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Oxidative polymerization method of dopamine and its application

An oxidative polymerization and dopamine technology, applied in dyeing, cosmetics, pharmaceutical formulations, etc., can solve the problems of harsh reaction conditions and damage to the structure, and achieve the effects of mild conditions, simple reaction conditions, and excellent color fastness.

Active Publication Date: 2022-07-26
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these methods can effectively increase the reaction rate, due to the use of strong oxidants, the reaction conditions become harsh and may destroy the structure of surface-modified materials such as fabrics or hair.

Method used

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  • Oxidative polymerization method of dopamine and its application
  • Oxidative polymerization method of dopamine and its application
  • Oxidative polymerization method of dopamine and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] (1) Preparation of Fe 2+ The ion concentration is 10 -4 A 0.2 mol / L acetic acid / sodium acetate buffer solution with a pH value of 5 in mol / L, add dopamine to the solution at 25 ° C so that the concentration of dopamine in the solution is 0.5 wt%, and use a UV spectrophotometer. The kinetics of the oxidative polymerization of dopamine in this solution were examined.

[0080] (2) Prepare Fe separately 3+ , Zn 2+ , Cu 2+ , Al 3+ , Ba 2+ , Mg 2 +, Ca 2+ , Ni 2+ , Cr 3+ The ion concentration is 10 -4 mol / L of acetic acid / sodium acetate buffer solution with a pH of 5 and a concentration of 0.2 mol / L, adding dopamine to each solution at 25°C so that the concentration of dopamine in each solution is 0.5 wt%, respectively, using UV light. The kinetics of oxidative polymerization of dopamine in each solution was detected by spectrophotometer.

[0081] figure 1 The kinetic results of the oxidative polymerization of dopamine catalyzed by different metal ions at pH 5 ar...

Embodiment 2

[0086] Prepare Fe separately 2+ The ion concentration is 10 -4 The pH values ​​of mol / L are 3, 4, 5, 6, 7, 8, and 9, respectively, Tris-HCl buffer solution with a concentration of 0.1 mol / L or acetic acid / sodium acetate with a concentration of 0.2 mol / L, at 25 ℃ Dopamine was added to each solution so that the concentration of dopamine in each solution was 0.5wt%, and the oxidative polymerization kinetics of dopamine in each solution was detected by UV spectrophotometer.

[0087] image 3 showing Fe 2+ Kinetic results of ion-catalyzed oxidative polymerization of dopamine under different pH conditions.

[0088] image 3 The UV detection results shown show that at pH 3 containing Fe 2+ The absorbance in the buffer solution of ions is basically unchanged, and it can hardly play the role of catalyzing the oxidative polymerization of dopamine. Contains Fe at pH 4 2+ In the buffer solution of ions, the absorbance gradually increased, indicating that the oxidative polymerizatio...

Embodiment 3

[0090] (1) Preparation of Fe 2+ The ion concentration is 10 -4 mol / L Tris-HCl buffer solution with a pH of 7 and a concentration of 0.1 mol / L, add dopamine to the solution at 25°C so that the concentration of dopamine in the solution is 0.5 wt%, and detect with an ultraviolet spectrophotometer Oxidative polymerization kinetics of dopamine in this solution.

[0091] (2) Prepare Fe separately 3+ , Zn 2+ , Cu 2+ , Al 3+ , Ba 2+ , Mg 2 +, Ca 2+ , Ni 2+ , Cr 3+ The ion concentration is 10 -4 mol / L Tris-HCl buffer solution with a pH value of 7 and a concentration of 0.1 mol / L, add dopamine to each solution at 25°C so that the concentration of dopamine in each solution is 0.5 wt%, respectively, using UV spectroscopy The kinetics of oxidative polymerization of dopamine in each solution were measured by photometer.

[0092] Figure 4 The kinetic results of the oxidative polymerization of dopamine catalyzed by different metal ions at pH 7 are shown. Figure 5 The results o...

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Abstract

The present invention relates to a method for oxidative polymerization of dopamine and its application. The oxidative polymerization method includes the following steps: preparing a buffer solution with a pH value above 4; using the buffer solution as a solvent, preparing a buffer solution containing Fe 2+ solution of ions; in the atmosphere, to the Fe-containing 2+ Dopamine is added to the solution of ions and polymerized to obtain polydopamine. The oxidative polymerization of dopamine is carried out by the method provided by the invention, which can realize the rapid oxidative polymerization of dopamine while maintaining the advantages of simple and mild reaction conditions, especially when it is carried out under weakly acidic and neutral conditions. The method provided by the present invention can realize the modification of the surface of the material by depositing polydopamine on the surface of the material to be modified, and has particularly beneficial technical effects on the dyeing of fabrics, hair dyeing, etc. Simple, mild conditions for fast coloring of hair with excellent color fastness.

Description

technical field [0001] The present invention relates to the technical field of oxidative polymerization of dopamine, in particular to a method for oxidative polymerization of dopamine with simple, mild and fast reaction conditions and its application, especially the application in surface modification of materials to be modified. Background technique [0002] Dopamine (DA) dissolved in an alkaline aqueous solution can undergo spontaneous oxidative polymerization under the action of oxygen to generate polydopamine. Polydopamine (PDA for short) has a series of unique physicochemical properties, including simple preparation, good adhesion, chemical reactivity, metal chelation ability, biocompatibility, biodegradability, free radical trapping ability, light Thermal conversion capability, etc. [0003] Therefore, the use of spontaneous oxidative polymerization of dopamine to deposit polydopamine on the surface of materials has become a commonly used surface modification method. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/06A61K8/84A61Q5/10D06P1/52
CPCC08G73/0672A61K8/84A61Q5/10D06P1/5264
Inventor 张拥军周晓曼
Owner TIANJIN POLYTECHNIC UNIV
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