Spectral Transmission Measurements of Pharmaceutical Packaging

Significance of the topic

Pharmaceutical packaging must protect light sensitive drugs from photodegradation. Regulatory standards in the European Pharmacopeia and United States Pharmacopeia require demonstration of light resistance to ensure product stability and safety. Accurate measurement of spectral transmission of packaging materials is essential for quality assurance and regulatory compliance.

Objectives and study overview

This study evaluates the spectral transmission of one glass amber container and two plastic containers yellow opaque and amber translucent intended for oral pharmaceuticals. Measurements follow EP 3.2.1 USP 660 and USP 661.2 compendial methods to verify that transmitted light does not exceed the 10 percent threshold between 290 and 450 nanometers.

Methodology and instrumentation

Sample sections of uniform thickness were cut from each container cleaned and mounted at the 6 millimeter aperture of the integrating sphere accessory. Baseline spectra were collected with air in the sample compartment. Transmission spectra were recorded over 290 to 450 nanometers with 1.5 nanometer bandwidth 1 nanometer data intervals and 0.1 second integration time. All scattered light was captured by the 50 millimeter PTFE coated integrating sphere to ensure accurate total transmittance readings.

Used instrumentation

• Agilent Cary 60 UV Vis spectrophotometer
• Agilent Cary 60 UV Vis diffuse reflectance accessory
• Agilent Cary WinUV data acquisition software

Main results and discussion

All three packaging samples exhibited maximum transmission values below the 10 percent limit:

• Glass amber container 1.121 percent
• Plastic yellow opaque container 0.155 percent
• Plastic amber translucent container 9.570 percent

This confirms compliance with EP 3.2.1 USP 660 and USP 661.2 requirements. The integrating sphere accessory effectively compensated for light scattering enabling reliable measurement of textured and translucent materials.

Benefits and practical applications

• Ensures regulatory compliance for light sensitive pharmaceuticals
• Enables accurate total transmission measurement of scattering materials
• Offers rapid plug and play setup for routine quality control

Future trends and possibilities

• Integration of real time monitoring in packaging production lines
• Miniaturization of spectrophotometric accessories for in situ testing
• Advanced data analysis with machine learning for predictive quality assessment

Conclusion

The Agilent Cary 60 UV Vis spectrophotometer with integrating sphere accessory provides a robust and compliant solution for assessing light resistance of pharmaceutical containers. The methodology delivers accurate and reproducible transmission data ensuring that packaging meets stringent pharmacopeial standards.

References

1. Kowalska J Rok J Rzepka Z Wrzęsniok D Drug Induced Photosensitivity From Light and Chemistry to Biological Reactions and Clinical Symptoms Pharmaceuticals 2021 14 8 723 doi 10 3390 ph14080723
2. European Pharmacopeia Glass containers for pharmaceutical use Chapter 3 2 1 Council of Europe 2019
3. United States Pharmacopeia National Formulary General Chapter 660 Containers Glass USP 40 NF 35
4. United States Pharmacopeia National Formulary General Chapter 661.2 Plastic Packaging Systems for Pharmaceutical Use USP 42 NF 37
5. United States Pharmacopeia National Formulary General Chapter 671 Containers Performance Testing USP 42 NF 37
6. Agilent Technologies Cary 60 UV Vis Spectrophotometer and Cary WinUV Software Application Note