It is noteworthy that sensitivity enhancement, compared to a direct 1D GC–MS experiment, was not measured in the present investigation. However, such a parameter was evaluated in the previous research work [7], and it was found that GC × GC signal- to-noise values increased in the range 1.1–2.0.
It is presumable that such a behaviour would have been confirmed in the present investigation. However, additional research will also be devoted to the use of even lower FM gas flows; such a further improve- ment would have beneficial effects on sensitivity and enable the use of a higher number of commercial MS systems in FM GC × GC applications.