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A high-specificity aniline-based mass tag for aldehyde detection.

Prisca Mungalachetty1, Pushkar Kulkarni1, Poguang Wang1

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A new reagent, N-{2-[(4-aminophenoxy)methyl]benzyl}-N,N-diethylethanaminium bromide (CAX-A), offers specific aldehyde detection. This method successfully identified putative aldehydes in urine samples with high sensitivity and specificity.

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Area of Science:

  • Analytical Chemistry
  • Biochemistry
  • Mass Spectrometry

Background:

  • Aldehydes are crucial biomarkers, but their detection is challenging.
  • The development of specific labeling reagents is essential for accurate aldehyde analysis.

Purpose of the Study:

  • To evaluate the efficacy of N-{2-[(4-aminophenoxy)methyl]benzyl}-N,N-diethylethanaminium bromide (CAX-A) as an aldehyde-labeling reagent.
  • To assess the specificity and sensitivity of CAX-A for aldehyde detection using liquid chromatography-electrospray ionization-Orbitrap mass spectrometry (LC-ESI-Orbitrap-MS).

Main Methods:

  • Six standard aldehydes were derivatized with CAX-A and sodium cyanoborohydride.
  • Derivatized aldehydes were analyzed using LC-ESI-Orbitrap-MS.
  • The CAX-A labeling reaction was applied to human urine samples for the detection of endogenous aldehydes.

Main Results:

  • CAX-A successfully labeled all six standard aldehydes, detectable at 830 fmol/injection with high signal-to-noise ratios (587-1573).
  • The reagent demonstrated high specificity, with significant peaks only for aldehydes when tested against ketones and quinones.
  • Fourteen putative aldehydes were identified in urine samples, with minimal background noise.

Conclusions:

  • CAX-A provides a highly specific and convenient method for aldehyde detection.
  • The reagent offers three levels of specificity, including characteristic MS2 and MS3 product ions.
  • CAX-A enables the sensitive and specific detection of putative aldehydes in complex biological matrices like urine.