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Progress towards the characterisation of faecal compounds.

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Intestinal nitrosation forms N-nitroso compounds linked to colon cancer risk. A new method using labeled nitrite and mass spectrometry efficiently identifies these compounds in fecal and ileostomy samples.

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Area of Science:

  • Analytical Chemistry
  • Gastroenterology
  • Cancer Research

Background:

  • Intestinal nitrosation generates Apparent Total N-nitroso Compounds (ATNCs), associated with increased colon cancer risk, particularly from red meat consumption.
  • Modern Liquid Chromatography-Mass Spectrometry (LC-MS) enables direct detection of ATNC components in biological samples like fecal water.
  • Identifying specific N-nitrosamines among numerous compounds in complex matrices is a significant analytical challenge.

Purpose of the Study:

  • To develop a novel and practical method for identifying unknown N-nitrosamines in fecal and ileostomy samples.
  • To leverage advanced LC-MS techniques combined with stable isotope labeling for enhanced N-nitrosamine detection.
  • To investigate the in vivo formation and detection of N-nitroso compounds relevant to gastrointestinal health and disease.

Main Methods:

  • Further nitrosation of fecal and ileostomy fluids to increase ATNC concentration.
  • Derivatization of samples using both 14N and 15N labeled nitrite.
  • Parallel analysis of chromatograms to detect mass differences indicative of N-nitrosamines.
  • Integration of MS with traditional methods like Thermal Energy Analyzer (TEA) and UV irradiation degradation.

Main Results:

  • A repeatable method for identifying unknown ATNCs in human biological samples was established.
  • The approach successfully identified 30 putative N-nitroso compounds based on characteristic mass differences.
  • The study demonstrated the utility of stable isotope labeling in N-nitrosamine discovery.

Conclusions:

  • The developed method provides a novel and practicable means for identifying N-nitrosamines in complex biological matrices.
  • This technique aids in understanding the role of N-nitroso compounds in gastrointestinal health and disease.
  • The findings contribute to the analytical toolkit for investigating diet-related cancer risks.