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MALDI-TOF Mass Spectrometry01:19

MALDI-TOF Mass Spectrometry

Mass spectrometry is a powerful characterization technique that can identify and separate a wide variety of compounds ranging from chemical to biological entities, based on their mass-to-charge ratio (m/z). The instruments that allow this detection, known as mass spectrometers, have three components: an ion source, a mass analyzer, and a detector. These spectrometers differ based on the nature of their ion source and analyzers.Matrix-assisted laser desorption ionization (MALDI) is a commonly...

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Identification, Organic Synthesis, and Sensitive Analysis of a cis-Homosalate-Specific Exposure Biomarker.

Katharina E Ebert1, Vladimir N Belov2, Michael John3

  • 1Institute for Prevention and Occupational Medicine of the German Social Accident Insurance, Institute of the Ruhr University Bochum (IPA), Bürkle-de-la-Camp-Platz 1, 44789 Bochum, Germany.

Chemical Research in Toxicology
|January 16, 2024
PubMed
Summary

Researchers identified a new biomarker, HMS-CA 5, specific to cis-homosalate (cis-HMS) exposure. This advancement allows for sensitive, separate monitoring of cis- and trans-homosalate isomers in human biomonitoring studies.

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Area of Science:

  • Environmental Chemistry
  • Toxicology
  • Analytical Chemistry

Background:

  • Homosalate (HMS) is a widely used organic UV filter in sunscreens and personal care products.
  • Human exposure to HMS is not well understood, and its cis- and trans-isomers exhibit different toxicokinetics.
  • Previous research identified potential biomarkers but lacked a sensitive marker for cis-HMS.

Purpose of the Study:

  • To synthesize and identify HMS carboxylic acid (HMS-CA) isomers, specifically a cis-HMS-specific metabolite.
  • To develop a sensitive analytical method for monitoring cis- and trans-HMS isomers in human urine.
  • To enable separate assessment of cis- and trans-HMS exposure for risk evaluation.

Main Methods:

  • Synthesis of three HMS-CA isomers, including the elucidation of HMS-CA 5's constitution and configuration.
  • Integration of the identified cis-HMS-specific metabolite (HMS-CA 5) into a human biomonitoring LC-MS/MS method.
  • Validation of the enhanced method for precision, recovery, and limit of quantification in urine samples.

Main Results:

  • Successfully synthesized and identified three HMS-CA isomers, confirming HMS-CA 5 as a cis-HMS-specific metabolite.
  • The validated LC-MS/MS method demonstrated high precision (CV < 2% intra-day, < 5% inter-day) and mean recovery of 96%.
  • The method achieved a low limit of quantification (0.02 μg L⁻¹) for HMS-CA 5, allowing detection for up to 96 hours post-application.

Conclusions:

  • The study successfully identified and characterized all five HMS-CA isomers found in human metabolism.
  • The developed biomonitoring method enables sensitive and separate quantification of cis- and trans-HMS metabolites.
  • This advancement is crucial for accurate human exposure and risk assessment of individual HMS isomers.