Development of PLGA dry powder microparticles by supercritical CO2-assisted spray-drying for potential vaccine delivery to the lungs

Márcia Tavares, Renato P. Cabral, Clarinda Costa, Pedro Martins, Alexandra R. Fernandes, Teresa Casimiro, A. Aguiar-Ricardo

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


In this work, biocompatible and biodegradable poly(D-L-lactide-co-glycolide) (PLGA) composite microparticles with potential use as carrier for vaccines and other drugs to the lungs were developed using supercritical CO2-assisted spray-drying (SASD). Bovine serum albumin (BSA) was chosen as model vaccine, and L-leucine as a dispersibility enhancer, and their effects on the particle characteristics were evaluated. The dry powder formulations (DPFs) were characterized in terms of their morphology and aerodynamic performance using an in vitro aerosolization study – Andersen cascade impactor (ACI) − to obtain data such as the fine particle fraction (FPF) with percentages up to 43.4%, and the mass median aerodynamic diameter (MMAD) values between the 1.7 and 3.5 μm. Additionally, pharmacokinetic and cytotoxicity studies were performed confirming that the produced particles have all the necessary requirements for potential pulmonary delivery.

Original languageEnglish
Pages (from-to)235-243
Number of pages9
JournalJournal of Supercritical Fluids
Publication statusPublished - 1 Jan 2017


  • DOE
  • Dry powder inhalation
  • Poly(lactic-co-glycolic acid)
  • Pulmonary drug delivery
  • Supercritical assisted atomization

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