How to find the right Lab Chromatography LC Columns & Column Supplies AI guide

What the AI looks for in Lab Chromatography LC Columns & Column Supplies

Phase chemistry

C18 is the default for reversed-phase work. Use C8 or phenyl-hexyl for alternative selectivity, polar-embedded or aqueous-stable C18 for highly aqueous mobile phases, and HILIC for very polar analytes. Match the USP L-code your method requires. Selectivity comes mainly from the phase, and the wrong one cannot be compensated for with gradient changes.

Particle size versus pressure

Sub-2 µm fully porous particles need a UHPLC system. Superficially porous particles of about 2.6 to 2.7 µm give near-UHPLC efficiency at HPLC pressures. Particles of 3 to 5 µm suit standard HPLC systems. Exceeding your pump's pressure limit makes a high-efficiency column unusable.

Column dimensions

Use 4.6 mm ID x 150 or 250 mm for conventional HPLC and 2.1 mm ID for LC-MS and UHPLC. Keep system dead volume low with narrow columns. ID sets the flow rate and MS compatibility. Length sets resolution and run time.

pH and temperature range

Standard silica columns are typically rated for about pH 2 to 8. Use hybrid or organo-silica particles for high-pH work, and check the stated temperature limit. Running outside the pH range dissolves silica or strips the bonded phase, and the column fails fast.

Pore size

Use roughly 80 to 120 Å pores for small molecules and around 300 Å or wide-pore phases for peptides and proteins. Large analytes are excluded from small pores and show poor retention and broad peaks.

Fittings and guard

Check the end-fitting style and port depth, and use adjustable or finger-tight fittings when moving between brands. Add a guard cartridge of the same phase for dirty samples. Wrong port depth creates void volume and band broadening, and a guard protects the analytical column.