a gel - fiber glass is a newly - formed sol - gel glass polymerized from tetramethoxysilane on the surface of activated glass wool fibers or activated fibrous glass . gfg is a support for trapped chemical or biochemical reagents . a thin layer of reagents trapped in gel glass during its preparation is present on the surface of a lattice of glass fibers . columns for affinity chromatography were prepared from the gfg membranes with entrapped antigens or antibodies and were used to isolate different proteins , including tumor - associated antigens ; gfg membrane demonstrated high effectiveness and stability , and can isolate proteins in extremely high amounts . the membranes can be used in diagnostic practice , generation of specific antibodies and therapy .