PH-sensitive reduction responsive nanogel and preparation method thereof
A nanogel and nanohydrogel technology, which is applied in the directions of inactive medical preparations, pharmaceutical formulations, inactive macromolecular compounds, etc., can solve the problems of premature disintegration of nanoparticles and low particle stability. , to achieve the effect of good stability
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Embodiment 1
[0050] (1) Take 1% (W / V) sodium alginate aqueous solution, add periodate to it according to the molar ratio of the sugar unit of sodium alginate to periodate is 1:0.5, and keep away from light at 25°C After stirring for 8 h, ethylene glycol was added to terminate the reaction. Then, ethanol was added to precipitate a precipitate, and a white product was obtained by suction filtration under reduced pressure. The product was re-dissolved in deionized water, re-precipitated with ethanol, and dried to obtain dialdehyde sodium alginate with an oxidation degree of 44.36%.
[0051] (2) Take the above-mentioned bisaldehyde sodium alginate aqueous solution with a weight percentage of 0.3%, and add the ethanol of 4-mercaptoaniline according to the molar ratio of the aldehyde group of bisaldehyde sodium alginate to the amine group of 4-mercaptoaniline at 1:1. solution, after mixing and stirring for 6 hours, add NaBH 4 , adjusted the pH value to 7.0 with 0.1M HCl, controlled the tempera...
Embodiment 2
[0054] (1) Take 2% (W / V) sodium alginate aqueous solution, add periodate to it according to the molar ratio of the sugar unit of sodium alginate to periodate is 1:0.5, and keep away from light at 25°C After stirring for 8 h, ethylene glycol was added to terminate the reaction. Then, ethanol was added to precipitate a precipitate, and a white product was obtained by suction filtration under reduced pressure. The product was re-dissolved in deionized water, re-precipitated with ethanol, and dried to obtain dialdehyde sodium alginate with an oxidation degree of 42.57%.
[0055] (2) Take the above-mentioned bisaldehyde sodium alginate aqueous solution with a weight percentage of 0.2%, according to the molar ratio of the aldehyde group of bisaldehyde sodium alginate to the amine group of 4-mercaptoaniline is 1:0.75, add 4-mercaptoaniline ethanol solution, after mixing and stirring for 6 hours, add NaBH 4 , adjusted the pH value to 7.0 with 0.1M HCl, controlled the temperature bel...
Embodiment 3
[0058] (1) Take 1% (W / V) sodium alginate aqueous solution, add periodate to it according to the molar ratio of sugar unit of sodium alginate to periodate is 1:0.25, and keep away from light at 25°C After stirring for 8 h, ethylene glycol was added to terminate the reaction. Then, ethanol was added to precipitate a precipitate, and a white product was obtained by suction filtration under reduced pressure. The product was re-dissolved in deionized water, re-precipitated with ethanol, and dried to obtain dialdehyde sodium alginate with an oxidation degree of 24.66%.
[0059] (2) Take the above-mentioned dialdehyde sodium alginate aqueous solution with a weight percentage of 0.3%, and add the ethanol of 4-mercaptoaniline according to the molar ratio of the aldehyde group of dialdehyde sodium alginate to the amine group of 4-mercaptoaniline is 1:1.25. solution, after mixing and stirring for 6 hours, add NaBH 4 , adjusted the pH value to 7.0 with 0.1M HCl, controlled the temperatu...
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