Ciclosporin-loaded poly(lactide) microparticles: Effect of TPGS

Authors: Yeung, Eni¹; Chaw, Cheng Shu²

Source: Journal of Microencapsulation, Volume 26, Number 1, February 2009 , pp. 9-17(9)

Buy & download fulltext article:

Price: $34.29 plus tax (Refund Policy)

Abstract:

The properties of spray dried PLA microparticles were affected by the choice of solvents, amount of ciclosporin and TPGS added. Ethyl acetate formed microparticle with smooth surface when compared to those produced by dichloromethane. The results of FTIR have not shown chemical interaction amongst PLA, ciclosporin and TPGS while thermal analysis showed physical interactions amongst these components. TPGS was found to lower Tg value of PLA by exerting a plasticizing effect while ciclosporin reverted this effect. When the content of TPGS increased from 2% (w/w) to 10% (w/w), the microparticles tended to agglomerate due to the lowering of the polymer Tg values at the employed spray drying temperature. In addition, a lesser amount of ciclosporin was found at the surface of the microparticle and resulted in smaller initial release of ciclosporin. When 2% (w/w) TPGS was used, the initial release of ciclosporin was enhanced and the microparticles formed were not agglomerated.

Keywords: Ciclosporin; PLA; glass transition temperature; microparticles; spray drying; TPGS

Document Type: Research article

DOI: http://dx.doi.org/10.1080/02652040802094402

Affiliations: 1: Institute of Materials Research & Engineering, Singapore 2: Institute of Materials Research & Engineering, Singapore,School of Health, Natural and Social Sciences, University of Sunderland, Sunderland, UK

Publication date: 2009-02-01

More about this publication?