Chiral Recognition by Means of Mass Spectrometry
2016 (English)Licentiate thesis, monograph (Other academic)
This thesis is based on experimental studies of chiral ions in gas-phase. Electrospray ion source platform (Stockholm University) and commercially available Quadrupole Time-of-Flight mass spectrometer have been used in our studies.
Using the advantages of tandem mass spectrometry, we have investigated interactions between protonated amino acids, namely phenylalanine (Phe), tryptophan (Trp), and methionine (Met) and Trp containing diastereomeric complexes with chiral 2-butanol, and achiral (argon) targets. In high energy collisions of 1 keV in the center-of-mass (c.o.m.) frame, collision induced dissociation (CID) via multiple channels independent on the chirality of either projectile or target was observed. The fragmentation via loss of H2O + CO and NH3 were found to be the main reaction channels for all studied amino acids. The energy gained in collisions was found to be sufficient to initiate fragmentation via various competitive reaction pathways.
Chiral recognition in CID of the diastereomeric proton-bound complexes of tryptophan and 2-butanol as a function of collision energy was studied. Stereo dependent dissociation of complexes was observed, and for the first time an energy dependence has been measured for such a complex. Where possible, the comparison with previously reported results have been performed.
Place, publisher, year, edition, pages
Stockholm: Stockholm University, 2016. , 40 p.
Chirality, Mass spectrometry, Chiral recognition, Gas phase
Atom and Molecular Physics and Optics
Research subject Chemical Physics
IdentifiersURN: urn:nbn:se:su:diva-132104OAI: oai:DiVA.org:su-132104DiVA: diva2:948498
2016-06-14, FD41, Roslagstullsbacken 21, Department of Physics, AlbaNova University Center, Stockholm, 11:00 (English)
Johnsson, Per, PhD
Larsson, Mats, Professor