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Endotoxin suitability testing: the foundation for reliable bacterial endotoxin test results
At ALS we support accurate endotoxin results with suitability testing. We verify bacterial endotoxin test performance for complex products, supporting regulatory compliance, reliable recovery, and GMP-quality data.
For reliable and accurate endotoxin results, it is essential to verify that the chosen method performs effectively for the specific product being tested. Endotoxin suitability testing, also known as the interfering factors test, demonstrates that the method can detect and quantify bacterial endotoxins accurately, even in the presence of product-specific inhibitors or enhancers.
At ALS, we perform endotoxin suitability testing in accordance with Ph. Eur. 2.6.14 and USP <85> Bacterial Endotoxins Test (BET), supporting precise and consistent results aligned with global regulatory expectations.
Why endotoxin suitability testing matters
Endotoxins are lipopolysaccharides found in the outer membrane of Gram-negative bacteria. Even at very low levels, they can trigger significant immune responses. Because endotoxins may remain present despite conventional sterilisation approaches, robust analytical control is essential during development, manufacturing and batch release.
Suitability testing reduces the risk of misleading results by confirming that the bacterial endotoxins test perform as intended for the product under realistic conditions. This supports accurate data generation and more confident quality decisions.
How our Sollentuna team works with you
We treat endotoxin suitability testing as a collaborative process tailored to your product, intended use and timelines.
Understanding your product and test context
We review your product matrix, intended BET method, target endotoxin limits and potential sources of interference.
Defining the suitability approach
We establish acceptance criteria and define how the suitability study will be performed, aligned with pharmacopoeia requirements and your internal quality needs.
Laboratory execution
Testing is performed in our GMP-compliant laboratory in Sollentuna, Sweden, with clear communication throughout the study.
Reporting and next steps
You receive a comprehensive, internally reviewed report with conclusions on method suitability and recommendations if optimisation is needed.
What we test and how we handle challenging products
What is an endotoxin suitability test?
An endotoxin suitability test is a recovery study in which a known amount of endotoxin is introduced into the product sample to verify that the method can accurately detect and quantify endotoxin in the presence of product-specific interfering factors.
Methods we use at ALS in Sollentuna
Depending on the product characteristics and regulatory requirements, we apply the appropriate bacterial endotoxin test approach, including:
- Gel-clot method: method A qualitative / Method B semi-quantitative
- Chromogenic kinetic method: method D quantitative.
Managing inhibition or enhancement
If product-specific inhibition or enhancement is observed, we evaluate suitable mitigation strategies, such as dilution or other scientifically justified adjustments aligned with pharmacopoeia expectations. This helps support accurate endotoxin recovery and reliable quantification
Quality, sustainability and a lifecycle mindset
ALS supports robust endotoxin method performance from early suitability work through routine testing. We continuously evaluate appropriate technological improvements and scientifically justified alternative approaches to strengthen long-term testing readiness without compromising analytical performance, data integrity or regulatory compliance.
Partner with ALS
Whether you need interfering factors testing before routine endotoxin analysis, support with pharmacopoeia-based bacterial endotoxin test methods, or help with challenging product matrices, ALS delivers reliable, regulatory-aligned and client-focused solutions.
Method development and validation: a clear path to reliable analytical results
At ALS, we provide reliable analytical methods across the full lifecycle for pharmaceutical, biotech and chemical industries, supporting your quality, compliance and decision-making journey through expert development, validation and transfer.
Microbiological suitability testing for bioburden: the foundation for reliable results
At ALS, we provide microbiological suitability testing to support reliable detection of viable microorganisms in complex or antimicrobial products, confirming methods are fit for purpose and compliant with global pharmacopoeial standards.
