A kind of preparation method of chitosan-based porous microsphere
A technology of porous microspheres and chitosan, which is applied in the preparation of microspheres, microcapsule preparations, chemical instruments and methods, etc., can solve the problems of increased environmental burden, consumption of raw materials, complicated processes, etc., to avoid biological toxicity and save raw materials. , the effect of simple process
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Embodiment 1
[0039] The preparation method of embodiment 1 chitosan porous microspheres comprises the steps:
[0040] 1. Dissolve 1 g of chitosan in 100 mL of 1 wt % acetic acid aqueous solution, and remove foam.
[0041] 2. Dissolve 5g of Span 80 in 100mL petroleum ether solution.
[0042] 3. Take 10 mL of the chitosan solution obtained in step 1 as a dispersed phase and slowly add it to the continuous phase solution obtained in step 2, and stir at a high speed to obtain an emulsion.
[0043] 4. Place the emulsion in a freezer at -20°C for 4 hours to freeze and quench.
[0044] 5. Pour the mixed coagulation solution of 1wt% NaOH ethanol water at -20°C into the quenched emulsion and soak for 3 hours.
[0045] 6. Centrifuge to obtain chitosan microspheres, wash with ethanol and water for several times and then dry to obtain the product.
[0046] The chitosan microspheres that present embodiment prepares, its size and surface morphology are as follows figure 1 As shown, the size of the m...
Embodiment 2
[0047] The preparation method of embodiment 2 chitosan / PVA porous microspheres comprises the steps:
[0048] 1. Dissolve 0.5g chitosan and 0.5g PVA in 100mL of 1wt% acetic acid aqueous solution, and defoam.
[0049] 2. Dissolve 5g of Span 80 in 100mL petroleum ether solution.
[0050] 3. Take 10 mL of the mixed solution obtained in step 1 as the dispersed phase and slowly add it to the continuous phase solution obtained in step 2, and stir at high speed to obtain an emulsion.
[0051] 4. Place the emulsion in a freezer at -20°C for 4 hours to freeze and quench.
[0052] 5. Pour the mixed coagulation solution of 1wt% NaOH ethanol water at -20°C into the quenched emulsion and soak for 3 hours.
[0053] 6. Centrifuge to obtain chitosan / PVA composite microspheres, wash with ethanol and water respectively for several times, and then dry to obtain the product.
[0054] The chitosan / PVA composite microsphere that present embodiment prepares, its appearance is as follows image 3 ...
Embodiment 3
[0055] The preparation method of embodiment 3 chitosan / gelatin porous microspheres comprises the steps:
[0056] 1. Dissolve 0.5 g chitosan and 0.5 g gelatin in 100 mL of 1 wt % acetic acid aqueous solution, and defoam.
[0057] 2. Dissolve 5g of Span 80 in 100mL of toluene solution.
[0058] 3. Take 10 mL of the mixed solution obtained in step 1 as the dispersed phase and slowly add it to the continuous phase solution obtained in step 2, and stir homogeneously at a high speed to obtain an emulsion.
[0059] 4. Place the emulsion in a freezer at -20°C for 4 hours to freeze and quench.
[0060] 5. Pour the mixed coagulation solution of 1wt% NaOH ethanol water at -20°C into the quenched emulsion and soak for 3 hours.
[0061] 6. Centrifuge to obtain chitosan / gelatin composite microspheres, wash with ethanol and water for several times, and vacuum dry to obtain the product.
[0062] The chitosan / gelatin composite porous microsphere that present embodiment prepares, its morphol...
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