title: [Study on preparation conditions for polylactide nanoparticles loaded cyclosporine A and its oral bioavailability in rats].
abstract: OBJECTIVE
  To develop a less toxic alternative for sandimmun neoral (Neoral). To study the preparation conditions and to compare its pharmacokinetic characteristics with Neoral.
  
  
  METHODS
  Polylactide nanoparticles loaded cyclosporine A was prepared by solvent-nonsolvent method. Polylactide nanoparticles were administered by oral in a dosage of 15 mg.kg-1. The CyA concentration in whole blood sample was determined by HPLC.
  
  
  RESULTS
  The quantities of CyA, PLA and volume of acetone added had significant influence on the NP diameters. Under proper condition, the nanoparticles with diameters of 57.5 nm were obtained. The relative bioavailability in rats was 101.6%, with a smaller absorption rate (P < 0.05) and a smaller elimination rate (P < 0.1).
  
  
  CONCLUSIONS
  The nanoparticles (diamater < 100 nm) with relative high bioavailability were prepared using solvent-nonsolvent method. It is suitable for further study.
authors.affiliation: Department of Pharmaceutics, School of Pharmaceutical Sciences, Peking University, Beijing 100083, China.
authors.forename: Xue-qing
authors.initials: XQ
authors.lastname: Wang
authors.forename: Tao
authors.initials: T
authors.lastname: Zhang
authors.forename: Ying
authors.initials: Y
authors.lastname: He
authors.forename: Liang
authors.initials: L
authors.lastname: Zhang
authors.forename: Qiang
authors.initials: Q
authors.lastname: Zhang
mesh_terms: D000284:Administration, Oral; D000818:Animals; D001682:Biological Availability; D016572:Cyclosporine / Q000008:administration & dosage / Q000493:pharmacokinetics*; D003692:Delayed-Action Preparations; D007166:Immunosuppressive Agents / Q000008:administration & dosage / Q000493:pharmacokinetics*; D008297:Male; D036103:Nanotechnology; D011091:Polyesters; D011897:Random Allocation; D051381:Rats; D017208:Rats, Wistar
chemical_list: D003692:Delayed-Action Preparations; D007166:Immunosuppressive Agents; D011091:Polyesters; C033616:poly(lactide); D016572:Cyclosporine