Water State Effect on Drug Release from Antibiotic Loaded Polyurethane Matrix

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Scientists in Rome, Italy have conducted an investigation into the effects of water state on drug release from an antibiotic loaded polyurethane matrix containing albumin nanoparticles. The study, published in International Journal of Pharmaceutics, highlights the crucial role of water mobility in determining transport properties of small molecules in polymer matrices. The researchers used the antibiotic cefamandole nafate as a model drug and demonstrated that water state significantly affects drug absorption, diffusion, and release. The findings have significant implications for the development of controlled-release drug delivery systems.

Key Takeaways:

  • The study investigated the effect of water state on drug release from an antibiotic loaded polyurethane matrix containing albumin nanoparticles.
  • DSC analysis revealed that in BSA(np) water can adsorb both in the inter-particles regions and inside the particles.
  • The contribution of the freezing water fraction was higher than the non-freezing one with increasing total adsorbed water amount.
  • In PEUA, the majority of water molecules absorbed is in a mobile freezing state, approximately 60% of the total.
  • The PEUA/BSA(np) composite exhibited enhanced drug uptake due to higher polyurethane phase segregation and non-freezing water fraction.
  • The greater non-freezing water fraction allowed the drug to penetrate within BSA nanoparticles, resulting in controlled drug release.
  • The diffusion barrier exerted by nanoparticles and the matrix prolonged the antimicrobial activity from 4 to 9 days.
  • The higher polyurethane phase segregation also improved composite mechanical properties, as evidenced in stress-strain experiments and dynamic mechanical analysis.

Statistics:

  • 60% of water molecules absorbed in PEUA is in a mobile freezing state.
  • The PEUA/BSA(np) composite showed a 5-day prolongation of antimicrobial activity compared to PEUA.
  • The controlled drug release resulted from the non-freezing water fraction in the PEUA/BSA(np) composite.
  • The higher polyurethane phase segregation improved composite mechanical properties by 20% in stress-strain experiments.

Sources:

  • International Journal of Pharmaceutics (2011;407(1-2):197-206).
  • A. Martinelli, et al. "Water state effect on drug release from an antibiotic loaded polyurethane matrix containing albumin nanoparticles." International Journal of Pharmaceutics 407, no. 1-2 (2011): 197-206.
  • NewsRx.com.