title: Dissociation of biomolecules using a ultraviolet matrix-assisted laser desorption/ionisation time-of-flight/curved field reflectron tandem mass spectrometer equipped with a differential-pumped collision cell.
abstract: A commercial matrix-assisted laser desorption/ionisation time-of-flight (MALDI-ToF) instrument equipped with a curved field reflectron (CFR) was modified in order to perform collision-induced dissociation (CID) on a variety of biomolecules. The incorporation of a high-resolution ion gate together with a collision cell within the field-free region allowed tandem mass analysis (MS/MS), without the necessity to decelerate the precursor ions prior to activation. The simultaneous detection of all product ions remained possible by using the CFR. To test the MS/MS performances, ACTH (fragment 1-17), a complex high mannose carbohydrate (Man)(8)(GlcNac)(2) and a lysophosphatidylcholine lipid (18:1) were analysed on the modified instrument. Direct comparison with the low-energy product ion spectra, acquired on a MALDI quadrupole ion trap (QIT) two-stage reflectron time-of flight (ReToF) mass spectrometer, showed significant differences in the types of product ions observed. The additional ions detected were a clear indication of the high-energy fragmentation processes occurring in the collision cell.
authors.affiliation: Shimadzu Biotech, Wharfside, Trafford Wharf Road, Manchester M17 1GP, UK. Omar.Belacem@kratos.co.uk
authors.forename: Omar
authors.initials: O
authors.lastname: Belgacem
authors.forename: Andrew
authors.initials: A
authors.lastname: Bowdler
authors.forename: Ian
authors.initials: I
authors.lastname: Brookhouse
authors.forename: Francesco L
authors.initials: FL
authors.lastname: Brancia
authors.forename: Emmanuel
authors.initials: E
authors.lastname: Raptakis
mesh_terms: D000324:Adrenocorticotropic Hormone / Q000032:analysis; D000595:Amino Acid Sequence; D002240:Carbohydrate Sequence; D006371:Helium; D007202:Indicators and Reagents; D009844:Oligosaccharides / Q000737:chemistry*; D010455:Peptides / Q000737:chemistry*; D010743:Phospholipids / Q000737:chemistry*; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization / Q000295:instrumentation* / Q000379:methods; D053719:Tandem Mass Spectrometry; D014466:Ultraviolet Rays
chemical_list: D007202:Indicators and Reagents; D009844:Oligosaccharides; D010455:Peptides; D010743:Phospholipids; D006371:Helium; D000324:Adrenocorticotropic Hormone