ST-C8

For a less retentive partner to the ST-C18 range, ST-C8 columns in the HPLC Columns category use Vintage Chrom Vintage Star C8, a 3.5 µm octyl phase on 100 Å silica. Method developers use them to trim run times for hydrophobic analytes on HPLC equipment.

The 20 listings pair 50 mm and 125 mm lengths with 4 mm and 4.6 mm internal diameters. The short 50 mm columns are suited to fast gradients and screening; the 125 mm columns give the plate count needed for closely eluting impurities. Particle size and pore are constant across the set.

Switching from C18 to C8 is the usual first move when late-eluting peaks stretch a run, when a higher aqueous content is wanted in the mobile phase, or when a slightly different selectivity is needed to pull apart a critical pair. Lancetech Limited can quote any ST-C8 column and advise on moving a method between the two chemistries.