Effect of high-temperature on high-performance liquid chromatography column stability and performance under...

Area of Science:

• Analytical Chemistry
• Chromatography

Background:

• High-temperature liquid chromatography (HTLC) offers advantages for analyzing challenging samples.
• Evaluating column stability and performance at extreme temperatures is crucial for method development.

Purpose of the Study:

• To assess the stability and performance of commercially available analytical columns under temperature-programmed HTLC conditions.
• To compare temperature-programmed analysis with solvent gradient analysis.

Main Methods:

• Six analytical columns (4.1 or 4.6 mm i.d.) were evaluated.
• Temperature-programmed HTLC was used with acidic, basic, and neutral mobile phases.
• Seven components (acidic, basic, neutral) were analyzed.
• Column stability was monitored using a two-component test mix.

Main Results:

• Zirconia-based columns showed column bleed under temperature-programmed conditions.
• Polydentate silica, polystyrene-divinylbenzene (PS-DVB), and graphitic carbon columns performed well with no degradation.
• Relative standard deviations for retention times and efficiencies were generally below 15%.
• Polydentate silica columns were programmed to 100°C, PS-DVB to 150°C, and graphitic carbon to 200°C.
• Temperature programming yielded comparable peak capacities and retention behaviors to solvent gradient analysis.

Conclusions:

• Polydentate silica, PS-DVB, and graphitic carbon columns are suitable for high-temperature applications.
• Temperature programming can effectively replace solvent gradient analysis for 4.1/4.6 mm columns without compromising peak capacity.