Evaluation of column bleed by using an ultraviolet and a charged aerosol detector coupled to a high-temperature liquid chromatographic system

In this study, five different HPLC columns were heated to 200 °C using a homemade heating system which can be operated in temperature programmed mode. The column bleed as an indicator of induced degradation of the stationary phase material was evaluated using a charged aerosol detector (CAD) and an ultraviolet diode array detector (UV-DAD) at different wavelengths. The silica based C-18 stationary phase gave the highest bleed, and the carbon clad titanium dioxide column the lowest bleed. This was independent of both the detection technique and the wavelength.