title: Analysis of N(alpha)-methylhistamine by gas chromatography-mass spectrometry.
abstract: 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.
authors.affiliation: Division of Medicine, Imperial College School of Medicine, London, UK.
authors.forename: S
authors.initials: S
authors.lastname: Murray
authors.forename: P
authors.initials: P
authors.lastname: Bliss
authors.forename: N
authors.initials: N
authors.lastname: Karim
authors.forename: J
authors.initials: J
authors.lastname: Calam
authors.forename: G W
authors.initials: GW
authors.lastname: Taylor
mesh_terms: D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D005750:Gastric Juice / Q000378:metabolism*; D016481:Helicobacter Infections / Q000378:metabolism / Q000382:microbiology; D016480:Helicobacter pylori / Q000302:isolation & purification; D006801:Humans; D008762:Methylhistidines / Q000097:blood / Q000378:metabolism*; D012680:Sensitivity and Specificity
chemical_list: D008762:Methylhistidines