BioPhorum Extractables Test Report An Overview

What Are Extractables?

Extractables are chemical substances that migrate from a material or component when it is exposed to a solvent under exaggerated conditions (elevated temperature, aggressive solvent, prolonged contact). They represent the worstcase chemical profile of a product in contact with the material and are the basis for safety assessment of pharmaceuticals, biologics, and medical devices.

Why the BioPhorum Extractables Test?

The BioPhorum Extractables Working Group (BEWG) was created to harmonise testing approaches across the biopharma industry. Its test protocol sets out a common set of solvents, temperatures, and times, allowing companies to compare results, share data, and build a robust extractables database.

Benefits of using the BioPhorum protocol include:

• Standardised methodology reduces variability between suppliers.
• Regulatory alignment many agencies recognise the BEWG approach.
• Riskbased decision making helps prioritize leachables testing.
• Accelerated material qualification data can be leveraged across programmes.

Core Elements of the Test

Materials and Components

The protocol applies to containers, closures, tubing, filters, and any polymerbased component that will be in direct contact with drug product or process intermediates.

Solvent Selection

The following solvents are recommended, each representing a different polarity range:

Test Conditions

• Temperature: 40C for waterbased solvents; 50C for organic solvents.
• Duration: 72hours (minimum) to achieve equilibrium.
• SurfacetoVolume Ratio: 1cm of material per 5mL of solvent (or as specified for the component).

Analytical Techniques

A typical BEWG report combines several orthogonal methods to capture a broad chemical space:

• GCMS (Gas Chromatography Mass Spectrometry) for volatile and semivolatile organics.
• LCMS/MS (Liquid Chromatography Tandem MS) for nonvolatile, polar, and highmolecularweight compounds.
• GCFID (Flame Ionisation Detector) for quantifying total organic carbon.
• ICPMS (Inductively Coupled Plasma MS) for elemental leachables (e.g., metals, halides).
• NMR (Nuclear Magnetic Resonance) for structural elucidation of unknowns.

Structure of a BioPhorum Extractables Report

A typical report contains the following sections:

1. Executive Summary concise overview of findings and risk implications.
2. Scope & Materials description of the component, manufacturing lot, and test matrix.
3. Methodology detailed test conditions, solvent list, and analytical parameters.
4. Results
   • Tabulated concentration data (g/g or ppm) for each identified compound.
   • Peakarea charts and representative chromatograms.
   • Identification confidence levels (e.g., confirmed, probable, tentative).
5. Discussion interpretation of results, comparison with historical data, and assessment of potential leachable risk.
6. Conclusions & Recommendations whether the material is suitable, need for additional leachables testing, or mitigation actions (e.g., preconditioning).
7. Appendices raw data files, detailed instrument settings, and reference standards used.

Interpreting the Data

Not every extractable is automatically a safety concern. The following framework helps determine relevance:

• Concentration Thresholds compare against the ICH Q3D limits for elemental impurities and the USPImpurities limits for organic compounds.
• Toxicological Evaluation use available safety data (e.g., TOXNET, ECHA) to assess carcinogenicity, genotoxicity, or organ toxicity.
• Process Relevance if the solvent used in the extractables test is not part of the intended manufacturing process, exposure may be lower.
• Potential for Leaching compounds that are highly volatile or soluble in the actual product medium pose higher leachable risk.

Benefits of a Shared Database

By contributing data to the BioPhorum Extractables Database, companies gain:

• Benchmarking against peergenerated extractables profiles.
• Reduced need for duplicate testing on common materials.
• Faster regulatory submissions reviewers can reference alreadypublished data.

Participation is voluntary, but the industry trend is moving toward open data exchange to improve overall product safety and accelerate development timelines.

Key Takeaways

• The BioPhorum extractables protocol provides a consistent, riskfocused approach for evaluating material compatibility with biopharmaceutical products.
• Standardised solvents, temperatures, and analytical methods make results comparable across suppliers.
• Interpretation requires a blend of quantitative thresholds, toxicological insight, and knowledge of the actual product formulation.
• Sharing results in the BEWG database amplifies the value of each test, helping the whole industry achieve safer, faster product launches.

Further Reading & Resources

• BioPhorum Extractables Working Group Official Site
• ICH Q3D(R1) Guidance on Elemental Impurities
• USP General Chapter ²¹² Impurities
• FDA Guidance: Drug Products Content and Purity