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The Impact of Physico-chemical Properties of Extractable Compounds on Their Analytical Responses: An Evaluation of GC/MS Response Data

Published Date: February 16, 2024

In this on-demand webinar, our Scientific Advisor R&D, Dr. Jan Baeten,  discusses the impact of physico-chemical properties of extractable compounds on their analytical responses.

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In the last few years, the Analytical Chemistry approaches to characterize extracts of Medical Devices – In line with the new ISO 10993-18:2020 Standard – has grown considerably. Biocompatibility assessments, based on (experimental) Chemical Characterization of Medical Devices is now one of the standard approaches for a number of toxicological end points. However, one of the aspects that is under constant debate is how to make a non-targeted analysis – to detect and identify a broad set of compounds – sufficiently protective or quantitative allowing a subsequent reliable toxicological risk analysis.

While authorities indicate that a number of surrogate standards (eg 3 for GC/MS, 5 for LC/MS) should be used with varying retention times or functional groups to assist in the quantification of the detected extractables, no little or no guidance is given on the selection criteria on which surrogate to select to quantify a detected compound.

In a first step to address this issue, Nelson Labs has evaluated over 2700 compounds of which the analysis of authentic standards provided relative response values in GC/MS. GC/MS was selected as a first action as it is often a more standardized chromatographic and MS- method and it is considered as the “work horse” in E/L testing. Conclusions in GC/MS could also lead to guidance on how to optimize the orthogonal and complementary non-targeted analysis methodology (combining different techniques and detectors) it low responding GC/MS compounds could be well defined.

The database of over 2700 compounds was evaluated against a number of physico-chemical properties, such as boiling point, molecular weight, retention time, LogKow… While a lot of these parameters show some impact on the response of a compound, there is one parameter that stands out and would allow either a differentiated approach in the use of responses for compounds detected in GC/MS or it would allow selecting surrogate standards in a more scientific way.


This presentation, by Dr. Jan Baeten, was recorded during a live webinar hosted by Biopharma Asia in February 2024.


Jan Baeten

Jan Baeten received his Ph.D. from the faculty of Bioscience Engineering at the University of Leuven (Belgium) in 2012. After his academic career as a post-doctoral researcher, he joined Nelson Labs in 2015 as R&D scientist, focusing on innovations in analytical services for the pharmaceutical and medical device industries. Driven by his technical expertise in chromatography and mass spectrometry, Jan works on the development of new analytical solutions, strategies and data processing flows. In his role of technical advisor, he also gives support to business development. Jan is also active in the structure elucidation team working on identification of unknowns.

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