Method for purifying hydroxyl-containing pigments
A purification method and pigment technology, applied in chemical instruments and methods, azo dyes, organic dyes, etc., can solve the problems of high cost, a large amount of organic solvents, and limited applications, and achieve low cost, simple process, and high purity of pigments Effect
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Embodiment 1
[0025] (1) The corn starch emulsion with a mass percent concentration of 15% was gelatinized at 90° C. for 40 min, and then subjected to high-pressure treatment to obtain starch paste. The hydroxyl-containing monascus red pigment is dissolved in water so that the concentration of the aqueous solution of the hydroxyl-containing monascus red pigment is 0.01 mg / mL, and the amount of the hydroxyl-containing monascus red pigment is 5% of the dry cornstarch mass. The aqueous solution containing hydroxy monascus red pigment is mixed with starch paste, and then aged at 0°C for 24 hours to obtain colloidal retrograded starch containing monascus red pigment; the temperature of the high-pressure treatment is 110°C, and the time of high-pressure treatment is 20min; heat the obtained colloidal retrograded starch containing monascus red pigment in a water bath at a temperature of 85°C, and add 4% of the amount of starch with high-temperature amylase (with an activity of 200,000 U / ml) for enz...
Embodiment 2
[0030] (2) The sweet potato starch emulsion with a mass percent concentration of 25% was gelatinized at 95° C. for 40 min, and then subjected to high-pressure treatment to obtain starch paste. The hydroxyl-containing monascus red pigment is dissolved in water so that the concentration of the aqueous solution containing the hydroxyl-containing monascus red pigment is 0.5 mg / mL, and the amount of the hydroxyl-containing monascus red pigment is 10% of the dry sweet potato starch mass. The aqueous solution containing hydroxy monascus red pigment is mixed with starch paste, and then aged at 4°C for 48h to obtain gelatinous retrograded starch containing monascus red pigment; the temperature of the high-pressure treatment is 120°C, and the time of high-pressure treatment is 40min; the obtained colloidal retrograded starch containing monascus red pigment was placed in a water bath with a temperature of 95°C and heated, and 4% of the amount of starch was added with high-temperature amyl...
Embodiment 3
[0035] (1) The potato starch emulsion with a mass percent concentration of 20% was gelatinized at 90° C. for 40 min, and then subjected to high-pressure treatment to obtain starch paste. The hydroxyl-containing monascus red pigment is dissolved in water so that the concentration of the aqueous solution containing the hydroxyl-containing monascus red pigment is 0.1 mg / mL, and the amount of the hydroxyl-containing monascus red pigment is 9% of the dry potato starch mass. The aqueous solution containing hydroxy monascus red pigment is mixed with starch paste, and then aged at 2°C for 36h to obtain colloidal retrograded starch containing monascus red pigment; the temperature of the high-pressure treatment is 115°C, and the time of high-pressure treatment is 30min; the obtained colloidal retrograded starch containing monascus red pigment was placed in a water bath with a temperature of 88°C and heated, and 5% of the amount of starch was added with high-temperature amylase (with an a...
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