Abstract: A separation medium in macroporous gel form is disclosed which is obtainable by cooling an aqueous solution of at least one gel forming polymer to a temperature, at which the solvent in the system is partially frozen with the dissolved substances concentrated in the non-frozen fraction of the solvent, said gel forming polymer being selected from the group consisting of polymers normally forming gels too fast when an aqueous solution thereof is cooled to a temperature within a range below 0° C. to enable the formation of a cryogel and said cooling being carried out in the presence of at least one chaotropic agent in said aqueous solution in order to prevent gel formation before the polymer solution is frozen. The use of said separation medium for diverse separation purposes is also disclosed.

Abstract: A separation medium in macroporous gel form is disclosed which is obtainable by cooling an aqueous solution of at least one gel forming polymer to a temperature, at which the solvent in the system is partially frozen with the dissolved substances concentrated in the non-frozen fraction of the solvent, said gel forming polymer being selected from the group consisting of polymers normally forming gels too fast when an aqueous solution thereof is cooled to a temperature within a range below 0° C. to enable the formation of a cryogel and said cooling being carried out in the presence of at least one chaotropic agent in said aqueous solution in order to prevent gel formation before the polymer solution is frozen. The use of said separation medium for diverse separation purposes is also disclosed.

Abstract: A separation medium in macroporous gel form is disclosed which is obtainable by cooling an aqueous solution of at least one gel forming polymer to a temperature, at which the solvent in the system is partially frozen with the dissolved substances concentrated in the non-frozen fraction of the solvent, said gel forming polymer being selected from the group consisting of polymers normally forming gels too fast when an aqueous solution thereof is cooled to a temperature wthin a range below OoC to enable the formation of a cryogel and said cooling being carried out in the presence of at least one chaotropic agent in said aqueous solution in order to prevent gel formation before the polymer solution is frozen. The use of said separation medium for diverse separation purposes is also disclosed.

Abstract: A macroporous gel is disclosed which is obtainable by a) polymerizing an aqueous solution of one or more water-soluble monomers selected from the group consisting of: N-substituted and non-substituted (meth)acrylamides; N-alkyl substituted N-vinylamides; hydroxyalkyl (meth)acrylates; vinylacetate; alkylethers of vinyl alcohol; ringsubstituted styrene derivatives; vinyl monomers; (meth)acrylic acid and salts thereof; silicic acid; and monomers capable of forming polymers via polycondensation, under freezing at a temperature below the solvent crystallization point, at which solvent in the system is partially frozen with the dissolved substances concentrated in the non-frozen fraction of solvent to the formation of a cryogel, and b1) modifying the cryogel by introducing a member selected from the group consisting of ligands, charged groups, dyes and hydrophobic groups thereinto (i) in one or more steps by methods known per se subsequent to thawing of the cryogel or (ii), when appropriate, by using appropriately