a method of producing a material for purification of physiological liquids of organism has the steps of providing a polymer which has a size , a shape , and a structure selected so as to remove toxic compounds from the physiological liquids , chemically modifying a surface of the polymer so as to provide hydrophilicity and biocompatibility , and performing the modification in a medium with a content of organic substance which is efficient for preventing endotoxins contamination of the polymer .