Preparation and application of chitosan particles
A technology of chitosan and microparticles, which is applied in the field of preparation of chitosan microparticles, and can solve problems such as poor results
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Embodiment 1
[0032] The preparation of embodiment 1 chitosan microsphere
[0033] (1) Get 27.2g chitosan (made by existing methods or commercial products, molecular weight is 20~300,000, degree of deacetylation is 85~99%), add to 1800ml distilled water with mechanical stirrer, add 25ml volume The specific concentration is 36% acetic acid solution, stirred until the chitosan dissolves, and the chitosan solution is obtained for subsequent use;
[0034] (2) Use the domestic L-117 laboratory spray dryer (Beijing Laiheng Technology Trade Co., Ltd., and similar equipment from other manufacturers can also be used) to prepare micron particles. The preparation process uses a standard 0.7mm nozzle, and the drying tower enters the air The temperature is 160°C, the outlet temperature is 80-85°C, and the hot air flow rate is 90% (about 35m 3 / h), peristaltic pump flow 50% (about 600ml / h), compressed air pressure 120kPa.
[0035] The preparation method can also refer to the preparation scheme of the a...
Embodiment 2
[0037] The preparation of embodiment 2 chitosan microspheres
[0038] (1) get 28g chitosan (self-made according to existing method or commercially available product, molecular weight is 50,000, deacetylation degree is 60%) adds to 1800ml distilled water mechanical stirrer and stirs, and adding 25ml volume specific concentration is 36% Acetic acid solution is stirred until the chitosan is dissolved, and the chitosan solution is obtained for subsequent use;
[0039] (2) Use the domestic L-117 laboratory spray dryer (Beijing Laiheng Technology Trade Co., Ltd., and similar equipment from other manufacturers can also be used) to prepare micron particles. The preparation process uses a standard 0.7mm nozzle, and the drying tower enters the air The temperature is 190°C, the outlet temperature is 85-90°C, and the hot air flow rate is 90% (about 35m 3 / h), peristaltic pump flow rate 500ml / h, compressed air pressure 100kPa.
[0040] 16.5 g of chitosan microspheres were prepared with a ...
Embodiment 3
[0041] The preparation of embodiment 3 chitosan microspheres
[0042] Get 27.2g chitosan (self-made according to existing method or commercial product, molecular weight is 1,000,000, deacetylation degree is at 80%), other experimental methods are with embodiment 1.
[0043] 13.82g of chitosan microspheres were prepared with a yield of 54.2%. The particle size was measured using a laser particle size analyzer, and the average particle size was 7.87 μm.
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