%0 Journal Article %A Arthur, Kayleigh %A Eiceman, Gary %A Reynolds, Jim %A Creaser, Colin %D 2016 %T Analysis of supramolecular complexes of 3-methylxanthine with field asymmetric waveform ion mobility spectrometry combined with mass spectrometry %U https://repository.lboro.ac.uk/articles/journal_contribution/Analysis_of_supramolecular_complexes_of_3-methylxanthine_with_field_asymmetric_waveform_ion_mobility_spectrometry_combined_with_mass_spectrometry/9391355 %2 https://repository.lboro.ac.uk/ndownloader/files/17004893 %K Field asymmetric waveform ion mobility spectrometry %K FAIMS %K Mass spectrometry %K Self-assembling complexes %K Dissociation %K In-source CID %K Charge state separation %K Chemical Sciences not elsewhere classified %X Miniaturised field asymmetric waveform ion mobility spectrometry (FAIMS), combined with mass spectrometry (MS), has been applied to the study of self-assembling, non-covalent supramolecular complexes of 3-methylxanthine (3-MX) in the gas phase. 3-MX forms stable tetrameric complexes around an alkali metal (Na+, K+) or ammonium cation, to generate a diverse array of complexes with single and multiple charge states. Complexes of (3-MX)n observed include: singly charged complexes where n = 1-8 and 12 and doubly charged complexes where n = 12-24. The most intense ions are those associated with multiples of tetrameric units, where n = 4, 8, 12, 16, 20, 24. The effect of dispersion field on the ion intensities of the self-assembled complexes indicates some fragmentation of higher order complexes within the FAIMS electrodes (in-FAIMS dissociation), as well as in-source collision induced dissociation within the mass spectrometer. FAIMS-MS enables charge state separation of supramolecular complexes of 3-MX and is shown to be capable of separating species with overlapping mass-to-charge ratios. FAIMS selected transmission also results in an improvement in signal-to-noise ratio for low intensity complexes and enables the visualisation of species undetectable without FAIMS. %I Loughborough University