Analysis of Extractables from Pharmaceutical Packaging Materials by Solvent Extraction-GC-MS and Headspace-GC-MS

Importance of the Topic

Ensuring that pharmaceutical packaging does not impart harmful compounds to drug products is vital for patient safety and regulatory compliance. Extractables and leachables pose potential risks that must be quantified and characterized to assess packaging material suitability, especially as biopharmaceuticals and single-use systems become more prevalent.

Objectives and Study Overview

This study evaluated complementary GC-MS approaches for profiling volatile and semi-volatile extractables from polyvinyl chloride (PVC) liquid formulation bags. Two strategies were compared: solvent extraction with liquid injection GC-MS and high-temperature headspace GC-MS, with emphasis on extraction efficiency, compound coverage, and identification accuracy.

Methodology and Instrumentation

Sample preparation involved cutting PVC bags into 1 cm squares. Solvent extraction employed dichloromethane, hexane, and ethanol, using ultrasonic agitation for 5 h followed by 3 days of static immersion. High-temperature extraction utilized a headspace sampler at vial temperatures from 80 °C to 250 °C without solvents. Analytical conditions were standardized on a GCMS-QP2020 NX with an SH-I-5MS (30 m × 0.25 mm I.D., 0.25 µm) column. Compound identification leveraged both the NIST library and a specialized Polymer Additives Library to capture additives and their degradation products.

Used Instrumentation

• GCMS-QP2020 NX gas chromatograph–mass spectrometer
• AOC-20i/s liquid autosampler
• HS-20 headspace sampler
• SH-I-5MS capillary column (30 m × 0.25 mm I.D., 0.25 µm film thickness)

Key Results and Discussion

Solvent polarity influenced extractable profiles: hexane and dichloromethane effectively recovered non-polar plasticizers (DEHA, DEHP, TOTM) and lubricants, while ethanol yielded additional polar compounds such as 2-ethylhexanol and epoxidized fatty esters. High-temperature headspace at 250 °C generated the most comprehensive extractable profile, including volatile solvents, plasticizers, lubricants, PVC degradation products, and thermal decomposition fragments. The Polymer Additives Library enhanced qualitative analysis by matching both parent additives and their degradation products, outperforming general libraries in specificity and confidence.

Benefits and Practical Applications of the Method

• Broad analyte coverage across a wide polarity range through combined solvent and headspace extraction.
• Minimal sample preparation and no solvent use for headspace-GC-MS, accelerating throughput.
• Improved identification accuracy using a targeted Polymer Additives Library capable of detecting degradation products.
• Efficient screening workflow suitable for regulatory extractables and leachables assessments in pharmaceutical packaging QA/QC.

Future Trends and Applications

With regulatory frameworks like ICH-Q3E driving more stringent extractables and leachables evaluations, future developments may include integration of high-resolution mass spectrometry, automated spectral deconvolution, real-time monitoring of single-use systems, and expanded dedicated spectral databases. These advances will facilitate faster method development, deeper risk assessments, and broader adoption in biologics and complex formulations.

Conclusion

Combining solvent extraction and high-temperature headspace GC-MS, supported by specialized spectral libraries, delivers a powerful and versatile strategy for identifying extractables in pharmaceutical packaging. This dual approach provides comprehensive analyte coverage, streamlined workflows, and high-confidence compound identification, addressing critical industry needs for safety and compliance evaluation.