Porous polymeric beads were obtained by the suspension polymerization of 2-hydroxyethyl methacrylate (HEMA) and ethylene glycol dimethacrylate (EGDMA). Poly(HEMA-EGDMA) beads were characterized by surface area measurements, swelling studies, FTIR, scanning electron microscopy (SEM), and elemental analysis. Poly (HEMA-EGDMA) beads had a specific surface area of 56 m 2/ g. SEM observations showed that the poly(HEMA-EGDMA) beads abounded macropores. Poly(HEMA-EGDMA) beads with a swelling ratio of 55%, and containing different amounts of Reactive Red 120 (9.2-39.8 mu mol/g) were used in the adsorption/desorption of human serum albumin (HSA) from aqueous solutions and human plasma. The nonspecific adsorption of HSA was very low (0.2 mg/g). The maximum HSA adsorption amount from aqueous solution in phosphate buffer was 60.1 mg/g at pH 5.0. Higher HSA adsorption value was obtained from human plasma (up to 95.7 mg/g) with a purity of 88%. The equilibrium monolayer adsorption amount, Q(max) was determined as 172.4 mg/g. The dimensionless separation factor (R-L) value shows that the adsorption behavior of HSA onto the Reactive Red 120 attached poly(HEMA-EGDMA) beads was favorable (0 < RL < 1). Desorption of HSA from Reactive Red 120 attached poly (HEMA-EGDMA) beads was performed using 0.1M Tris/HCl buffer containing 0.5M NaCl. It was observed that HSA could be repeatedly adsorbed and desorbed with Reactive Red 120-attached poly(HEMA-EGDMA) beads without significant loss in the adsorption amount. (c) 2007 Wiley Periodicals, Inc.