ADC vs. free drug separation and analysis Author(s) Sepax The columns used in this application were Zenix SEC-80 (3 um, 80 Å, 2.1 x 50 mm), Zenix SEC-80 (3 um, 80 Å, 7.8 x 50 mm) and Zenix-C SEC-80 (3 um, 80 Å, 4.6 x 50 mm).