Microparticles produced by the hydrogel template method for sustained drug delivery

Area of Science:

• Materials Science
• Biomedical Engineering
• Pharmaceutical Sciences

Background:

• Polymeric microparticles are crucial for sustained drug delivery.
• Current production methods face challenges in homogeneity, drug loading, and burst release control.
• Improving microparticle characteristics is key for advanced therapeutic applications.

Purpose of the Study:

• To develop a hydrogel template method for producing homogeneous poly(lactide-co-glycolide) (PLGA) microparticles.
• To investigate formulation and process parameters affecting microparticle properties.
• To evaluate drug loading, encapsulation efficiency, and in vitro release profiles of model drugs.

Main Methods:

• Utilized a hydrogel template method with poly(vinyl alcohol) (PVA).
• Examined parameters including PVA molecular weight, PLGA type and concentration, drug concentration, and solvent system composition.
• Tested three model drugs: risperidone, methylprednisolone acetate, and paclitaxel.

Main Results:

• Microparticle conformity to the template depended on PVA molecular weight and PLGA solution viscosity.
• Drug loading and encapsulation efficiency were influenced by PLGA lactide content, polymer concentration, and solvent system.
• Achieved high drug loading (28.7-32.2%) and encapsulation efficiency (82-92%) for all model drugs.
• Demonstrated sustained drug release for weeks, with risperidone release comparable to conventional methods.

Conclusions:

• The hydrogel template method successfully produces homogeneous PLGA microparticles.
• This method offers control over critical microparticle attributes for drug delivery.
• It presents a promising new approach for manipulating microparticle characteristics in pharmaceutical formulations.