Patent ID: 7645903

Claim:
A separation matrix for affinity chromatography, comprising ligands coupled to a support, wherein the majority of the ligands are the compounds of formula (I) wherein R 1 is CH 3 or CH 2 CH 3 ; R 2 is a phenyl group that has been substituted with Cl in meta and para position; R 3 is H, CH 3 or CH 2 CH 3 ; and R 4 is a linear or cyclic aliphatic group, or, wherein R 1 and R 2 are as stated above while R 3 and R 4 are parts of a 4- to 6-membered cyclic entity, and which compound has affinity for human IgG of κ-type; further wherein said ligands are coupled to said support through the group R 4 .