methods are disclosed for preparing linear or / and partial precross - linked poly - g - glutamic acid nanoparticle products , their reaction with compounds which contain vinyl groups , and the polymerization by chemical initiation or photopolymerization of these by light of predetermined wavelength . the final products of the present invention are useful as local drug delivery systems , dental surgery , and for inhibition of post - surgical adhesion . the hydrogels made from the biopolymers of the present invention may also be used in controlled release devices , superabsorbent materials and biomaterials like enzyme immobilization .