In vitro antibacterial and antifungal assay of poly-(ethylene oxamide-N,N′-diacetate) and its polymer-metal complexes

A new polyester, poly-(ethylene oxamide-N,N'-diacetate) (PEODA), containing glycine moiety was synthesized by the reaction of oxamide-NN'-diacetic acid and ethylene glycol and its polymer-metal complexes were synthesized with transition metal ions. The monomer oxamide-NN'-diacetic acid was prepared by the reaction of glycine and diethyl oxalate. The polymer and its metal complexes were characterized by elemental analysis and other spectroscopic techniques. The in vitro antibacterial activities of all the synthesized polymers were investigated against some bacteria and fungi. The analytical data revealed that the coordination polymers of Mn(II), Co(II) and Ni(II) are coordinated with two water molecules, which are further supported by FTIR spectra and TGA data. The polymer-metal complexes showed excellent antibacterial activities against both types of microorganisms; the polymeric ligand was also found to be effective but less so than the polymer-metal complexes. On the basis of the antimicrobial behavior, these polymers may be used as antifungal and antifouling coating materials in fields like life-saving medical devices and the bottoms of ships. Copyright (c) 2007 John Wiley & Sons, Ltd.