Preparation of arsenic trioxide albumim microspheres and its release characteristicsin vitro

Summary Arsenic trioxide albumin microspheres (As₂O₃-BSA-NS) were prepared by using methods of chemical cross-linking. The desirability function (DF), calculated according to the size (<1μm) distribution, drug loading and drug trapping efficiency, was introduced as a total index for the microspheres formulation. Four factors, inculding W/O ratio, decentralization speed, BSA concentration and stirring stabilization time, were selected and arranged in an orthogonal experimental table. The release characteristic was studied by the drug release experimentin vitro. The four factors affected DF differently. Decentralization speed behaved as the maximum (P<0.01), followed by BSA concentration (P<0.05) and the W/O ratio dose (P<0.05). Stirring stabilization time did not influence DF (P>0.05). The release experimentin vitro showed that As₂O₃ in As₂O₃-BSA-NS was released more slower than pure As₂O₃. It was concluded that regular As₂O₃-BSA-NS may be prepared by the methods of chemical cross-linking, which was optimized by orthogonal experimental analysis of different factors, and the microspheres can release As₂O₃ slowly. ZHOU Jie, male, born in 1975, M.D., Ph.D. This project was supported by State Youth Natural Sciences Foundation (No. 30200284).