Tests for foreign particles in metered-dose aerosols.

Area of Science:

• Pharmaceutical Technology
• Aerosol Science
• Quality Control

Background:

• Accurate quantification of foreign particulate matter in metered-dose aerosols (MDAs) is crucial for patient safety and product efficacy.
• Existing methods for particulate matter determination in MDAs may lack sensitivity or comprehensive variation analysis.

Purpose of the Study:

• To develop and validate a simple, reliable method for determining foreign particulate matter in metered-dose aerosols.
• To compare the developed method with current pharmaceutical industry standards.
• To assess container-to-container variability in particulate matter content.

Main Methods:

• A novel, straightforward analytical procedure was established for foreign particulate matter identification in MDAs.
• The new method's performance was benchmarked against an established pharmaceutical industry protocol.
• Particle counts and sizes were analyzed to establish relationships and variations across different MDA containers.

Main Results:

• The developed method demonstrated favorable comparison with the existing pharmaceutical procedure.
• A linear correlation was observed between the logarithm of particle count and particle size across various MDAs.
• Significant product-to-product variations in particulate matter were noted.

Conclusions:

• The new method provides valuable insights into container-to-container variations, enhancing quality control for MDAs.
• Commercially available MDAs generally meet proposed limits for foreign particles (>100 micrometers), with specific statistical parameters outlined.
• This simple method supports robust quality assurance in pharmaceutical aerosol manufacturing.