Rapid preparation of pH-sensitive polymeric nanoparticle with high loading capacity using electrospray for oral drug delivery.

Drug loading capacity is an important property for an ideal drug delivery system. However, the drug loading capacity of prepared pH-sensitive polymeric nanoparticles is usually low. To overcome this drawback, the electrospray method was used to prepare Eudragit L 100-55 nanoparticles with high drug loading capacity in one step. Omeprazole was selected as the model drug. The maximum loading capacity of nanoparticles was 43.21% by changing the mass ratio of drug to polymer, and the entrapment efficiency was nearly 100%. The prepared nanoparticle showed spherical or ellipsoidal morphology and the average diameter was about 300 nm. The pH-sensitive nanoparticle displayed pH-dependent release in vitro. In addition, a slight cytotoxicity was detected in the cytotoxicity study. The results indicated that electrospray is an easy, rapid and efficient technique for the preparation of high-loading pH-sensitive polymeric nanoparticles, and the pH-sensitive nanoparticle is a promising carrier for oral drug delivery.