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Extraction method of red pigment in purple sweet potato

An extraction process, purple sweet potato technology, applied in the direction of azo dyes, organic dyes, chemical instruments and methods, etc., can solve the problems of large solvent consumption, long extraction time, low extraction amount, etc., and achieve short extraction time and high extraction effect Uniform, high extraction efficiency

Inactive Publication Date: 2017-05-24
CHONGQING DOUHAO BIOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to overcome the shortcomings of the traditional method for extracting purple sweet potato red pigment, such as long extraction time, large solvent consumption, low extraction amount, and high cost, thereby providing a new method for extracting purple sweet potato red pigment. The method improves the traditional alcohol extraction method, increases the extraction yield of purple sweet potato red pigment without increasing the extraction cost, shortens the extraction time, reduces the amount of solvent used, and lays a foundation for expanding the industrial application value of purple sweet potato red pigment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Wash and grind fresh purple sweet potato, weigh 100 grams of the above purple sweet potato slurry, and set aside.

[0033] 2) Add 95wt% ethanol (purple sweet potato slurry: 95wt% ethanol = 1g: 5mL), adjust the pH value to 2.0 with 0.1 mol / L citric acid solution, and pretreat at 10,000 rpm for 5 minutes at room temperature , and then homogeneously extracted at 3000 rpm for 30 minutes and then filtered.

[0034] 3) Collect the filtrate, add 95wt% ethanol to the filter residue (filter residue: 95wt% ethanol = 1g: 5mL), and adjust the pH value to 2.0 with 0.1 mol / L citric acid solution, and homogenize at room temperature at 3000 rpm Filter after 30 minutes of extraction.

[0035] 4) Combine the two filtrates, centrifuge at 1000 rpm for 10 minutes at room temperature to remove the precipitate, collect the supernatant and freeze-dry it into powder to obtain purple sweet potato red pigment.

Embodiment 2

[0037] 1) Wash and grind fresh purple sweet potato, weigh 100 grams of the above purple sweet potato slurry, and set aside.

[0038] 2) Add 95wt% ethanol (purple sweet potato slurry: 95wt% ethanol = 1g: 7mL), adjust the pH value to 3.0 with 0.1 mol / L citric acid solution, and pretreat at 10000 rpm for 10 minutes at room temperature , and then homogeneously extracted at 3000 rpm for 20 minutes and then filtered.

[0039] 3) Collect the filtrate, add 95wt% ethanol to the filter residue (filter residue: 95wt% ethanol = 1g: 7mL), adjust the pH value to 3.0 with 0.1 mol / L citric acid solution, and extract homogeneously at room temperature at 3000 rpm Filter after 20 minutes.

[0040] 4) Combine the two filtrates, centrifuge at 1000 rpm for 15 minutes at room temperature to remove the precipitate, collect the supernatant and freeze-dry it into powder to obtain purple sweet potato red pigment.

Embodiment 3

[0042] 1) Wash and grind fresh purple sweet potato, weigh 100 grams of the above purple sweet potato slurry, and set aside.

[0043] 2) Add 95wt% ethanol (purple sweet potato slurry: 95wt% ethanol = 1g: 10mL), adjust the pH value to 4.0 with 0.1 mol / L citric acid solution, and pretreat at room temperature at 10,000 rpm for 10 minutes , and then homogeneously extracted at 3000 rpm for 10 minutes and then filtered.

[0044] 3) Collect the filtrate, add 95wt% ethanol to the filter residue (filter residue: 95wt% ethanol = 1g: 10mL), adjust the pH value to 4.0 with 0.1 mol / L citric acid solution, and extract homogeneously at room temperature at 3000 rpm Filter after 10 minutes.

[0045] 4) Combine the two filtrates, centrifuge at 1000 rpm for 15 minutes at room temperature to remove the precipitate, collect the supernatant and freeze-dry it into powder to obtain purple sweet potato red pigment.

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PUM

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Abstract

the invention discloses an extraction method of a red pigment in purple sweet potato. The extraction method comprises following steps: 1, purple sweet potato pulp is mixed with 95wt% ethanol, pH value is adjusted to 2 to 4 with a citric acid aqueous solution, high speed pretreatment is carried out at room temperature, homogenizing extraction is carried out, and filtering is carried out; 2, an obtained filter residue is mixed with 95wt% ethanol, pH value is adjusted to 2 to 4 with the citric acid aqueous solution, and homogenizing extraction and filtering are carried out; 3, an obtained filtrate is subjected to centrifugation, an obtained supernatant is collected, and is subjected to freeze drying so as to obtain a powder which is the red pigment in purple sweet potato. The extraction method is simple; requirement on production equipment is low; extraction efficiency is high; extraction time is shortened greatly; the extraction method is obviously better than a conventional solvent extraction method; the water solubility of the red pigment in purple sweet potato is high, appearance color is excellent, performance is stable, and the red pigment is suitable to be taken as a food additive and a health care food raw material.

Description

technical field [0001] The invention belongs to the technical field of natural pigment extraction, and in particular relates to an extraction process of purple sweet potato red pigment. Background technique [0002] The food processing and production industry needs a large amount of food coloring to enhance the competitiveness of products and is an important sensory indicator of food. However, most of the food coloring used in the food industry is artificially synthesized chemical coloring. Many aniline pigments are produced from coal tar as raw material, most of which are harmful to human body. In the past 20 years, it has been found that the toxic effects of chemically synthesized pigments are not only general toxicity and diarrhea, but also carcinogenic in some varieties. Many varieties of synthetic pigments have been banned one after another, and the remaining varieties are also strictly restricted in dosage and scope of use. Especially after the artificially synthesize...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B61/00
Inventor 罗雪文其他发明人请求不公开姓名
Owner CHONGQING DOUHAO BIOTECH
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