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A new chitosan derivative is prepared using chitosan. Ethyl cholorocarbonate was first introduced to the hydroxyl group of phthaloylchitosan through a nucleophilic reaction. Hydrazine was then added to recover the amino groups of chitosan, and promote cross-linking. The structure of this new chitosan derivative was characterized by Fourier transform infrared (FT-IR) and proton nuclear magnetic resonance (1H NMR) spectroscopy, and its physical properties were determined by X-ray diffraction (XRD), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). The thermal and chemical stabilities of the new derivative were improved compared with those of native chitosan. Assay of Escherichia coli adhesion on a film based on this chitosan derivative showed good adsorption and biofilm formation.

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