Cellulose acetate microspheres prepared by o/w emulsification and solvent evaporation method

Area of Science:

• Materials Science
• Pharmaceutical Sciences
• Chemical Engineering

Background:

• Cellulose acetate microspheres are promising for drug delivery applications.
• Controlled release formulations require precise control over microsphere properties.
• Emulsification and solvent evaporation are key methods for microsphere fabrication.

Purpose of the Study:

• To develop and characterize cellulose acetate microspheres using the o/w emulsification and solvent evaporation method.
• To investigate the influence of process parameters on microsphere characteristics.
• To optimize the formulation for desired drug loading and release profiles.

Main Methods:

• Microsphere fabrication via oil-in-water (o/w) emulsification and solvent evaporation.
• Utilized polyvinyl alcohol as an emulsifying agent.
• Employed a 3^3 randomized full factorial design for parameter optimization.
• Analyzed particle size, drug loading capacity, and release kinetics.

Main Results:

• Achieved spherical microspheres with smooth surfaces and high encapsulation efficiencies (73-98%).
• Acetone in the oil phase significantly reduced particle size.
• Observed slow, non-Fickian drug release up to approximately 8 hours.
• Statistical analysis identified solvent composition and emulsifying agent concentration as key factors influencing drug release.

Conclusions:

• The developed cellulose acetate microspheres demonstrate potential for controlled drug delivery.
• Process parameters, particularly solvent composition and emulsifier concentration, significantly impact microsphere properties and drug release.
• Further optimization can tailor microsphere characteristics for specific pharmaceutical applications.