Ligand-functionalized substrates with enhanced binding capacity
An article that can be used for biomaterial capture comprises (a) a porous substrate; and (b) borne on the porous substrate, a polymer comprising interpolymerized units of at least one monomer consisting of (1) at least one monovalent ethylenically unsaturated group, (2) at least one monovalent ligand functional group selected from acidic groups, basic groups other than guanidino, and salts thereof, and (3) a multivalent spacer group that is directly bonded to the monovalent groups so as to link at least one ethylenically unsaturated group and at least one ligand functional group by a chain of at least six catenated atoms.
1. A free radically polymerizable compound consisting of (a) at least one monovalent ethylenically unsaturated group, (b) at least one monovalent ligand functional group selected from phosphorus-containing acidic groups, boron-containing acidic groups, and salts thereof, and (c) a multivalent spacer group that is directly bonded to the monovalent groups so as to link at least one ethylenically unsaturated group and at least one ligand functional group by a chain of at least six catenated atoms, said monomer of the formula:
CH 2 ═CR 1 —C(═O)—X—R 2 —[Z—R 2 ] n -L
wherein
R 1 is selected from hydrogen, alkyl, cycloalkyl, aryl, and combinations thereof;
each R 2 is independently selected from hydrocarbylene, heterohydrocarbylene, and combinations thereof;
X is —O— or —NR 3 —, where R 3 is selected from hydrogen, hydrocarbyl, heterohydrocarbyl, and combinations thereof;
Z is heterohydrocarbylene comprising at least one hydrogen bond donor, at least one hydrogen bond acceptor, or a combination thereof;
n is 1; and
L is a heteroatom-containing group comprising at least one monovalent ligand functional group selected from acidic groups, basic groups other than guanidino, and salts thereof.
2. The compound of claim 1 , wherein said ligand functional group is selected from phosphono, phosphato, boronato, and combinations thereof.