Hydroxycamptothecin sustained-release microsphere and preparation method thereof
A technology of hydroxycamptothecin and slow-release microspheres, which is applied in the direction of microcapsules, pharmaceutical formulas, and medical preparations containing active ingredients, etc., can solve the problems of poor system reproducibility, low production efficiency, and wide distribution range, and achieve The effect of low cost, small dosage and simple preparation method
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Embodiment 1
[0025] Embodiment 1: take by weighing 30mg of HCPT crude drug, polylactic acid (PLA) 300mg that molecular weight is 5000, put in the beaker with 30ml DMF and CH Cl mixed solution dissolves; With 5% polyvinyl alcohol (PVA) and 1% dodecyl Sodium sulfate (SDS) mixed aqueous solution was used as the continuous phase, and the drug-loaded particles were prepared through a membrane emulsifier; the obtained emulsion was centrifuged at 2000r / min, the precipitate was collected and freeze-dried to obtain the drug-loaded microspheres before modification; Microspheres. Add 10 ml of 0.5% N-succinyl chitosan in PBS solution during stirring, coat for 1 hour, collect the precipitate after centrifugation, wash with water for 3 times, place in a 40°C oven and vacuum-dry to obtain a powder preparation. figure 1 Provide the composition schematic diagram of the hydroxycamptothecin microsphere of the embodiment of the present invention, carrier 2 is polylactic acid (PLA), wraps anticancer drug hydro...
Embodiment 2
[0026] Embodiment 2: take by weighing 20mg of HCPT crude drug, polylactic acid (PLA) 400mg that molecular weight is 10000, put in beaker with 40ml DMF and CH 2 Cl 2 The mixed solution is dissolved; the mixed aqueous solution of 0.5% polyvinyl alcohol (PVA) and 0.5% sodium dodecyl sulfate (SDS) is used as the continuous phase, and the drug-loaded particles are prepared by a membrane emulsifier; the obtained emulsion is centrifuged at a speed of 1800r / min, Collect the precipitate and lyophilize to obtain the drug-loaded microspheres before modification; then weigh 50 mg of the drug-loaded microspheres. Add 10 ml of 0.5% N-succinyl-O-carboxymethyl chitosan in PBS solution during stirring, coat for 1 hour, collect the precipitate after centrifugation, wash with water for 3 times, and vacuum-dry in an oven at 45°C to obtain a powder preparation.
Embodiment 3
[0027] Embodiment 3: take by weighing 20mg of HCPT crude drug, polylactic acid (PLA) 300mg that molecular weight is 15000, put in beaker with 40ml DMF and CH 2 Cl 2 The mixed solution is dissolved; the mixed aqueous solution of 1% polyvinyl alcohol (PVA) and 0.5% sodium dodecyl sulfate (SDS) is used as the continuous phase, and the drug-loaded particles are prepared by a membrane emulsifier; the obtained emulsion is centrifuged at a speed of 2500r / min, Collect the precipitate and lyophilize to obtain the drug-loaded microspheres before modification; then weigh 30 mg of the drug-loaded microspheres. Add 20 ml of 0.2% N-lactose acylated succinyl chitosan in PBS solution during stirring, coat for 1 hour, collect the precipitate after centrifugation, wash with water for 3 times, place in a 50°C oven and vacuum-dry to obtain a powder preparation.
[0028] The drug in vitro cumulative release curve of embodiment 3 is shown in image 3 ,From image 3 It can be seen that the releas...
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