Preparation method of purple sweet potato pigment

A purple sweet potato pigment and pigment technology, which is applied in the field of natural plant pigment preparation, can solve the problems of large amount of organic solvent, easy structure degradation, low yield, etc., and achieve the effect of bright color, fine texture and high purity of the finished product

Inactive Publication Date: 2021-03-05
HUNAN TIANXIANG BIOTECHNOLOGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there are problems such as low yield, low purity, large amount of organic

Method used

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  • Preparation method of purple sweet potato pigment
  • Preparation method of purple sweet potato pigment
  • Preparation method of purple sweet potato pigment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] ① Cleaning and cutting into strips: Soak the purple sweet potato, wash away the attached soil, pathogenic bacteria and residual pesticides with running tap water, dry until there are no visible water droplets on the surface, and cut into thin strips of about 1cm×1cm×3cm.

[0035] ②Crude extraction: add 2% glacial acetic acid to the water to prepare the extractant, the extraction temperature is 40°C, the ratio of solid to liquid is 1:4 (g / mL), and the extraction time is 1h. And collect the pigment crude extract.

[0036] ③ Freezing and thawing: put the roughly extracted purple potato strips into a plastic bag and place them in a -20°C freezer for 1 hour, then take them out and thaw them at room temperature, and then add an extractant with a solid-to-liquid ratio of 1:2 (g / mL) ( The extractant prepared in step ②), repeated freeze-thaw extraction twice, combined step ② and the pigment crude extract obtained after the two freeze-thaws.

[0037] ④ Filtration and concentrati...

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Abstract

The invention discloses a preparation method of a purple sweet potato pigment. The method comprises the following steps: performing cleaning, airing and cutting. taking an acetic acid aqueous solutionas an extracting agent, carrying out crude extraction according to a solid-liquid ratio of 1: 4, carrying out freeze thawing treatment on the purple sweet potato strips twice, combining pigment crudeextracts, and carrying out vacuum concentration to obtain a pigment concentrated solution; treating the pigment concentrated solution with a graphene oxide dispersion solution, carrying out primary purification, and carrying out centrifugal separation to obtain supernatant; pre-treating and packing adsorption macroporous resin SP70 into a column, and injecting a supernate pigment liquid into a resin layer, wherein the sample loading flow rate is 3.0-3.5 BV/h; washing the resin layer after adsorption saturation with 2BV clear water, wherein an eluent is prepared from 70% ethanol and 0.5% acetic acid, the elution flow rate is 2.0-2.5 BV/h, and the elution volume is 5BV; and collecting eluate, and performing vacuum concentrating and freeze-drying to obtain a purple sweet potato anthocyanin pigment dry product. According to the method, an alcohol solvent is not used, the pigment extraction rate is increased through freeze thawing treatment, impurities such as proteins are removed throughthe adsorption effect of graphene oxide in the purification process, the anthocyanin complexing effect is avoided, the purification effect is improved, and the high-purity purple sweet potato anthocyanin pigment is obtained.

Description

technical field [0001] The invention relates to a method for preparing natural plant pigments, in particular to a method for preparing high-purity purple potato pigments. Background technique [0002] Pigment is an important additive in food processing, and most of the currently used food colorings are chemically synthesized. With people's attention to health and the progress of modern toxicology research, the toxicity, mutagenesis, teratogenicity, carcinogenicity and side effects of children's behavioral allergies of synthetic pigments have attracted attention, and the use of synthetic pigments has been increasingly restricted. It has become a trend that natural pigments gradually replace synthetic pigments. It is of great significance to seek new plant pigment resources and study the efficient green extraction and preparation technology of natural pigments. [0003] Anthocyanin is an important class of plant pigments with bright color, wide sources and certain physiologi...

Claims

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Application Information

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IPC IPC(8): C09B61/00C07H17/065C07H1/08
CPCC09B61/00C07H17/065C07H1/08
Inventor 黄名勇邓洁红呙亚波王娟慧
Owner HUNAN TIANXIANG BIOTECHNOLOGY CO LTD
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