Solid lipid microparticles as a sustained release system for pulmonary drug delivery

Area of Science:

• Pharmaceutical Technology
• Drug Delivery Systems
• Nanotechnology

Background:

• Pulmonary drug delivery offers advantages but controlled release remains underexplored.
• Solid lipid microparticles (SLMs) present a promising alternative to liposomes and polymeric microspheres for drug carriers.
• Salbutamol acetonide (SA) was synthesized to enhance lipophilicity for improved incorporation into SLMs.

Purpose of the Study:

• To develop solid lipid microparticles (SLMs) for sustained pulmonary delivery of salbutamol acetonide (SA).
• To optimize manufacturing parameters for SLMs suitable for pulmonary administration.
• To characterize SA-loaded SLMs and evaluate their drug release profile.

Main Methods:

• Synthesis of salbutamol acetonide (SA) to increase lipophilicity.
• Production of SA-loaded SLMs using a hot emulsion technique and high-shear homogenization.
• Optimization of manufacturing parameters via experimental design methodology.
• Characterization using scanning electron microscopy (SEM) and X-ray diffraction (XRD).
• In vitro drug release studies.

Main Results:

• Optimized SLMs exhibited spherical morphology with a smooth surface.
• Salbutamol acetonide (SA) crystallized externally at drug loadings exceeding 20%, confirmed by XRD.
• In vitro release studies demonstrated that SA release rate increased with drug loading.
• Despite increased loading, SA release from SLMs remained slower than pure SA dissolution.

Conclusions:

• Solid lipid microparticles (SLMs) are effective carriers for achieving sustained pulmonary delivery of salbutamol acetonide (SA).
• The developed SLM formulation allows for controlled release, potentially improving therapeutic outcomes for respiratory conditions.
• Manufacturing parameters can be optimized to achieve desired particle characteristics for pulmonary administration.