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Natural pigment extraction technology

An extraction process, a technology of natural pigments, applied in the field of pigment preparation technology, can solve the problems of high cost and low extraction rate, and achieve the effects of increased yield, high extraction efficiency, and good water solubility

Inactive Publication Date: 2016-01-27
周子童
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a kind of natural Pigment extraction method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Take fresh chestnut shells, wash them with water, dry them, crush them, pass them through a 100-mesh sieve, and set them aside.

[0030] 2) Weigh 100 grams of chestnut shell powder, add ethanol with a volume fraction of 95%, and adjust the pH value to 2.0 with 0.1 mole per liter of hydrochloric acid, and the mass volume fraction of the solid-liquid ratio is 1:5.

[0031] 3) At room temperature, high-speed pretreatment at 10,000 rpm for 10 minutes, followed by homogeneous extraction at 3,000 rpm for 30 minutes, followed by filtration.

[0032] 4) Homogenously extract the filter residue in the above step 3) at 3000 rpm for another 5 hours, and filter.

[0033] 5) Combine the two filtrates, neutralize with 0.1 mole per liter of sodium hydroxide solution, centrifuge at 1000 rpm for 10 minutes, remove the precipitate, collect the supernatant, concentrate, freeze-dry to powder, and obtain the chestnut shell pigment 6.32 grams (brown color), pigment extraction rate 96.5%. ...

Embodiment 2

[0035] 1) Take fresh chestnut shells, wash them with water, dry them, crush them, pass them through a 100-mesh sieve, and set them aside.

[0036] 2) Weigh 100 grams of chestnut shell powder, add ethanol with a volume fraction of 95%, and adjust the pH value to 3.0 with 0.1 mole per liter of hydrochloric acid, and the mass volume fraction of the solid-liquid ratio is 1:10.

[0037] 3) At room temperature, high-speed pretreatment at 10,000 rpm for 20 minutes, followed by homogeneous extraction at 4,000 rpm for 60 minutes, followed by filtration.

[0038] 4) Extract the filter residue in the above step 3) homogeneously for another 7 hours at 3000 rpm, and filter.

[0039] 5) Combine the two filtrates, neutralize with 0.1 mole per liter of sodium hydroxide solution, centrifuge at 1000 rpm for 15 minutes, remove the precipitate, collect the supernatant, concentrate, freeze-dry to powder, and obtain the chestnut shell pigment 6.67 grams, the color is brown, and the pigment extract...

Embodiment 3

[0041] 1) Take fresh chestnut shells, wash them with water, dry them, crush them, pass them through a 100-mesh sieve, and set them aside.

[0042] 2) Weigh 100 grams of chestnut shell powder, add ethanol with a volume fraction of 95%, and adjust the pH value to 4.0 with 0.1 mole per liter of hydrochloric acid, and the mass volume fraction of the solid-liquid ratio is 1:7.

[0043] 3) At room temperature, high-speed pretreatment at 9000 rpm for 5 minutes, then homogeneous extraction at 4000 rpm for 45 minutes and then filtration.

[0044] 4) Extract the filter residue in the above step 3) homogeneously for 8 hours at 3000 rpm, and filter.

[0045] 5) The two filtrates were combined, neutralized with 0.1 mol per liter of sodium hydroxide, centrifuged at 1000 rpm for 5 minutes to remove the precipitate, concentrated after collecting the supernatant, freeze-dried into powder, and obtained 6.15 grams of chestnut shell pigment (The color is brown), and the pigment extraction rate i...

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Abstract

The present invention discloses a natural pigment extraction technology comprising the following steps: (1) a raw material is washed with water, dried, crushed and sieved through a 100 mesh sieve, and homogeneously extracted in a solution mixture of an ethanol aqueous solution of 60-90% by volume and a hydrochloric acid aqueous solution of 0.1 mol / l, pH of the solution mixture of is from 2.0 to 5.0, and the filtrate is obtained by filtration after the extraction; the homogeneous extraction comprises a high speed preprocessing stage and homogenization extraction stage; (2) supernatant is obtained by neutralization and centrifugal slag removal of the filtrate obtained by the step (1); and (3) the natural pigment can be extracted by concentration and drying of the supernatant obtained by the step (2), and the raw material comprises chestnut shell, black bean hull, dragon fruit peel and the like. The extraction method is simple in process, low in demand for production equipment, and higher in extraction rate, and pigment substances are not easy to destroy.

Description

technical field [0001] The invention relates to a method for extracting natural pigments, in particular to a process for preparing pigments such as chestnut shell pigments, acorn shell pigments and hazelnut shells. Background technique [0002] Natural plant pigments can be divided into four categories according to different chemical structures, pyrrole derivative pigments, polyene pigments (carotenoids), phenolic pigments, ketone and quinone pigments, which are not only non-toxic and harmless, but also Many contain essential nutrients for the human body or are vitamins or substances with vitamin properties, such as riboflavin, lycopene, β-carotene, etc. At the same time, the natural color tone is relatively natural, which can better imitate the color of natural products. There are many factors such as the relatively natural color tone, so the choice of pigments in the modern food industry tends to use natural pigments, and the extraction of natural pigments also plays an im...

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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