New biodegradation Characteristic high water absorption body and its manufacturing method

摘要

PURPOSE: To obtain an object by irradiating poly(ε-lysine) with a radiation to form a crosslinked object having a specific degree of gelation without losing biodegradability. ;CONSTITUTION: This object comprises a radiation-crosslinked poly(ε-lysine) having a degree of gelation of 10-90wt.%. It is obtained by dissolving poly(ε- lysine) (a) in water or a mixed solvent comprising water and a water-soluble solvent at a polymer concentration of 1-10wt.%, irradiating the solution with a radiation, preferably gamma rays, and then separating the resulting crosslinked polymer. Upon irradiation with gamma rays in a dose of 45-250kGy, the crosslinking usually proceeds at room temp. The polymer (a) is preferably obtained by culturing Streptomyces arbulus subsp. lysinopolymeras, which is a poly(ε-lysine)-producing microorganism, in a medium and separating the yielded polymer from the culture.;COPYRIGHT: (C)1995,JPO