The performance of a reverse-inject differential flow modulator
based on capillary flow technology for GC × GC has been evaluated
and critically discussed in view of its adoption for quantitative pro-
filing and fingerprinting of medium-to-highly complexity essential
oils. In particular, the adoption of an integrated platform that
includes a dual-secondary-column, dual-detection system with
different column dimensions and stationary phases were very
effective in terms of key-performance parameters and information
potentials. Net separation measure (SGC×GC), modulation ratio (MR),
separation space used, peak symmetry, chromatographic repeatability
in terms of 2D peak pattern/retention (CV% on 1D and 2D
Rts – see Tables 5 and 6) and 2D peaks normalized volumes (CV%
– see Tables 5 and 6) were highly satisfactory, if compared to the
forward fill/flush differential flow modulator dynamics and/or to
those with a full-flexible design [16,17].
The system potential for quantitative profiling of mediumcomplexity
EOs (mint and lavender) were confirmed by the
accuracy ofthe results;in addition,the dual parallel detection plays
a fundamental role by combining identity confirmation and quantitation
by MS signal with the possibility to extend quantitation to
all identified components by using FID-PRFs.
Complex mixtures with more than 500 detectable 2D peaks,
within a limited retention index window (vetiver EOs),took advantage
of the system peak capacity and selectivity giving reliable and
informative 2D fingerprints to be exploited for sample classification
and quality control.
Experimental results presented in this study, together with the
acceptable operational costs, the relative ease of use and simple
maintenance of CFT reverse-inject differential flow modulation
GC × GC, are promising and can promote the use of this technique
for routine analysis in the flavor and fragrance field.