[Preparation and in vitro drug release study of long-circulating hydroxycamptothecin nanoparticles].

OBJECTIVE

To prepare long-circulating hydroxycamptothecin nanoparticles and study its in vitro drug release characteristics.

METHODS

The HCPT-PEG-PCL-NPs were prepared by solvent-diffusion method using PEG-PCL block copolymer synthesized as a matrix and HCPT as an antitumor agent. Then the obtained NPs were evaluated and its in vitro drug release characteristics were investigated.

RESULTS

When using PEG4000-PCL2000, PEG4000-PCL1250, PEG2000-PCL2000, PEG2000-PCL1250 as the carrier material to prepare NPs, the average particle size of NPs in turn were 116.1, 110.0, 119.9, 99.1 nm; the zeta potential were -22.4, - 16. 9, -33.5, - 28.8 mV; the entrapment efficiency were 88.29%, 83.10%, 80.67%, 77.46%; and the drug loading were 2.96%, 2.56%, 2.31%, 2.14%, respectively. HCPT-PEG-PCL-NPs all showed a certain degree of sustained-release characteristics and their release mechanisms were fitted to Weibull modle, which showed that the drug release process included passive diffusion and matrix-eroded procedure.

CONCLUSION

The HCPT-PEG-PCL-NPs has high entrapment efficiency, drug loading, uniform particle size, and can retard drug release in vitro, so it provides an extensive prospect for clinical application of HCPT.