Process for preparing superparamagnetic starch
A superparamagnetic and starch technology, applied in the field of preparation, can solve the problems of non-uniformity, wide magnetic particle size, difficult superparamagnetic performance, etc., and achieve good biocompatibility, small structure and properties, high-tech additional effect of value
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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, add 50 parts of cross-linked and carboxymethylated cornstarch and 300 parts of deionized water into the reaction tank, stir into starch milk. Introduce nitrogen, and use 10% hydrochloric acid or sulfuric acid solution, or use 2% sodium hydroxide Or sodium bicarbonate solution to adjust the pH of the starch milk to 6.5±0.2. Add 0.5mol / L ferrous sulfate solution relative to the starch weight of 1400 parts, and keep stirring, react for 3 hours, so that the starch can fully absorb the ferrous ions in the solution After the reaction is completed, use centrifugal filtration to remove moisture. Place the precipitate in the 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, Make the pH of the starch milk reach 9.0±0.2, stir evenly, and then place it in a water bath at 60±1°C. When the temperature reaches the temperature, slowly add 30% (weight percen...
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