.5% and a weight concentration of ethanol of 30%) in the cottonseed hulls ), heated to 50°C and soaked for 2 hours, and released the solution; then added the above-mentioned alkali alcohol aqueous solution to the cottonseed hull, soaked at 50°C for 2 hours, and released the aqueous solution again; then added 600 kg of the above-mentioned alkali alcohol aqueous solution to the cottonseed hull again, Soak for 1 hour, release the solution; combine the obtained aqueous solutions, and centrifuge to remove mechanical impurities after cooling; adjust the pH value of the supernatant to 2.0 with hydrochloric acid, concentrate and spray dry to obtain 3.18 kg of cottonseed brown pigment with a color value of 24.2 .

Embodiment 3

[0022] Take 100 kilograms of dried cottonseed hulls and grind them to 30-40 meshes, add 300 kilograms of ethyl acetate, filter and add 450 kilograms of alkali alcohol aqueous solution (a solution with a mass fraction of NaOH of 1.0% and a weight concentration of methanol of 40%) to the cottonseed hulls ), heated to 55°C and soaked for 2 hours, and released the solution; then added the above-mentioned alkali alcohol aqueous solution to the cottonseed hulls, soaked at 55°C for 2 hours, and released the aqueous solution again; combined the obtained aqueous solutions, cooled and centrifuged to remove mechanical impurities; After the pH value of the supernatant was adjusted to 3.0, it was concentrated and spray-dried to obtain 3.19 kg of cottonseed brown pigment with a color value of 23.8.

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Abstract

The invention discloses a method for extracting and purifying cottonseed brown pigment from cottonseed hulls. The method comprises the following steps: (1) grinding the dried cottonseed hulls to 30-40 meshes; (2) soaking the ground cottonseed hulls in ethyl acetate for 1-3 hours, filtering the solution and removing the filtrate; (3) after removing the filtrate, extracting the cottonseed brown pigment from the cottonseed hulls with alkali-alcohol aqueous solution at the temperature of 35-55 DEG C and centrifuging the water extract to remove the impurities; and (4) adjusting the pH value of thesupernatant obtained through centrifugation to 2-3 with acid and then carrying out concentration and drying, thus obtaining the cottonseed brown pigment. The equipment used in the method is simple and the costs of the solvent and the acid and alkali are lower, thus reducing the extraction cost of the cottonseed brown pigment, and meanwhile, the environmental pollution is reduced, the operation safety is improved and the method is suitable for industrialized production.

Description

technical field [0001] The invention relates to an industrial method for purifying natural extracts, in particular to a method for extracting refined cottonseed brown pigment from cottonseed hulls. Background technique [0002] With the development of modern industry, the demand for natural pigments continues to increase. Natural pigments are safe, non-toxic, simple in color, and contain a large number of ingredients that are beneficial to human health. Therefore, the use of natural substances to extract food pigments has become a new development in the world today. trend, and its development has become a major research hotspot. [0003] Studies have found that cottonseed contains a variety of ingredients, and cottonseed hull pigment is one of the important components in cottonseed hulls. It is brown in color and is called cottonseed brown. It can be used as additives, pigments, and dyes for beverages, food, feed, and chemical industries. [0004] At present, the techniques...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B61/00
Inventor 卢庆国连运河程远欣丁红梅
Owner 邯郸晨光植物蛋白有限公司
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