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Ultrasensitive Direct Chemical Analysis of Human Hair Using Proton Transfer Reaction Time-of-Flight Mass Spectrometry

Anna C Neville1, David A Jarma1, Daniel C Blomdahl1

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Human hair analysis offers a novel way to measure pollution exposure. This method uses thermal extraction and mass spectrometry to detect semivolatile organic compounds, identifying exposure sources and health risks.

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Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Toxicology

Background:

  • Air pollution significantly impacts human health.
  • Current exposure measurement methods have limitations (outdoor focus, time-intensive, limited compound detection).
  • Human hair is proposed as a viable indicator for pollution exposure assessment.

Purpose of the Study:

  • To introduce a novel method for analyzing human hair to detect semivolatile organic compounds (SVOCs).
  • To establish human hair as a reliable biomarker for assessing pollution exposure and associated health risks.

Main Methods:

  • Developed a novel hair analysis technique using thermal extraction and Vocus 2R proton transfer reaction time-of-flight mass spectrometry (Vocus PTR-TOF-MS).
  • Analyzed hair samples subjected to a temperature ramp (60 °C, 90 °C, 120 °C).
  • Utilized hierarchical clustering for "clustergrams" and multivariate factor analysis to identify chemical fingerprints and exposure sources.

Main Results:

  • Successfully detected phthalates and their metabolites in human hair samples, confirming the method's ability to identify pollution biomarkers.
  • Demonstrated the capacity of the method to detect a wide spectrum of toxicologically relevant compounds.
  • Hierarchical clustering effectively grouped chemicals by similarity, aiding in the determination of potential exposure sources.

Conclusions:

  • The novel hair analysis method provides rapid and sensitive detection of SVOCs.
  • Human hair serves as a promising indicator for pollution exposure assessment.
  • This technique offers a valuable initial screening tool for measuring human exposure and evaluating health risks.