Technology for extracting pigments from grape peels

A technology of grape skin pigment and extraction process, applied in the field of extraction of natural pigments, can solve the problems of increased extraction cost, increased cost of post-solvent, low economic applicability, etc., and achieves uniform extraction effect, good appearance and color, and good water solubility. Effect

Inactive Publication Date: 2016-02-10
周子童
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional extraction of pigments with ethanol as a solvent has its advantages, but there are also many disadvantages. The yield of pigments is very low, which is easy to cause waste, and the recovery of the post-solvent also increases the cost, and the economic applicability is low; Zhou Wenwen reported The extraction time of the optimized process is longer, which also increases the cost of extraction to a certain extent

Method used

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  • Technology for extracting pigments from grape peels

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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 grap...

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Abstract

The invention discloses a technology for extracting pigments from grape peels. The technology comprises the following steps: (1) mixing dry grape peel powder with ethanol (95%), adjusting the pH value to 2-4 by a critic acid water solution, carrying out high speed pretreatment at a room temperature, performing homogenous extraction, and filtering; (2) after filtration, mixing the filter residues with ethanol (95%), adjusting the pH value to 2-4 by a critic acid water solution, carrying out homogenous extraction again, and filtering; (3) subjecting the filtrate to centrifugation, collecting the supernate, and freeze-drying the supernate to obtain powder namely the grape peel pigment; wherein the high speed pretreatment lasts for at least 5 minutes under a rotation speed of 5000 to 10000 r / min, and the homogenous extraction lasts for at least 10 minutes under a rotation speed of 1000 to 4000 r / min. The invention also discloses a grape peel pigment obtained by the provided method. The provided technology is simple, the equipment requirement is low, the extraction efficiency is high, the extraction time is largely shortened, and thus the technology is obviously better than the conventional solvent extraction method. The obtained grape peel pigment has the advantages of high water solubility, good color and appearance, and stable properties, and is suitable for being used as food additive and healthcare product.

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): C09B61/00C09B67/54
Inventor 周子童
Owner 周子童
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