Synthesis and Properties of Carboxymethyl Gellan and Application as Edible Film

摘要

In order to develop a water solubility material possessing transparent film, Carboxymethyl Gellan (CG) was prepared by the reaction of Gellan (G) with sodium chloroacetate. The products were characterized by Fourier Transform Infrared (FTIR), Nuclear Magnetic Resonance (NMR) spectroscopy and X-Ray Diffraction (XRD). The results showed that the introduction of carboxymethyl groups improved the solubility of G. The CG films were prepared by using the casting solvent evaporation method. The properties of CG film were investigated compared to G films by Thermogravimetric Analysis (TGA), mechanical properties, water barrier properties and transparency and moisture sorption isotherm. CG film had well thermal stability, the lower Tensile Strength (TS) and higher Elongation at Break (EAB), Water Vapor Permeability (WVP) and transparency in contrast to G films. The results suggested that CG would be good use in film application as food package.