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Extraction method for natural pigment

An extraction method and natural pigment technology, applied in the field of natural pigment extraction, can solve the problems of high cost and low extraction rate, and achieve the effects of increased yield, high extraction efficiency, and simple extraction process

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

[0032] The technical problem to be solved by the present invention is to overcome the defects of high cost and low extraction rate in the existing methods for extracting natural pigments such as chestnut shell pigment, black soybean skin pigment, and pitaya peel pigment, and provide a Extraction method of natural pigment

Method used

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  • Extraction method for natural pigment

Examples

Experimental program
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Effect test

Embodiment 1

[0066] 1) Take fresh chestnut shells, wash them with water, dry them, crush them, pass them through a 100-mesh sieve, and set them aside.

[0067] 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.

[0068] 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.

[0069] 4) Homogenously extract the filter residue in the above step 3) for another 5 hours at 3000 rpm, and filter.

[0070] 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

[0072] 1) Take fresh chestnut shells, wash them with water, dry them, crush them, pass them through a 100-mesh sieve, and set them aside.

[0073] 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.

[0074] 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.

[0075] 4) Extract the filter residue in the above step 3) homogeneously for another 7 hours at 3000 rpm, and filter.

[0076] 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

[0078] 1) Take fresh chestnut shells, wash them with water, dry them, crush them, pass them through a 100-mesh sieve, and set them aside.

[0079] 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.

[0080] 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.

[0081] 4) Extract the filter residue in the above step 3) homogeneously for 8 hours at 3000 rpm, and filter.

[0082] 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 invention discloses an extraction method for a natural pigment. The extraction method for a natural pigment comprises the following steps of: (1) washing, drying and crushing raw materials, then passing through a 100-mesh sieve, performing homogeneous extraction in the mixed solution of ethanol aqueous solution in the percentage of 60-95% by volume and hydrochloric acid aqueous solution in the concentration of 0.1 mole per litre, and filtering after the extraction, so as to obtain a filtrate, wherein the pH value of the obtained mixed solution is 2.0-5.0; and the homogeneous extraction comprises a high-speed pre-treatment phase and a homogeneous extraction phase; (2) neutralizing, centrifuging and deslagging the filtrate obtained in the step (1), so as to obtain a supernatant; and (3) concentrating and drying the supernatant obtained in the step (2), so as to obtain the natural pigment, wherein the raw materials are chestnut shells, black soya bean skins, dragon fruit peels, lychee exocarps, grape seeds, hickory exocarps, acorn shells, orange peels, hazelnut shells, nectarine peels and purple sweet potato or purple-black broomcorn shells. The extraction method disclosed by the invention is simple in process, low in requirements on production equipment, not easy to break pigment substances, and high in extraction rate.

Description

technical field [0001] The invention relates to a method for extracting natural pigments, in particular to a pigment that can be used for chestnut shell pigments, black soybean skin pigments, pitaya peel pigments, litchi shell pigments, grape seed proanthocyanidins, hickory exocarp pigments, and acorn shell pigments. , citrus peel yellow pigment, hazelnut shell pigment, nectarine peel red pigment, purple sweet potato pigment, and purple black sorghum shell pigment. 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 c...

Claims

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Application Information

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IPC IPC(8): C09B61/00A23L1/30A23L1/275
Inventor 刘国庆赵肖胡卫华钱晓勇
Owner SHANGHAI LAMP BIOLOGICAL SCI & TECH
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