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Structure-Informed Comprehensive Screening and Risk Prioritization of Organophosphorus Compounds in Human Serum:

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Area of Science:

  • Environmental Chemistry
  • Toxicology
  • Analytical Chemistry

Background:

  • Organophosphorus compounds (OPCs) are widespread environmental contaminants with growing health concerns.
  • Human internal exposure to most OPCs, beyond a few organophosphate esters (OPEs), is not well understood.
  • A comprehensive understanding of the human exposome requires robust methods for identifying and quantifying diverse OPCs.

Purpose of the Study:

  • To develop and apply a novel framework for systematic characterization of internal OPC burden and risk in human serum.
  • To identify and semiquantify a broad spectrum of OPCs in human serum using advanced analytical techniques.
  • To prioritize OPCs based on integrated exposure and toxicological potential.

Main Methods:

  • Development of a structure-informed integrated screening and risk prioritization framework.
  • Utilized machine-learning-predicted retention times and response factors for enhanced identification.
  • Employed a cross-subgroup multidimensional weighted fragment-ion scoring system for semiquantification in complex matrices.
  • Analyzed serum samples from 254 residents.

Main Results:

  • Identified 59 OPCs in human serum, including 33 newly detected OPCs.
  • Revealed that emerging OPCs (organophosphonates, phosphine oxides, organothiophosphate esters) are the dominant exposure profile.
  • Coexposure network analysis showed OPCs often occur as interconnected mixtures.
  • Risk prioritization indicated several emerging OPCs have higher toxicological potential than typical OPEs.

Conclusions:

  • This study provides a significantly more comprehensive profile of the human internal OPC exposure landscape.
  • Emerging OPCs represent a critical component of current human exposure and potential health risks.
  • Future exposure assessment and risk management strategies must prioritize these emerging OPCs.