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Method for extracting gynura bicolor purpurin

An extraction method and technology for violet pigments, applied in chemical instruments and methods, azo dyes, organic dyes, etc., can solve the problems of impure color and luster of pigment products, and achieve large-scale production, meet market demand, and simplify the process. Effect

Inactive Publication Date: 2010-03-03
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] At present, when researchers extract purple pigments such as sweet potato pigment and geranium purple pigment, most of them use alcohol as the extractant. Since the leaves of red broccoli also contain chlorophyll in addition to purple pigment, alcohol can also extract purple pigment. Leaf green will be extracted, which requires a more complicated separation process in the later stage of pigment extraction to obtain pure purple pigment, otherwise the color of the pigment product will not be pure

Method used

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  • Method for extracting gynura bicolor purpurin
  • Method for extracting gynura bicolor purpurin

Examples

Experimental program
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Embodiment 1

[0030] The extraction of the red phoenix purple pigment of the present embodiment specifically comprises the following steps:

[0031] (1) Preparation of purple pigment extract

[0032] Pre-fill water in the extraction pot and heat the water to boil;

[0033] Wash the red phoenix leaves, drain and wash, weigh the leaves, and place 1 kg of leaves in an extraction pot equipped with boiling water;

[0034] The weight ratio of vegetable leaves and boiling water is 1:4;

[0035] After extracting at 100°C for 15 minutes, pour out the extract in the extraction pot, filter off the vegetable leaves, and filter the extract to obtain the desired purple pigment extract.

[0036] (2) Separation and purification of purple pigment

[0037] The separation and purification of purple pigment adopts macroporous adsorption resin.

[0038] The macroporous adsorption resin adopts domestic resin AB-8.

[0039] In the reaction vessel with stirring, pack the aforementioned gained purple pigment e...

Embodiment 2

[0043] The extraction of the red phoenix purple pigment of the present embodiment specifically comprises the following steps:

[0044] (1) Preparation of purple pigment extract

[0045] Pre-fill water in the extraction pot and heat the water to boil;

[0046] Wash the red phoenix vegetable leaves, drain and wash the water, weigh the vegetable leaves, and place 1.5kg of vegetable leaves in an extraction pot equipped with boiling water;

[0047] The weight ratio of vegetable leaves and boiling water is 1:6;

[0048] After extracting at 90°C for 45 minutes, pour out the extract in the extraction pot, filter off the vegetable leaves, and filter the extract to obtain the desired purple pigment extract.

[0049] (2) Separation and purification of purple pigment

[0050] The separation and purification of purple pigment adopts macroporous adsorption resin.

[0051] The filler is NKA-9 macroporous adsorption resin, and the column is packed according to the aspect ratio of 60:1.

...

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PUM

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Abstract

The invention discloses a method for extracting gynura bicolor purpurin. The method comprises the following steps: taking water as an extraction agent, combining with macroporous adsorptive resin, purifying and obtaining natural purpurin from gynura bicolor by extraction. The invention adopts the gynura bicolor as a raw material for extracting the purpurin and is beneficial for large-scale production, the obtained purpurin is safe and reliable, and the extracting cost is greatly lowered. The invention adopts the water as an extracting reagent for extracting the purpurin in the gynura bicolor,can effectively avoid extracting chlorophyll in the gynura bicolor together, ensures that the obtained extracting liquid only contains the purpurin, and does not need to carry out a complicated separation technique at the later period.

Description

technical field [0001] The invention relates to the field of preparation of edible pigments, in particular to a method for extracting natural purple pigments in red phoenix vegetables. Background technique [0002] Food coloring is an important food additive, there are natural coloring and synthetic coloring. Synthetic pigments have a certain degree of concern about toxic and side effects, and people tend to use natural pigments. Natural food coloring not only has high safety, but also has certain nutritional value or pharmacological effect, so it is very popular among consumers. [0003] Anthocyanin pigments are a class of flavonoid pigments widely present in plants. These substances are red to purple in acidic conditions and have good stability. Research results in recent years have shown that anthocyanins have the ability to resist oxidation and capture oxygen free radicals, and are a class of natural active substances with health care functions. Therefore, in addition...

Claims

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Application Information

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IPC IPC(8): C09B61/00
Inventor 李雁群庄莹莹彭妙会李慧英
Owner SOUTH CHINA NORMAL UNIVERSITY
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