Method for improving stability of black rice pigment
A technology of black rice pigment and stability, applied in the field of natural pigments, can solve the problems of easily changing the natural color of black rice pigment, complicated operation of black rice pigment, poor long-term stability effect, etc., and achieves excellent application value and no pollution after post-processing. Environment, not easy to change the effect of fading
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Embodiment 1
[0073] Embodiment 1, prepare black rice pigment product
[0074] Take konjac glucomannan as a natural polysaccharide raw material, add it into 50% ethanol aqueous solution, and prepare a 15wt% konjac glucomannan solution;
[0075] The prepared konjac glucomannan solution is subjected to water bath treatment, the temperature is 40 ° C, the stirring speed is 150 r / min, the treatment is 30 min, then NaOH is added to adjust the pH to 11, and the treatment is further 30 min, and the deacetylated konjac glucomannan is obtained after the reaction is completed. The reaction solution;
[0076] The deacetylated konjac glucomannan reaction solution was repeatedly washed with 60%, 70%, and 90% ethanol aqueous solution to remove excess alkali, to pH 7, suction filtration, and volatilize alcohol (ie ethanol) in a fume hood , freeze-dried to obtain powdered deacetylated konjac glucomannan;
[0077] The deacetylated konjac glucomannan was formulated into a solution of 2 mg / mL;
[0078] The...
Embodiment 2
[0080] Example 2: Preparation of black rice pigment products
[0081] Take konjac glucomannan as a natural polysaccharide raw material, add it into 50% ethanol aqueous solution, and prepare a 15wt% konjac glucomannan solution;
[0082] The prepared konjac glucomannan solution is subjected to water bath treatment, the temperature is 40 ° C, the stirring speed is 150 r / min, the treatment is 30 min, then NaOH is added to adjust the pH to 11, and the treatment is further 30 min, and the deacetylated konjac glucomannan is obtained after the reaction is completed. The reaction solution;
[0083] The deacetylated konjac glucomannan reaction solution was repeatedly washed with 60%, 70%, and 90% ethanol aqueous solution to remove excess alkali, to pH 7, suction filtration, evaporated alcohol in a fume hood, freeze-dried, Obtain powdered deacetylated konjac glucomannan;
[0084] The deacetylated konjac glucomannan was formulated into a solution of 5 mg / mL;
[0085] The black rice pig...
Embodiment 3
[0087] Example 3: Preparation of black rice pigment products
[0088] Take konjac glucomannan as a natural polysaccharide raw material, add it into 50% ethanol aqueous solution, and prepare a 15wt% konjac glucomannan solution;
[0089] The prepared konjac glucomannan solution is subjected to water bath treatment, the temperature is 40 ° C, the stirring speed is 150 r / min, the treatment is 30 min, then NaOH is added to adjust the pH to 11, and the treatment is further 30 min, and the deacetylated konjac glucomannan is obtained after the reaction is completed. The reaction solution;
[0090] The deacetylated konjac glucomannan reaction solution was repeatedly washed with 60%, 70%, and 90% ethanol aqueous solution to remove excess alkali, to pH 7, suction filtration, evaporated alcohol in a fume hood, freeze-dried, Obtain powdered deacetylated konjac glucomannan;
[0091] The deacetylated konjac glucomannan was formulated into a solution of 10 mg / mL;
[0092] The black rice pi...
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