The Agilent 7250 QTOF detector delivers high-resolution MS data, tunable ionization energy and MS/MS capability. Accurate-mass spectra with classic ionization can therefore be complemented with soft ionization spectra as well as MS/MS data for identity confirmation of targets and structure elucidation of unknowns. This makes GC-QTOF valuable for challenging applications that demand confident identification in highly complex matrices (e.g. metabolomics, pesticides analysis). Comprehensive two-dimensional gas chromatography (GC×GC) is the chromatographic method of choice to unravel high sample complexity. Compared to classic GC, GC×GC grants superior separation power and unmatched peak capacity by coupling two different separation mechanism in a single analysis. Co-elutions are avoided or minimized, granting easier identification and more reliable quantification. Several examples are available for GC×GC in combination with the QTOF used in scan mode as a HRMS-TOF detector. The elevated number of resolved peaks and the clean 2D spectra, in combination with formula generation based on accurate-mass data, allow more precise and informative profiling. However, up to now GC×GC is hardly used in combination with the QTOF in MS/MS mode. In the full application note the feasibility of GC×GC-QTOF-MS/MS is investigated.
Geschreven door JSB, Joint Analytical Systems Benelux B.V.
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