GCxGC Capillary GC Columns

GCxGC is one of the fastest growing areas in analytical chemistry due to its ability to resolve a large number of compounds, even in the most complex samples. No other chromatographic technique can match the level of detail it provides. Common detectors, including MS, can be used. It employs two columns in series, separated by a modulator. The role of the modulator is to collect fractions from the first column (often called the primary column, first dimension column, or 1D column) and focus them onto the second column (often called the secondary column, second dimension column, or 2D column). First dimension columns tend to be 30 m x 0.25 mm I.D., whereas second dimension columns tend to be short, cut down lengths of stock columns (0.10 or 0.18 mm I.D. for non-MS detectors, and 0.18 or 0.25 mm I.D. for MS detectors).

One key to the successful operation of GCxGC is that the two columns must have orthogonal selectivity, that is, they must utilize different retention mechanisms. The more different (more orthogonal), the better the overall performance will be. We offer columns for three column selection strategies to achieve orthogonal selectivity:
  • Non-polar to polar strategy
  • Polar to non-polar strategy
  • High resolution polar to non-polar strategy