Gas chromatography/negative ion chemical ionization/tandem mass spectrometric quantification of indomethacin in plasma and synovial fluid.
A procedure for the quantification of sub-nanogram per millilitre concentrations of indomethacin in plasma and synovial fluid has been developed using gas chromatography/negative ion chemical ionization/tandem mass spectrometry. The procedure is based on selected ion monitoring of the daughter ion at m/z 312 generated following decarboxylation of the 35Cl isotope peak of the indomethacin anion (m/z 356) formed from the pentafluorobenzyl ester of indomethacin in the ion source of the mass spectrometer. The internal standard, d2-indomethacin, has a daughter ion at m/z 316 formed from the corresponding 37Cl isotope peak. The limit of quantification was 0.1 ng ml-1 for both plasma and synovial fluid.
Department of Rheumatology, Royal North Shore Hospital, St Leonards, NSW, Australia.
M
M
Dawson
M D
MD
Smith
C M
CM
McGee
D002713:Chlorine; D008401:Gas Chromatography-Mass Spectrometry; D006801:Humans; D007213:Indomethacin / Q000097:blood / Q000737:chemistry*; D011868:Radioisotopes; D013582:Synovial Fluid / Q000737:chemistry*
D011868:Radioisotopes; D002713:Chlorine; D007213:Indomethacin