Analysis of N(alpha)-methylhistamine by gas chromatography-mass spectrometry

J Chromatogr B Biomed Sci Appl. 2000 Mar 10;739(2):337-44. doi: 10.1016/s0378-4347(99)00569-1.


A gas chromatography-electron capture mass spectrometry assay has been developed for the histamine H3 receptor agonist, N(alpha)-methylhistamine (N(alpha)-MH). The assay is linear from 50 pg-10 ng, with a limit of detection of 50 pg/ml for gastric juice and plasma, and 50 pg/sample for bacteria (10(7)-10(8) CFU) and gastric tissue (5-10 mg wet weight). The limits of quantification are 100 pg/ml for gastric juice (%RSD=1.4) and plasma (%RSD=9.4), and 100 pg/sample for bacteria (%RSD=3.9) and tissue (%RSD=5.8). N(alpha)-MH was not present in human plasma, but low levels (1.4 ng/ml and 0.4 ng/ml) were detected in two samples of human gastric juice obtained from patients infected with Helicobacter pylori.

MeSH terms

  • Gas Chromatography-Mass Spectrometry / methods*
  • Gastric Juice / metabolism*
  • Helicobacter Infections / metabolism
  • Helicobacter Infections / microbiology
  • Helicobacter pylori / isolation & purification
  • Humans
  • Methylhistidines / blood
  • Methylhistidines / metabolism*
  • Sensitivity and Specificity


  • Methylhistidines