Macroporous polymer monoliths as second dimension columns in comprehensive two-dimensional gas chromatography: a...

Area of Science:

• Analytical Chemistry
• Chromatography

Background:

• Comprehensive two-dimensional gas chromatography (GC×GC) faces challenges in optimizing carrier gas velocities due to column dimension mismatches.
• This flow mismatch limits simultaneous optimal operation of both chromatographic dimensions.

Purpose of the Study:

• To develop monolithic second-dimension columns for GC×GC.
• To enable simultaneous operation at optimum carrier gas velocities in both dimensions.

Main Methods:

• Preparation and evaluation of divinylbenzene-based monolithic columns.
• Assessment of permeability, performance, plate height, and plate generation rates.
• 1D-GC experiments to evaluate resolving power and selectivity.
• Integration into a GC×GC setup as the second dimension.

Main Results:

• Achieved plate heights <0.18 mm and plate generation rates up to 600 plates/s.
• Demonstrated good resolving power and selectivity in 1D-GC experiments.
• Obtained peak capacity up to 12 peaks in 4-5s for low-boiling alkanes.
• Showed excellent repeatability (retention times RSD<0.5%, peak widths RSD<1.5%).
• Successfully operated both GC×GC dimensions at their optimum linear velocities simultaneously.

Conclusions:

• Monolithic columns offer a viable solution for optimizing GC×GC separations.
• The novel second-dimension columns facilitate simultaneous optimum-velocity operation.
• This approach enhances multidimensional separation capabilities for various applications.