Method for preparing high-viscosity chitosan quick hemostatic patch
A chitosan, high-viscosity technology, applied in medical science, bandages, absorbent pads, etc., can solve the problems of limitation, reduced mechanical strength, slow hemostasis, etc., to achieve the effect of strengthening hemostasis and mechanical strength, and controlling the amount of bleeding
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[0021] Example 1:
[0022] Take 4g of chitosan, the degree of deacetylation is 80%, the viscosity is 2000mPa·s, and the viscosity average molecular weight is 3.8×10 6 , Add 200mL of 2% acetic acid solution, stir at room temperature (20~25℃) until completely dissolved, prepare 2% chitosan solution, let stand to degas, then filter to obtain clear chitosan solution, and bake at 70℃ Dry for 1 hour, then pour the above chitosan solution into a petri dish, and put it in the precipitation solution overnight (the precipitation solution is an absolute ethanol solution with glycerol concentration 5% and NaOH concentration 0.05%) until the chitosan is completely Precipitation to form chitosan gel, rinse with deionized water to neutral. Add chloroacetic acid and isopropanol (mass ratio 1:10) into airtight glassware, heat to 70℃ after alkalization, put the previously obtained chitosan gel in and react for 30min, take it out, and use enough ethanol Wash repeatedly many times. Put the prepare...
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[0023] Example 2:
[0024] Take 4g of chitosan, the degree of deacetylation is 90%, the viscosity is 600mPa·s, and the viscosity average molecular weight is 3.0×10 6 , Add 200mL of 2% acetic acid solution, stir at room temperature (20~25℃) until completely dissolved, prepare 2% chitosan solution, let stand to degas, then filter to obtain clear chitosan solution, and bake at 70℃ Dry for 1 hour, then pour the above chitosan solution into a petri dish, and put it in the precipitation solution overnight (the precipitation solution is an absolute ethanol solution with glycerol concentration 5% and NaOH concentration 0.05%) until the chitosan is completely Precipitation to form chitosan gel, rinse with deionized water to neutral. Add chloroacetic acid and isopropanol (mass ratio 1:10) into airtight glassware, heat to 70℃ after alkalization, put the previously obtained chitosan gel in and react for 30min, take it out, and use enough ethanol Wash repeatedly many times. Put the prepared...
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