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Grape-skin pigment and extraction process for same

A grape skin pigment and extraction process technology, which is applied in the field of natural pigment extraction, can solve the problems of long extraction time, increased extraction cost, low economic applicability, etc. in the optimized process, and achieves uniform extraction effect, thorough extraction and good water solubility. Effect

Inactive Publication Date: 2013-06-19
SHANGHAI LAMP BIOLOGICAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The traditional extraction of pigments with ethanol as a solvent has its advantages, but there are also many disadvantages. For example, the extraction process reported by Li Yanping, but the yield of pigments is very low; The recovery of solvent also increases a certain cost, and the economic applicability is low; the optimized process reported by Zhou Wenwen has a long extraction time, which also increases the extraction cost to a certain extent

Method used

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  • Grape-skin pigment and extraction process for same
  • Grape-skin pigment and extraction process for same
  • Grape-skin pigment and extraction process for same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1) Take the fresh skin, wash it with water, dry it to constant weight, and finally crush it through a 100-mesh sieve to make grape skin powder. Weigh 100 grams of the above grape skin powder and set aside.

[0037] 2) Add 95wt% ethanol (grape skin powder: 95wt% ethanol = 1g: 5mL), and adjust the pH value to 2.0 with 0.1 mol / liter citric acid solution, and pretreat at room temperature for 5 minutes at a high speed of 10000 rpm, Then, extract homogeneously at 3000 rpm for 30 minutes and then filter.

[0038] 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 / liter citric acid solution, and homogenize at room temperature at 3000 rpm Filter after 30 minutes of extraction.

[0039] 4) Combine the two filtrates, centrifuge at 1000 rpm for 10 minutes at room temperature, remove the precipitate, collect the supernatant and freeze-dry it into a powder to obtain 3.26 grams of gra...

Embodiment 2

[0041] 1) Take fresh skin, wash it with water, dry it to constant weight, crush it through a 100-mesh sieve to make grape skin powder, weigh 100 grams of the above grape skin powder, and set aside.

[0042] 2) Add 95wt% ethanol (grape skin powder: 95wt% ethanol = 1g: 7mL), and adjust the pH value to 3.0 with 0.1 mol / liter citric acid solution, and pretreat at room temperature for 10 minutes at a high speed of 10000 rpm, Then, extract homogeneously at 3000 rpm for 20 minutes and then filter.

[0043] 3) Collect the filtrate, add 95wt% ethanol to the filter residue (filter residue: 95wt% ethanol = 1g: 7mL), and 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.

[0044] 4) Combine the two filtrates, centrifuge at 1000 rpm for 15 minutes at room temperature, remove the precipitate, collect the supernatant and freeze-dry it into a powder to obtain 3.35 grams of grape skin pigment, colo...

Embodiment 3

[0046]1) Take fresh skin, wash it with water, dry it to constant weight, crush it through a 100-mesh sieve to make grape skin powder, weigh 100 grams of the above grape skin powder, and set aside.

[0047] 2) Add 95wt% ethanol (grape skin powder: 95wt% ethanol = 1g: 10mL), and adjust the pH value to 4.0 with 0.1 mol / liter citric acid solution, and pretreat at room temperature for 10 minutes at a high speed of 10000 rpm, Then, extract homogeneously at 3000 rpm for 10 minutes and then filter.

[0048] 3) Collect the filtrate, add 95wt% ethanol to the filter residue (filter residue: 95wt% ethanol = 1g: 10mL), and adjust the pH value to 4.0 with 0.1 mol / L citric acid solution, and extract homogeneously at 3000 rpm at room temperature Filter after 10 minutes.

[0049] 4) The two filtrates were combined, and centrifuged at 1000 rpm for 15 minutes at room temperature to remove the precipitate. After collecting the supernatant, freeze-dried into a powder to obtain 3.31 grams of grape...

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Abstract

The invention discloses an extraction process for grape-skin pigment. The extraction process for grape-skin pigment comprises the following steps of: (1) mixing dried grape-skin powder with 95 wt% ethanol, adjusting the pH value to 2-4 by citric acid aqueous solution, performing high-speed pre-treatment and homogeneous extraction at a room temperature, and filtering; (2) mixing the filter residue obtained after filtering with 95 wt% ethanol, adjusting the pH value to 2-4 by citric acid aqueous solution, performing homogeneous extraction again, and filtering; and (3) centrifuging the filtrate, collecting the supernatant, freeze-drying the supernatant into a powder, namely, the grape-skin pigment, wherein the high-speed pre-treatment is performed for more than 5 minutes at a speed of 5000-10000 r / min; and the homogeneous extraction is performed for more than 10 minutes at a speed of 1000-4000 r / min. The invention further discloses the grape-skin pigment prepared by the process. The extraction process disclosed by the invention is simple, low in requirements on production equipment, high in extraction efficiency, greatly shortened in extraction time, and obviously superior to the traditional solvent extraction method. The obtained grape-skin pigment is good in water solubility, good in appearance colour, stable in character, and suitable for use as a food additive or a healthcare food raw material.

Description

technical field [0001] The invention belongs to the technical field of extraction of natural pigments, and in particular relates to a grape skin pigment and an extraction process thereof. Background technique [0002] my country's grape brewing industry produces a large amount of grape pomace every year, and at 20-25% of the skin, at least hundreds of thousands of tons of pomace are produced every year. These dregs are mainly used in feed and fertilizer industries, resulting in very low added value, and a considerable part of them is not utilized and pollutes the environment. [0003] Studies have found that grape pomace contains more natural pigments, the content of which is generally above 3.7% (mass fraction), and its red pigment content is more than 300mg / 100g, and it is rich in anthocyanins. It is not only bright in color, It is excellent in dyeing and can be widely used in jams, acidic drinks and fruit wines. Compared with synthetic pigments, it has certain nutritiona...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B61/00
Inventor 刘国庆赵肖胡卫华钱晓勇
Owner SHANGHAI LAMP BIOLOGICAL SCI & TECH
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