Optimization of metronidazole sustained-release films using D-optimal design

Area of Science:

• Pharmaceutical Sciences
• Materials Science

Background:

• Periodontal disease treatment often requires sustained drug delivery to maintain therapeutic concentrations.
• Metronidazole is a key antibiotic for treating anaerobic bacterial infections in periodontal pockets.
• Developing effective drug delivery systems is crucial for improving treatment outcomes and patient compliance.

Purpose of the Study:

• To develop sustained-release metronidazole films for periodontal pockets.
• To utilize a computer-aided statistical approach (D-optimal design) for formulation optimization.
• To characterize the physicochemical properties and drug release profiles of the developed films.

Main Methods:

• Utilized a melt method to prepare metronidazole films incorporating polycaprolactone, hydroxypropylmethyl cellulose, and glyceryl monostearate.
• Employed a D-optimal statistical design to study the effects of independent variables on metronidazole release.
• Investigated physicochemical properties including film weight, drug loading, thickness, puncture strength, % elongation, and Young's modulus.
• Evaluated metronidazole release profiles over five days and determined the release mechanism.

Main Results:

• The developed films were thin, white sheets with smooth surfaces and uniform metronidazole dispersion (100.12 ± 4.38% drug loading).
• Physicochemical analysis showed acceptable mechanical properties (puncture strength, % elongation, Young's modulus).
• The optimized films exhibited slow metronidazole release over 5 days, consistent with Fickian diffusion, and actual release closely matched predicted values.

Conclusions:

• Computer-aided D-optimal design is effective for developing sustained-release metronidazole films for periodontal applications.
• The optimized films offer a promising approach for localized, long-term metronidazole delivery in periodontal pockets.
• Further validation and in vivo studies are warranted to confirm the clinical efficacy of these sustained-release films.