A kind of extraction method of purple sweet potato anthocyanin

A purple sweet potato anthocyanin and extraction method technology, applied in the direction of organic chemistry and the like, can solve the problems of difficult extraction operation, high extraction cost, low extraction rate, etc., achieve great operability, reduce the difficulty of technological operation, and improve extraction. rate effect

Inactive Publication Date: 2019-05-14
UNIV OF JINAN
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the extraction methods of anthocyanins include solvent method, carbon dioxide supercritical extraction method, ultrasonic method, biological compound enzyme method, etc. These methods generally have the disadvantages of low extraction rate, difficult extraction operation or high extraction cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Extraction steps:

[0029] S1. Preparation of purple sweet potato powder

[0030] Slice the purple sweet potato, dry and pulverize it together with the purple sweet potato skin to obtain purple sweet potato powder with a particle size of 170 mesh;

[0031] S2. Extraction and impurity removal

[0032] Purple sweet potato powder was beaten with liquid nitrogen at -5°C to obtain purple sweet potato slurry, and the concentration was 0.2g / L zinc sulfate aqueous solution, 1-ethyl-3-methylimidazole acetate and 1-ethyl-3-methylimidazole diethyl imidazole phosphate, and mix evenly, purple sweet potato slurry, zinc sulfate aqueous solution, 1-ethyl-3-methylimidazole acetate and 1-ethyl-3-methylimidazole diethyl phosphate The weight ratio is 1:0.9:1.5:1;

[0033] With 200W ultrasonic wave and 350W microwave, after synergistic effect at 25-30°C for 8 minutes, continue microwave extraction for 10 minutes;

[0034] Decolorize and remove impurities by activated carbon, then add a ...

Embodiment 2

[0042] The extraction steps are basically the same as in Example 1, except that the metal salt added in step S2 is 0.2 g / L magnesium chloride aqueous solution.

[0043] After testing, the extraction rate of the product was 76.9%, and the purity was 55.1%.

Embodiment 3

[0045] The extraction steps are basically the same as in Example 1, except that the metal salt added in step S2 is 0.2 g / L copper sulfate aqueous solution.

[0046] After testing, the extraction rate of the product was 75.7%, and the purity was 53.6%.

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Abstract

The invention relates to the field of compound extraction and in particular relates to an extraction method of purple sweet potato anthocyanin. The extraction method is characterized by comprising thefollowing steps: a, adding a metal salt solution, 1-ethyl-3-methylimidazole acetate and 1-ethyl-3-methylimidazole diethyl phosphate into purple sweet potato slurry, and uniformly mixing; carrying outultrasonic and microwave cooperative treatment for 5 to 10 min; then carrying out microwave extraction for 5 to 15 min; carrying out de-coloring and clarificationimpurity removal on an extracting solution, and taking supernatant; concentrating and drying the supernatant to obtain extract; b, carrying out centrifugal separation on the extract and collecting filtrate; concentrating and drying the filtrate to obtain purple sweet potato anthocyanin extract. Compared with the prior art, the extraction method of the purple sweet potato anthocyanin has the advantages of simple technology and convenience for operation; the prepared anthocyanin has the characteristics of high extraction rate, high purity and the like and has very good popularization and application value.

Description

technical field [0001] The invention relates to the field of compound extraction, in particular to a method for extracting purple sweet potato anthocyanins. Background technique [0002] Anthocyanidin, also known as anthocyanin, is a water-soluble pigment that can change color with the acidity and alkalinity of the cell fluid. The cell fluid is acidic and reddish, and the cytosol is alkaline and blue. It is one of the main pigments that make up the color of petals and fruits. Anthocyanin pigments widely exist in a variety of deep red, purple or blue vegetables and fruits, such as black wolfberry, grapes, blackberries, figs, cherries, beetroot, eggplant, purple sweet potato, etc., anthocyanins mainly in natural conditions Existing in the form of glycosides, it is called anthocyanin (Anthocyanin), which was proposed by Marguart when he named the blue extract from cornflower flowers, and is now used as a general term for similar substances. [0003] Anthocyanins may be one of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D311/62
CPCC07D311/62
Inventor 齐学袖
Owner UNIV OF JINAN
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