Spectral Transmission Requirements for Plastic Pharmaceutical Packaging in Accordance with USP <671>

Importance of the Topic

The integrity of plastic pharmaceutical packaging plays a critical role in protecting drug products from light-induced degradation and ensuring shelf-life stability. Regulatory standards such as USP <671> specify spectral transmission limits to guarantee that packaging offers adequate light protection.

Objectives and Study Overview

This application note demonstrates how to perform spectral transmission measurements on plastic containers used for oral liquid and solid dosage forms. The aim was to verify compliance with the USP <671> requirement that transmission does not exceed 10% between 290 and 450 nm using the Agilent Cary 3500 Flexible UV-Vis spectrophotometer.

Methodology and Used Instrumentation

The study employed the Agilent Cary 3500 Flexible UV-Vis spectrophotometer fitted with the solid-sample holder accessory kit (G9854A). Key methodological details include:

• Sample preparation: Cutting specimens from three regions of each container and mounting them on a 5 mm aperture without additional tools.
• Measurement parameters: Wavelength range 290–450 nm, spectral bandwidth 2 nm, baseline set to air, using the Y Max function for automatic detection of maximum transmission.
• Instrument features: Double-beam design, xenon flash lamp with a 10-year warranty, large sample compartment, solid and thin-film holder options.
• Software: Cary UV Workstation version 1.4 for data acquisition, automated end-of-sequence analysis, and compatibility with Agilent OpenLab for regulatory compliance.

Main Results and Discussion

All measured plastic containers exhibited maximum transmission values below the 10% threshold across the 290–450 nm range, meeting the USP <671> criteria. The automated Y Max function and the Results and Analysis page streamlined data interpretation by providing transmission spectra and tabulated maximum values immediately after acquisition.

Benefits and Practical Applications

• Fast and reliable compliance testing for light-resistant packaging.
• High throughput through automated data analysis and customizable methods.
• Enhanced data integrity and regulatory alignment via OpenLab integration.
• Flexible accessory kit accommodates diverse sample geometries.

Future Trends and Potential Applications

Anticipated updates include adoption of USP <661.2> for plastic packaging systems, expanded automation in sample handling, integration with advanced data analytics, and application to a wider range of pharmaceutical and nutraceutical containers.

Conclusion

The Agilent Cary 3500 Flexible UV-Vis spectrophotometer with solid-sample holder provides a robust, user-friendly solution for verifying spectral transmission of plastic pharmaceutical packaging in accordance with USP <671>. Its advanced hardware, versatile accessories, and integrated software deliver accurate, compliant, and efficient light transmission measurements.

References

• United States Pharmacopeia General Chapter <671>, Containers–Performance Testing.
• United States Pharmacopeia General Chapter <659>, Packaging and Storage Requirements.
• United States Pharmacopeia General Chapter <661>, Plastic Packaging Systems and their Materials of Construction.
• United States Pharmacopeia General Chapter <661.1>, Plastic Materials of Construction.
• United States Pharmacopeia General Chapter <661.2>, Plastic Packaging Systems for Pharmaceutical Use.