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Method for extracting black pigment from black waxy corn complete cobs

A technology of black waxy corn and melanin, applied in chemical instruments and methods, azo dyes, organic dyes, etc., can solve the problems of chemical toxicity, synthetic pigment without nutrition, etc., and achieve easy preparation, short production cycle and high quality of pigment Effect

Inactive Publication Date: 2012-02-15
安徽大诚明农业科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although synthetic pigments are bright in color, strong in coloring power, and stable in nature, synthetic pigments are non-nutritive and chemically toxic

Method used

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  • Method for extracting black pigment from black waxy corn complete cobs
  • Method for extracting black pigment from black waxy corn complete cobs
  • Method for extracting black pigment from black waxy corn complete cobs

Examples

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Embodiment Construction

[0017] Through the following specific implementation examples, the present invention can be further understood, but the following examples are not limitations of the present invention.

[0018] The process for extracting melanin from the whole ear of black waxy corn involved in the present invention comprises the steps of:

[0019] 1. Using the whole ear of mature black waxy corn as raw material, drying until the water content is lower than 14%, and crushing;

[0020] 2. Degrease the pulverized raw materials with petroleum ether (60°C-90°C), and dry them;

[0021] 3. Extract twice with 12 times 0.05mol / HCL solution, 12 hours each time, collect the extract, and concentrate under reduced pressure;

[0022] 4. Dissolve the concentrated solution in a small amount of water, and after purification with D101 macroporous resin, first elute with distilled water until it becomes colorless, then use 50% ethanol solution as the eluent for eluting;

[0023] 5. Collect the eluent, recover...

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Abstract

The invention belongs to an extraction method of black pigment, and particularly relates to a method for extracting black pigment from black waxy corn, which comprises the following steps: by using dry black waxy corn complete cobs as the raw material, degreasing with a weakly polar solvent, and leaching with a 0.05mol / HCl solution for 12 hours, wherein the ratio of sample to leaching agent is 1:12; after carrying out secondary leaching at 60 DEG C, slightly concentrating under reduced pressure (the vacuum degree is 0.9 MPa) at 60 DEG C, and dissolving by adding water; and after purifying with macroporous resin, eluting with distilled water until the solution becomes colorless, eluting with a 50-70% ethanol solution (eluting agent), concentrating the ethanol eluate under reduced pressure to obtain an extract, and drying to obtain the finished black pigment product. The purity of the black pigment is obviously higher than that of the unpurified black pigment, and the extraction rate is up to 9.62%. The invention can be used for obtaining high-purity black pigment; the preparation method is scientific and reasonable, is simple and easy to implement, changes wastes into valuable substances, solves the problem in treatment of corn cob waste, and provides a new application of corn cobs.

Description

【Technical field】 [0001] The invention belongs to a method for extracting melanin, more specifically, relates to a method for extracting melanin from whole ears of black waxy corn. 【Background technique】 [0002] Black waxy corn is a characteristic corn variety, soft in texture, delicate in taste, rich in fragrance, rich in mineral elements such as calcium and magnesium, and rich in natural melanin, which has extremely high nutritional and health value. The natural melanin extracted from the peel is a pure natural flavonoid compound, which belongs to anthocyanin pigment and is water-soluble. The pigment has the functions of anti-oxidation and scavenging free radicals in the human body, and has the functions of enhancing human immunity, anti-aging, softening blood vessels, and preventing and fighting cancer. When the ratio of the pigment to nitrous acid is 1:3, it can inhibit the formation of 99% of nitrous acid carcinogens. [0003] At present, the demand for natural pigme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B61/00C07D311/62
Inventor 谢雷赵劲松李彬孙宜辉
Owner 安徽大诚明农业科技股份有限公司
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