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Method for extracting blue pigment from purple cabbage

A technology of blue pigment and purple cabbage, applied in chemical instruments and methods, azo dyes, organic dyes, etc., can solve the problems of limited promotion significance, time-consuming and labor-consuming, cumbersome preparation methods, etc., and achieve simple and easy-to-control extraction methods, The effect of short time and optimized extraction process

Inactive Publication Date: 2017-12-29
浦江县泰如食品科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The Chinese invention patent of CN 104017391 B discloses a method for extracting edible blue pigment from onions. The inventive method is to pickle red onions with acetic acid solution until the onions turn blue-green, and then add 95% ethanol solution The filtrate is soaked and extracted, the filtrate is concentrated and separated, and the blue pigment powder is obtained by purification. The method of the invention is simple, and the obtained blue pigment has a bright color and high color value; however, the preparation method is somewhat cumbersome, and the onion needs to be soaked in acetic acid solution for 10 minutes. Days, the purification process needs to use hydroxypropyl dextran gel column and resin column, the extraction process is too time-consuming and labor-intensive, and the content of blue pigment in onion is less, so the yield of the inventive method is low, and it is not popularized limited meaning

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A method for extracting blue pigment from purple cabbage, including the following steps:

[0017] 1) Take fresh and non-rotted purple cabbage, rinse with clean water, dry and chop, accurately weigh 20g sample, add 400g distilled water to make a slurry, 30°C constant temperature water bath for 40 minutes, the extract is centrifuged at 4000r / min for 10 minutes, take Supernatant; 2) Place the leached supernatant in a container under dark conditions, adjust the temperature to 55°C, add 0.30mol / L hydrochloric acid to adjust the pH to 2, and add 0.010g of active peptide at the same time. The crude extract is obtained by microwave radiation at 550W power for 3 minutes; when the pH value of the pigment extract is in the range of 2-3, the pigment extract can exist stably, which is the best pH value for extracting pigment; 3) Pigment After the crude extract passes through the rotary evaporator, it is dried in a vacuum oven to obtain the pigment colloid. The pigment colloid is dissol...

Embodiment 2

[0019] A method for extracting blue pigment from purple cabbage includes the following steps:

[0020] 1) Extraction: The fresh purple cabbage is beaten and then extracted with distilled water, and the supernatant is taken after centrifugation; the extraction can remove the impurities such as cellulose in the purple cabbage and prepare for further extraction;

[0021] 2) Microwave extraction: place the leached supernatant in a container under dark conditions, adjust the temperature to 60°C, add 0.35mol / L hydrochloric acid to adjust the pH to 3, and add 0.012 parts of active peptide at the same time. Microwave radiation at 600W power for 5 minutes to obtain a crude extract; metal ions can change the color of the pigment, and even change the structure of the pigment, and the protective agent can form a complex with the metal ions in the system to avoid metal ions Effect on pigment;

[0022] 3) Purification: The crude pigment extract is dried in a vacuum oven to obtain the pigment coll...

Embodiment 3

[0024] A method for extracting blue pigment from purple cabbage, including: extraction, microwave extraction, and purification, specifically including the following steps:

[0025] Extraction: Take fresh and non-rotted purple cabbage, rinse with clean water, dry and chop, accurately weigh 30 samples, add 750 parts of 30wt.% ethanol solution to make the pulp, 32 ℃ constant temperature water bath for 45 minutes, the extract is Centrifuge at 4200r / min for 115 minutes, and take the supernatant; extraction can remove impurities such as cellulose in the purple cabbage to prepare for further extraction;

[0026] Microwave extraction: place the leached supernatant in a container under dark conditions, adjust the temperature to 60°C, add 0.30mol / L hydrochloric acid to adjust the pH to 2.2, and add 0.010 parts of active peptides at 580W The crude extract is obtained by microwave radiation at power for 5 minutes; when the pH value of the pigment extract is in the range of 2-3, the pigment ext...

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PUM

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Abstract

The invention discloses a method for extracting a blue pigment from purple cabbage. The method comprises steps as follows: digestion, microwave extraction and purification; purple cabbage pulp is digested through a digestion liquid and then centrifuged, microwave irradiation extraction is performed after a protectant is added to the liquid supernatant, and an ethanol solution of pigment colloid is purified through a silica gel chromatographic column. The method has the benefits as follows: the extraction method is simple and easy to control, consumes short time and is time-saving and labor-saving and suitable for large-scale operation, the process parameters such as temperature, pH values, solid-to-liquid ratio, extraction time, microwave power and the like in an extraction process are effectively controlled, the extraction process is optimized, and the influence of extraction conditions on the blue pigment is reduced to the minimum; a few metal ions in the system can change the color of the pigment and even can change the structure of the pigment, the protectant is added and can form a complex together with the metal ions in the system, and accordingly, the influence of the metal ions on the pigment is avoided. The method for extracting the blue pigment from purple cabbage is safe and efficient.

Description

Technical field [0001] The invention belongs to the field of plant pigment extraction, and particularly relates to a method for extracting blue pigment from purple cabbage. technical background [0002] Purple cabbage is also known as red cabbage, purple cabbage or purple fennel white, commonly known as purple cabbage, a variety of Brassica oleracea and Brassica spp., a type of cabbage. Because the outer leaves and leaf balls are purple-red, they are called purple cabbage, or purple cabbage. The leaves are purple-red, with wax powder on the leaf surface, and the leaf bulbs are nearly round, rich in nutrients, and purple cabbage is rich in nutrients. According to measurements, every 100 grams of fresh vegetables contains 0.11 mg of carotene and vitamin B 1 0.04 mg, vitamin B 2 0.04 mg, vitamin C39 mg, niacin 0.3 mg, carbohydrate 4%, protein 1.3%, fat 0.3%, crude fiber 0.9%, calcium 100 mg, phosphorus 56 mg, iron 1.9 mg. The antioxidant ingredients contained in purple cabbage can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B61/00C09B67/54
CPCC09B61/00C09B67/0096
Inventor 刘洋
Owner 浦江县泰如食品科技有限公司
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