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Preparation method for melanin

A technology of melanin and melanin precursor, which is applied in the field of melanin preparation, can solve the problems of low visible light transmittance, large melanin particle size, and difficult dispersion of composite materials, and achieve strong ultraviolet shielding ability and high visible light transmittance.

Active Publication Date: 2017-10-27
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can also be obtained by oxidative polymerization of melanin precursors, but the melanin prepared by these methods has a large particle size (about 200nm), is not easy to disperse in the polymer matrix, and the visible light transmittance of the composite material is low

Method used

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  • Preparation method for melanin
  • Preparation method for melanin
  • Preparation method for melanin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Weigh 0.18g dopamine (provided by Shanghai Aladdin Biochemical Technology Co., Ltd., specification: AR) and dissolve it in 100g of polyethylene glycol (concentration is 0.01%) (Sinopharm Chemical Reagent Co., Ltd., specification: AR) and stearin In the acid (0.01%) solution, feed 0.37g of oxygen, (the molar ratio of dopamine to oxygen is 1:10) to adjust the pH value of the solution to 8.4, 40°C, after stirring for 10 hours, the reaction is over, after centrifugation ,get melanin 1 . The average diameter is about 300nm.

Embodiment 2

[0037] Weigh 0.2g of catechol (provided by Shanghai Aladdin Biochemical Technology Co., Ltd., specification: AR) and 2g of sodium persulfate (Sinopharm Chemical Reagent Co., Ltd., specification: AR), (catechol and persulfate The mol ratio of sodium is 1:5) is dissolved in containing 100g containing polyethylene glycol (concentration is 1%) (Sinopharm Chemical Reagent Co., Ltd., specification: AR) and sodium dodecylbenzenesulfonate (concentration is 1%) ) (Sinopharm Group Chemical Reagent Co., Ltd., specification: AR) solution (100g) in the solution, adjust the pH value of the solution to 9,60 ° C, after stirring for 5 hours, the reaction ends, through centrifugation, to obtain melanin 2 . The average diameter is about 150nm.

Embodiment 3

[0039] Weigh 0.2g dopa (provided by Shanghai Aladdin Biochemical Technology Co., Ltd., specification: AR) and 1.4g sodium persulfate (Sinopharm Chemical Reagent Co., Ltd., specification: AR) (the molar ratio of dopa to sodium persulfate 1:6), dissolved in 100g containing polyethylene glycol (concentration is 2%) (Sinopharm Group Chemical Reagent Co., Ltd., specification: AR) and sodium dodecylbenzenesulfonate (concentration is 1%) (Sinopharm Group Chemical Reagent Co., Ltd., specification: AR) solution, adjust the pH value of the solution to 9, 65 ° C, after stirring for 8 hours, the reaction is over, after centrifugation, to obtain melanin 3 . The average diameter is about 100 nm.

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Abstract

The invention discloses a preparation method for melanin. The preparation method comprises the following steps: adding a melanin precursor, a surfactant and an oxidant into a polymer solution respectively; regulating the pH (Potential of Hydrogen) value to be 7 to 13; and while stirring, carrying out an oxidization reaction to prepare the melanin, wherein the mol ratio of the melanin precursor to the oxidant is 1 to (0.1 to 10), the concentration of a water-soluble polymer is 0.01% to 5% and the concentration of the surfactant is 0.01% to 2%. The melanin prepared by the preparation method has a relatively small particle diameter; and a functional thin film prepared by utilizing melanin granules prepared by the preparation method has a strong ultraviolet shielding function and has high visible light transmittance.

Description

technical field [0001] The invention relates to the field of melanin composite materials, and furthermore, relates to a preparation method of melanin. Background technique [0002] Melanin is a class of macromolecules containing phenolic hydroxyl and amino groups in its structural units. It is widely found in animals and plants and can be divided into eumelanin and pheomelanin. Eumelanin can be produced from L-3,4-dihydroxyphenylalanine (3,4-dihydroxy-L-phenylalanine, L-DOPA) or 2-(3,-dihydroxyphenyl)ethylamine [2-(3, 4-dihydroxyphenyl) ethylamine, dopamine (dopamine)] synthesized. Melanin has many biological functions. It can absorb ultraviolet rays to protect organisms from some radiation damage, can absorb superoxide free radicals, has superior free radical scavenging ability, and plays the role of anti-oxidation and anti-aging. In addition, melanin also has properties such as metal chelation and photosensitization. Therefore, utilizing the properties of melanin, it i...

Claims

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Application Information

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IPC IPC(8): C09B61/00B82Y40/00C08L67/03C08L67/02C08L69/00C08L33/12C08K11/00C08L25/06
CPCB82Y40/00C08K11/00C09B61/00C08L67/03C08L67/02C08L69/00C08L33/12C08L25/06
Inventor 东为富汪洋李婷马丕明陈明清
Owner JIANGNAN UNIV
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