Adsorbents comprising anthraquinone dye-ligands for the separation of biological materials

A process for the separation of biological materials, wherein an adsorbent is used, which comprises a reaction product of a compound of formula, , and a substrate having a group capable of reaction with a reactive group in said compound of formula (1) to form a covalent bond, in which B is C2-C12 alkylene radical, which can be interrupted by 1,2 or 3 members from the group consisting of -NR1- or -O- and is unsubstituted or substituted by hydroxyl, sulfo, sulfato, cyano or carboxyl, R1 is hydrogen or C1-C4alkyl, or B is a C5-C9cycloalkylene radical, C1-C4alkylene-C5-C9cycloalkylene radical or C1-C4alkylene-C5-C9cycloalkylene-C1-C4alkylene radical, which are unsubstituted or substituted by C1-C4alkyl, C1-C4alkoxy, sulfo, halogen or carboxyl, or a phenylene radical, C1-C4alkylene-phenylene radical or C1-C4alkylene-phenylene-C1-C4alkylene radical, which are unsubstituted or substituted by C1-C4alkyl, C1-C4alkoxy, C2-C4alkanoylamino, sulfo, halogen or carboxyl, V is a non-fibre-reactive substituent or is a fibre-r