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A method for purifying cochineal red pigment with high content

A cochineal, high-content technology, which is applied in the field of natural pigment purification, can solve the problems of low product purity, difficulty in meeting high-quality pigment requirements, etc., and achieves less allergic reaction, readily available and cheap raw materials, and simple and easy process. Effect

Active Publication Date: 2021-03-26
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the purity of the product obtained by the above-mentioned patented technology is not high, and it is difficult to meet the market's demand for high-quality pigments

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This embodiment provides a method for purifying a high-purity cochineal red pigment, the method comprising the following steps:

[0031] (1) Preparation of cochineal red pigment extract: take 50 g of dried cochineal, add 300 mL of 50 vol% ethanol solution, heat, extract at 60° C. for 1 hour, filter, and recover the filter residue. The filter residue was extracted twice again by the above method, and the above filtrates were combined and concentrated by a rotary evaporator to obtain a concentrated solution for future use.

[0032] (2) Soak the polyamide resin in water, take 100mL polyamide resin, and pack it into a column by wet method.

[0033] (3) Adjust the concentrated cochineal red pigment solution obtained above to a pH value of 2.8, let it rest for 24 hours, filter, and take the filtrate for later use.

[0034] (4) Take 4 times the resin volume of the concentrated cochineal red pigment, and pass it through the resin column at 2 times the resin volume / h.

[0035]...

Embodiment 2

[0040] A method for purifying a high-purity carmine pigment, the method comprising the following steps:

[0041] (1) Add the dried cochineal into the ethanol solution, the mass ratio of the dried cochineal or filter residue to the ethanol solution is 1:3, the concentration of the ethanol solution is 80vol%, extract at 50°C for 2h, filter, and recover the filter residue , adding the filter residue to ethanol solution to extract twice, and combining all the filtrates to obtain the cochineal red pigment extract;

[0042](2) concentrating the carmine extract, adjusting the pH value to 2.5, standing for 6 hours, and filtering, and the obtained filtrate is the cochineal concentrate;

[0043] (3) Soak the polyamide resin in water, take 100mL of polyamide resin, use the wet method to pack the column, and absorb the carmine concentrated solution through the polyamide resin. The adsorption condition is: the volume of the carmine concentrated solution 1 times the resin volume, the upper...

Embodiment 3

[0048] A method for purifying a high-purity carmine pigment, the method comprising the following steps:

[0049] (1) Add the dried cochineal into the ethanol solution, the mass ratio of the dried cochineal or filter residue to the ethanol solution is 1:5, the concentration of the ethanol solution is 50vol%, extract at 68°C for 1.5h, filter and recover filter residue, add the filter residue to ethanol solution and extract twice, and combine all the filtrates to obtain the cochineal red pigment extract;

[0050] (2) concentrating the cochineal pigment extract, adjusting the pH value to 3, standing for 24 hours, and filtering, and the obtained filtrate is the cochineal pigment concentrated solution;

[0051] (3) Soak the polyamide resin in water, take 100mL of polyamide resin, use the wet method to pack the column, and absorb the carmine concentrated solution through the polyamide resin. The adsorption condition is: the volume of the carmine concentrated solution 4 times the vol...

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PUM

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Abstract

The invention relates to a method for purifying high-content cochineal pigment. The method comprises the following steps: (1) preparing a cochineal pigment extracting solution; (2) concentrating and filtering the cochineal pigment extracting solution to obtain a cochineal pigment concentrated solution; (3) adsorbing the cochineal pigment concentrated solution through polyamide resin to obtain resin adsorbed with cochineal pigment; (4) washing the polyamide resin adsorbed with the cochineal pigment with deionized water; (5) eluting the polyamide resin adsorbed with the cochineal pigment by adopting a solvent, and collecting eluent; and (6) concentrating the eluent, and carrying out spray drying to obtain the cochineal pigment. Compared with the prior art, the method has the advantages thatthe process is simple and feasible, the polyamide resin can be used for multiple times, the method is environment-friendly and energy-saving, the raw materials are easy to obtain and low in price, andthe obtained cochineal pigment is low in protein content and does not easily cause anaphylactic reaction.

Description

technical field [0001] The invention belongs to the field of natural pigment purification, and relates to a method for purifying natural pigment extracts, in particular to a method for purifying high-content carmine pigment. Background technique [0002] Carmine is an anthraquinone natural pigment extracted from cochineal insects. Its hue is pink to purple. It is an excellent colorant for food, cosmetics, medicine and textiles. It is also the only FDA-approved food. It can also be used as a natural pigment for medicines and cosmetics [Food Science and Technology, 2012 (9): 266-270; Ion Exchange and Adsorption (1): 82-89]. Carmine can also be used in the treatment of AIDS, cancer, etc. [Ayuko W O.EP0499467.1992-08-19.]. [0003] my country's carmine is mainly imported from Peru, and the domestic carmine industry is still in its infancy, and there are not many studies on the industrial separation and preparation of carmine. The cochineal pigment that has only been initially ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09B61/00C09B67/54
CPCC09B61/00C09B67/0096
Inventor 刘锡建
Owner SHANGHAI UNIV OF ENG SCI
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