title: Direct detection and quantification of malondialdehyde vapour in humid air using selected ion flow tube mass spectrometry supported by gas chromatography/mass spectrometry.
abstract: BACKGROUND
  It has been proposed that malondialdehyde (MDA) reflects free oxygen-radical lipid peroxidation and can be useful as a biomarker to track this process. For the analysis of MDA molecules in humid air by selected ion flow tube mass spectrometry (SIFT-MS), the rate coefficients and the ion product distributions for the reactions of the SIFT-MS reagent ions with volatile MDA in the presence of water vapour are required.
  
  
  METHODS
  The SIFT technique has been used to determine the rate coefficients and ion product distributions for the reactions of H3O(+), NO(+) and O2 (+•) with gas-phase MDA. In support of the SIFT-MS analysis of MDA, solid-phase microextraction, SPME, coupled with gas chromatography/mass spectrometry, GC/MS, has been used to confirm the identification of MDA.
  
  
  RESULTS
  The primary product ions have been identified for the reactions of H3O(+), NO(+) and O2 (+•) with MDA and the formation of their hydrates formed in humid samples is described. The following combinations of reagent and the analyte ions (given as m/z values) have been adopted for SIFT-MS analyses of MDA in the gas phase: H3O(+): 109; NO(+): 89, 102; O2 (+•): 72, 90, 108, 126. The detection and quantification of MDA released by a cell culture by SIFT-MS are demonstrated.
  
  
  CONCLUSIONS
  This detailed study has provided the kinetics data required for the SIFT-MS analysis of MDA in humid air, including exhaled breath and the headspace of liquid-phase biogenic media. The detection and quantification by SIFT-MS of MDA released by a cell culture are demonstrated.
authors.affiliation: J. Heyrovsky Institute of Physical Chemistry of Science, Academy of Science of the Czech Republic, Dolejškova 3, 18223, Prague 8, Czech Republic.
authors.forename: Violetta
authors.initials: V
authors.lastname: Shestivska
authors.affiliation: Department of Surgery and Cancer, Imperial College London, St. Mary's Hospital, Praed Street, London, W2 1NY, UK.
authors.forename: Stefan S
authors.initials: SS
authors.lastname: Antonowicz
authors.affiliation: J. Heyrovsky Institute of Physical Chemistry of Science, Academy of Science of the Czech Republic, Dolejškova 3, 18223, Prague 8, Czech Republic.
authors.forename: Kseniya
authors.initials: K
authors.lastname: Dryahina
authors.affiliation: J. Heyrovsky Institute of Physical Chemistry of Science, Academy of Science of the Czech Republic, Dolejškova 3, 18223, Prague 8, Czech Republic.
authors.forename: Jiří
authors.initials: J
authors.lastname: Kubišta
authors.affiliation: Institute for Science and Technology in Medicine, School of Medicine, Keele University, Thornburrow Drive, Hartshill, Stoke-on-Trent, ST4 7QB, UK.
authors.forename: David
authors.initials: D
authors.lastname: Smith
authors.affiliation: J. Heyrovsky Institute of Physical Chemistry of Science, Academy of Science of the Czech Republic, Dolejškova 3, 18223, Prague 8, Czech Republic.|Institute for Science and Technology in Medicine, School of Medicine, Keele University, Thornburrow Drive, Hartshill, Stoke-on-Trent, ST4 7QB, UK.
authors.forename: Patrik
authors.initials: P
authors.lastname: Španěl
mesh_terms: D000388:Air / Q000032:analysis*; D045744:Cell Line, Tumor; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D006801:Humans; D006813:Humidity; D008315:Malondialdehyde / Q000737:chemistry*; D013058:Mass Spectrometry / Q000379:methods; D013227:Steam / Q000032:analysis
chemical_list: D013227:Steam; D008315:Malondialdehyde