New paper in Analytical Chemistry – Select-eV unravels the composition of complex motor oils
Tuesday, 5 April 2016 at 4:07:PM
Researchers at Birmingham University have used Markes’ BenchTOF-Select time-of-flight mass spectrometer in combination with two-dimensional gas chromatography (GC×GC) to improve the separation and identification of hydrocarbons in motor oil.
‘Using variable ionisation energy time-of-flight mass spectrometry with comprehensive GC×GC to identify isomeric species’, shows how spectra acquired at 14 eV on BenchTOF-Select can
be used to positively identify isomers from the previously unresolved complex
mixture (UCM) in these samples.
paper is the first literature citation of Markes’ new Select-eV technology,
which uses revolutionary ion-source technology to generate ‘soft’ electron
ionisation spectra without the inconvenience of other approaches to soft
The study, reported in the prestigious ACS journal Analytical Chemistry, was conducted under the FASTER program, which
aims to monitor atmospheric pollution and establish the link to exhaust emissions
– for more information see the case-study on Markes’ website.
Salim Alam, one of the principal researchers on this project, says Select-eV
has “not only allowed us to observe the molecular ions of species, but has also
led us to identify the positioning of branching of straight-chain aliphatic
isomeric compounds due to their individual unique fragmentation patterns”.
authors conclude that “the combination of retention times in two
dimensions and mass spectra at low and high ionisation energies confers
unparalleled power to identify specific isomers within the chromatograms”.
M.S. Alam, C. Stark, and R.M. Harrison, Using variable ionisation energy
time-of-flight mass spectrometry with comprehensive GC×GC to identify isomeric
species, Analytical Chemistry, 2016,
(published online), http://dx.doi.org/10.1021/acs.analchem.5b03122.
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