A pseudobioaffinity chromatography adsorbent adapted for use in selectively adsorbing immunoglobulins. In one embodiment, the adsorbent comprises: (a) a solid support material; and (b) a ligand immobilized on the surface of the solid support material, said ligand being a compound of the formula 1 wherein Y1 is selected from the group consisting of S, SCH3null, O, NH, NCH3, CH2 and CR1R2 wherein at least one of R1 and R2 is not hydrogen; wherein each of Y2, Y3 and Y4 is selected from the group consisting of N, NCH3null, CH, and CR wherein R is not hydrogen; and wherein at least two of Y1, Y2, Y3 and Y4 are neither CH2, CH, CR nor CR1R2.