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Related Experiment Videos

Basic profiles of organic acids in urine.

H M Liebich1, C Först

  • 1Medizinische Universitätsklinik, Tübingen, F.R.G.

Journal of Chromatography
|January 26, 1990
PubMed
Summary

Researchers identified 143 organic acids in urine using gas chromatography-mass spectrometry. This comprehensive analysis provides a detailed chemical profile of urinary organic acids in healthy individuals.

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Area of Science:

  • Analytical Chemistry
  • Biochemistry
  • Metabolomics

Background:

  • Urinary organic acids are key biomarkers for metabolic health.
  • Comprehensive profiling of these acids is crucial for understanding physiological and pathological states.
  • Previous methods faced challenges in separating and identifying the complex mixture of urinary organic acids.

Purpose of the Study:

  • To comprehensively identify and characterize organic acids in human urine.
  • To establish a reproducible method for the qualitative analysis of urinary organic acids.
  • To classify identified organic acids into distinct chemical groups.

Main Methods:

  • Gas chromatography-mass spectrometry (GC-MS) was employed for the identification of organic acids.
  • Organic acids were converted to methyl esters for enhanced volatility and detection.
  • Pre-fractionation techniques were utilized to minimize peak overlap in the complex urinary mixture.
  • Separation was performed on OV-1701 capillary columns, utilizing methylene units for identification.

Main Results:

  • A total of 143 distinct organic acids were identified in the urine of healthy individuals.
  • The identified acids were classified into seven categories: dicarboxylic acids, oxocarboxylic acids, hydroxycarboxylic acids, aromatic acids, furancarboxylic acids, nitrogen-containing acids, and acid conjugates.
  • Pre-fractionation significantly improved the detection and identification of low-concentration substances.
  • Qualitative patterns of urinary organic acids were found to be constant and reproducible.
  • Reliable identification of many organic acids was achievable by GC alone.

Conclusions:

  • The study successfully identified a comprehensive set of 143 organic acids in healthy human urine.
  • The developed GC-MS method, including pre-fractionation, is effective for detailed urinary organic acid profiling.
  • The consistent qualitative patterns suggest the potential for using urinary organic acid profiles as diagnostic or monitoring tools.

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