Exposome-NL Lecture - Doug Walker

14 Feb 2022 | 16.00 - 17.00Online

Every second Monday of the month the Young Investigators Network invites a researcher from inside or outside the Exposome-NL consortium to inspire and inform the Exposome community, and to learn from each other. The sessions will be concluded with an interactive discussion. Join us on February 14th, when Doug Walker is our guest.


Establishing a systematic, untargeted framework for the human exposure by high-resolution mass spectrometry

Over a lifetime, humans experience thousands of chemical exposures from multiple sources. A more complete estimate of environmental exposures across the lifespan would be a transformative research initiative. The use of high-resolution, mass spectrometry (HRMS) provides a key platform for assessing the exposome and provides measures of thousands of chemical signals in a single human sample. Untargeted assays for the exposome primarily rely on strategies that were initially developed for metabolomic analysis, resulting in sample preparation, data acquisition and processing, and compound identification methods optimized for high-abundance metabolites. Therefore, current approaches have limited capability to capture many exposure biomarkers present in biological samples at concentrations orders of magnitude lower than endogenous metabolites and a critical need exists to optimize analytical procedures and data processing workflows for detection of exposome chemicals.

This presentation will discuss the limitations of using analytical frameworks primarily optimized for metabolomics analysis for measuring the exposome and highlight recent advances that include incorporating multiple untargeted analytical platforms, sample preparation techniques, data processing and annotation strategies that allow improved capture of exposure biomarkers in human samples. The use of enhanced exposome analytical frameworks based upon untargeted HRMS are poised to provide a robust foundation for exposome research and facilitate development of a knowledge base of environmental chemicals, their products, distributions and associated effects.

Practical matters

  • We start at exactly 16:00 hrs, so make sure you are on time!
  • If you encounter problems, try to copy the url and paste it into your browser. We advise you to use Firefox or Chrome as a browser.
  • Make sure your microphone is on mute, only opening it when it is your turn to speak. This way we avoid background noises during the lecture.
  • Feel free to ask questions using the chat functionality. After the lecture we will select and answer questions.

Should you have any further questions or will encounter any problems, please feel free to reach out to the Exposome Support Office.

Online link

Douglas Walker

Doug Walker
Assistant Professor
Environmental Medicine & Public Health
Mount Sinai,
New York, NY, USA

Decoding the exposome

Decoding the exposome

The environment we live in has a dominant impact on our health. It explains an estimated seventy percent of the chronic disease burden. Where we live, what we eat, how much we exercise, the air we breathe and whom we associate with; all of these environmental factors play a role. The combination of these factors over the life course is called the exposome. There is general (scientific) consensus that understanding more about the exposome will help explain the current burden of disease and that it provides entry points for prevention and ...

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