Method for purifying high-content cochineal red pigment
A carmine, high-content technology, applied in the field of natural pigment purification, can solve the problems of low product purity and difficulty in meeting the demand for high-quality pigments, so as to achieve less allergic reactions, readily available and cheap raw materials, and simple and easy process Effect
Examples
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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Description
Claims
Application Information
- IPC
- C09B61/00; C09B67/54
- CPC
- C09B61/00; C09B67/0096
- Inventors
- 刘锡建