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Original Articles

In situ forming poly(lactic acid-co-glycolic acid) implants containing leuprolide acetate/β-cyclodextrin complexes: preparation, characterization, and in vitro drug release

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Pages 75-84 | Received 18 Mar 2015, Accepted 02 May 2015, Published online: 14 Oct 2015
 

ABSTRACT

In situ forming implants (ISIs) based on poly(lactic acid-co-glycolic acid) (PLGA) containing leuprolide acetate/β-cyclodextrin (LA/β-CD) complexes were prepared. Incorporation of LA or complexes did not change Tg values of ISIs (48.4–49.6°C). ISIs containing complexes with more β-CD content showed higher surface and bulk porosity. Higher β-CD portion in complexes improved solvent release, decreased initial burst release and facilitated diffusion out of drug for corresponding ISIs. Complexation of LA with β-CD (1/10, w/w) significantly improved its stability within PLGA matrix before release (total LA release of 91.3%). ISIs did not show any cellular cytotoxic effects against L929 fibroblast cells.

GRAPHICAL ABSTRACT

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