Urinary Excretion of N1-Menthyl-2-Pyridone-5-Carboxylic Acid and the Fate of remaining of Trigonellie

  • S. Yuyama
  • Y. Kawano
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 398)


During the development of a procedure for the determination of trigonelline (Tg) in human urine, an organic acid with a similar ultraviolet spectrum was isolated. The compound was found to be N1-methyl-2-pyridone-5-carboxylic acid (Tg-2Py) (Lindenblad et al. 1956), which Holman et al. (1950) were unable to detected in normal human urine. Tg-2Py was determined by using high performance thin-layer chromatography (HPTLC), and the level of Tg-2Py excretion was about 1.5 times of Tg or N1-methylnicotinamide(MNA) in 9 normal human urine (Yuyama et al, 1991). When Tg was orally administered in 3 human subjects, only 20% of the dose recovered in 24hr urine as unchanged Tg, and about 10% of the dose was converted into Tg-2Py (Yuyama et al. 1991). To explain the fate of missing Tg (60–70%),the possible mechanism for metabolism of Tg are as follows; 1) Tg may be metabolized further, expect Tg-2Py, 2) the ring fission could occur to pyridinium compounds, 3) Tg may be retained in the organ(s).


Urinary Excretion Nicotinic Acid Human Urine Infrared Absorption Spectrum Aluminium Oxide Column 
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Copyright information

© Plenum Press, New York 1996

Authors and Affiliations

  • S. Yuyama
    • 1
  • Y. Kawano
    • 1
  1. 1.Department of Nutrition and BiochemistyThe Institute of Public Health TokyoJapan

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