Electrospray ionization mass spectrometry of low-molecular-mass S-nitroso compounds and their thiols

J Chromatogr B Biomed Sci Appl. 2000 May 26;742(1):99-108. doi: 10.1016/s0378-4347(00)00141-9.

Abstract

Low-molecular-mass S-nitroso compounds (R-S-N=O) are potent vasodilators and inhibitors of platelet aggregation. This work describes the electrospray ionization mass spectrometric (ESI-MS) analysis of physiological and synthetic low-molecular-mass S-nitroso compounds and their thiols including S-nitrosoglutathione, S-nitrosocysteine, glutathione and cysteine. Mass spectra of the unlabeled and S-15N-labeled low-molecular-mass S-nitroso compounds investigated are characterized by abundant cations due to [M+H]+, [M+Na]+, [(M+H)-NO]+, [2 M+H]+, and [(2 M+H)-2NO]+. Mass spectra of low-molecular-mass thiols are characterized by abundant cations due to [M+H]+, [M+Na]+ and [2M+H]+. Using off-line electrospray ionization tandem mass spectrometry we unequivocally identified S-[15N]nitrosoglutathione in human red blood cells formed after their incubation with S-[15N]nitrosocysteine. These results suggest that ESI-MS in combination with an appropriate liquid chromatographic system should be a useful analytical approach for the on-line quantitative determination of low-molecular-mass S-nitroso compounds in biological fluids in the presence of their thiols and nitrite. Considerations were made about on-line ESI-MS and quantitative measurements.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Artifacts
  • Chromatography, High Pressure Liquid
  • Humans
  • Molecular Weight
  • Nitroso Compounds / analysis*
  • Nitroso Compounds / blood
  • Spectrometry, Mass, Electrospray Ionization / methods*
  • Sulfhydryl Compounds / analysis*
  • Sulfhydryl Compounds / blood

Substances

  • Nitroso Compounds
  • Sulfhydryl Compounds