A composite biological-molecule-accretion material (10) is described for extracting desired target biological molecules from aqueous solution (24) and substantially permanently binding to those molecules. The material (10) includes a first component (10a^_) designed with a binding affinity for proteins and peptides in such solution, and a second component (10b^_) designed with a binding affinity for nucleic acids in such solution. The material (10) is capable of being formed in a body (12) for passing such solution through it, and such passing has the effect of removing the proteins, peptides and nucleic acids from such solution and binding them to the body. That binding is substantially permanent so that subsequent passage of additional aqueous solution will not unbind substantially the accreted proteins, peptides and nucleic acids. The first component (10a^_) may include dextran-coated (10a^_2) activated charcoal particles (10a^_1), and the second component may include an anion-exchange resin and a cation-exchange resin. Preferred relative volumes of both components are 1:1. Also described is a method for extracting desired target biological molecules from aqueous solution and substantially permanently binding them to a solid, and a method of filtering target biological molecules out of water.
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