[In vitro microstructural analysis of commercial ophthalmic suspensions by HRT II Rostock Cornea Module]

Area of Science:

• Ophthalmology
• Materials Science
• Pharmaceutical Sciences

Background:

• Commercially available ophthalmic suspensions are widely used in eye care.
• Understanding the microstructural properties of these suspensions is crucial for drug delivery and efficacy.
• Previous studies have established literature values for particle parameters in ophthalmic suspensions.

Purpose of the Study:

• To investigate the particle characteristics of commonly used ophthalmic suspensions.
• To compare these particle parameters with existing literature values.
• To evaluate the utility of the HRT II Rostock Cornea Module for microstructural analysis.

Main Methods:

• Software-aided analysis was performed on four ophthalmic suspensions: brinzolamide 1%, betaxolol HCl 0.25%, dexamethasone phosphate 0.1%, and prednisolone acetate 0.5%.
• Measurements included particle length, area, and circumference.
• Calculations of ellipticity and shape factor (SF) were conducted to assess particle morphology.

Main Results:

• Particle analysis revealed that the particles within these ophthalmic suspensions are not spherical.
• The shape factor (SF) and ellipticity varied among the different suspensions.
• Prednisolone acetate particles exhibited a significant tendency for aggregation.

Conclusions:

• The HRT II Rostock Cornea Module provides high-resolution imaging capabilities for in vitro microstructural examination.
• This technology allows for exact and reproducible analysis of ophthalmic suspension particles.
• The findings highlight the non-spherical nature of particles in common eye medications and potential aggregation issues.