Process for preparing superparamagnetic starch

A superparamagnetic and starch technology, applied in the field of preparation, can solve problems such as unevenness, wide magnetic particle size, difficult superparamagnetic properties, etc., to achieve good biocompatibility, small structure and properties, high-tech additional value effect

Inactive Publication Date: 2007-05-30
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing magnetic polymer material preparation method is difficult to achieve superparamagnetic properties and the particle size of the magnetic particles is relatively wide and uneven, and the use of starch has good biocompatibility and controllable biological Degradability, as a carrier for magnetic biopolymers, especially for the preparation of magnetic drugs and magnetic biomaterials, a new type of magnetic polymer material - superparamagnetic starch is prepared by replacing synthetic polymers with natural biopolymer starch

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: (take by weight)

[0028] Add 100 parts of cornstarch and 400 parts of deionized water into the reaction tank and stir into starch milk. Nitrogen is introduced, and the pH of the starch milk is adjusted to 4.5 ± 0.2 with 10% sulfuric acid or hydrochloric acid solution, or with 2% sodium hydroxide or sodium bicarbonate solution. Add 1800 parts of 0.5 mol / L ferrous sulfate solution relative to the starch weight, and keep stirring, react for 5 hours, so that the starch fully absorbs the ferrous ions in the solution. After the reaction was completed, vacuum filtration was used to remove moisture. Put the precipitate in a reaction tank, add 400 parts of deionized water to the weight of the starch, stir and disperse, then slowly add 0.5 mole of sodium hydroxide solution dropwise while stirring, so that the pH of the starch milk reaches 10.0±0.2, stir evenly, Then place it in a water bath at 48±1°C. When the temperature reaches the temperature, slowly add 30% (...

Embodiment 2

[0030] Add 100 parts of tapioca starch and 200 parts of deionized water into the reaction tank and stir into starch milk. Nitrogen is introduced, and the pH of the starch milk is adjusted to 5.3 ± 0.2 with 10% hydrochloric acid or sulfuric acid solution, or with 2% sodium hydroxide or sodium bicarbonate solution. Add 1.0 mol / L ferrous chloride solution relative to the starch weight of 300 parts, and keep stirring, react for 3 hours, so that the starch fully absorbs the ferrous ions in the solution. After the reaction was completed, vacuum filtration was used to remove moisture. Put the precipitate in a reaction tank, add 200 parts of deionized water to the starch weight, stir to disperse, then slowly add 0.5mol / L sodium hydroxide solution dropwise while stirring, so that the pH of the starch milk reaches 11.0±0.2, stir Evenly, then put it in a water bath at 40±1°C. When the temperature reaches the temperature, slowly add 30% (weight percent) hydrogen peroxide solution dropwis...

Embodiment 3

[0032]At the same time, 50 parts of cross-linked and carboxymethylated cornstarch and 300 parts of deionized water are added into the reaction tank, and stirred into starch milk. Nitrogen is introduced, and the pH of the starch milk is adjusted to 6.5 ± 0.2 with 10% hydrochloric acid or sulfuric acid solution, or with 2% sodium hydroxide or sodium bicarbonate solution. Add 0.5 mol / L ferrous sulfate solution relative to the starch weight of 1400 parts, and keep stirring, react for 3 hours, so that the starch fully absorbs the ferrous ions in the solution. After the reaction was completed, the water was removed by centrifugal filtration. Put the precipitate in a reaction tank, add 300 parts of deionized water to the starch weight, stir and disperse, then slowly add 0.5mol / L sodium hydroxide solution dropwise while stirring, so that the pH of the starch milk reaches 9.0±0.2, stir Evenly, then put it in a water bath at 60±1°C. When the temperature reaches the temperature, slowly ...

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Abstract

The invention discloses a making method of superparamagnetism starch, which comprises the following steps: allocating starch milk through starch and deionized water; adjusting pH value; adding soluble ferrous salt solution to adsorb once; filtering in the vacuum or separating centrifugally; removing water to obtain sediment; adding hydrogen peroxide solution to oxidize once; dehydrating; washing; obtaining starch product with water; repeating these steps to obtain magnified starch product with water; drying; obtaining the product.

Description

technical field [0001] The invention relates to magnetic starch, in particular to a preparation method of superparamagnetic starch. Background technique [0002] Starch is a natural biopolymer, using starch as a carrier, by adsorbing and embedding magnetic substances (F 3 o 4 , γ-F 2 o 3 , Co, Ni, Fe x N, etc.), capable of forming functional polymer materials with magnetic properties. When the diameter of the magnetic particles in the magnetic starch polymer is as small as the nanometer scale, it has superparamagnetism, and there is no coercive magnetism and remanence on the hysteresis loop, which are called superparamagnetic nanoparticles. The magnetic starch polymer with superparamagnetism is called superparamagnetic starch. Because superparamagnetic starch has many characteristics of starch and the magnetic responsiveness of superparamagnetic particles, it can not only change the functional groups (such as -OH, -COOH, -CHO, etc.) and molecular weight of starch molec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/18H01F1/42A61L31/14
Inventor 温其标邱礼平黄立新黄国平胡飞
Owner SOUTH CHINA UNIV OF TECH
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