No-fuss GCxGC solution
ARC’s simple stop-flow modulator can be installed in minutes and turn any GC into a powerful multi-dimensional separation machine. ARC’s modulator emphasizes robustness, simplicity, and ease of use to allow anyone from a novice GC user to a veteran expert to generate valuable chemical data on the most complex samples. This affordable package includes free, open-source software (visualization only), and ARC’s lifetime support. For power users we offer GC Image software. Contact us today to purchase.
Product Brochure Press Release Contact
Publication: Quasi-Stop-Flow Modulation Strategy for Comprehensive Two-Dimensional Gas Chromatography
Authors: Xiaosheng Guan (J&X Technologies), Jim Luong (Dow Chemical Canada), Ziwei Yu (J&X Technologies), Hai Jiang (J&X Technologies)
Biodiesel example (1D on left, 2D on right):
Why should I use GCxGC?
The separation of compounds by gas chromatography is typically performed using a single analytical column. As samples become more complex, it can become difficult to separate all the compounds from each other and they can start to overlap, or co-elute. Longer or narrower columns can be used to increase resolving power, but with diminishing returns.
Comprehensive two-dimensional GC, or GCxGC, drastically increases separation power by adding a second analytical column after the first column. A modulator placed between the two columns pulses the analytes from the first column onto the second column. When the columns are orthogonal in separation power, this technique can result in an order of magnitude increase in the number of analytes that can be detected.
ARC’s solution takes advantage of stop-flow modulation to make GCxGC an attainable configuration for any analytical laboratory. It involves continually sampling the effluent from the first column into an accumulator tube and re-injecting it onto a second, smaller column with orthogonal separation. This second separation happens in the time it takes to accumulate the next sample. The pulse time is known as the modulation time.