The preparation of arabinoxylan by alkaline hydrogen peroxide extraction from destarch corn fiber, the chemical composition, monosaccharide composition and molar mass of arabinoxylan was characterized. It was found that arabinoxylan mainly contained xylose, arabinose and a small amount of glucuronic acid. Moreover, this study explored the film-forming and swelling characteristics of the mixture of corn arabinoxylan (CAX) and chitosan (CH). Under acidic conditions, arabinoxylan and chitosan were co-dissolved to form a film, and the film was swelled by soaking in water to obtain hydrogel with high swelling ability. Furthermore, the ratio of CAX/CH and the pH of acidified water affect the film-forming properties of the mixture of arabinoxylan and chitosan and the swelling degree and gel properties of the film. Water uptake was also measured as a function of alkali liquor and different pH level, which showed that the response to various stimuli was reversible. The structure of the composite film was characterized by Fourier transform infrared spectrometer (FTIR) and X-ray diffraction (XRD). The results showed that there was good compatibility between arabinoxylan and chitosan molecules. And the electrostatic interaction between the glucuronic acid carboxyl group of arabinoxylan and the amino group of chitosan occurred, which forming a complex and uniform complex. Scanning electron microscope (SEM) scanning imaging showed that the swelled hydrogel of arabinoxylan and chitosan composite film had a honeycomb-like porous structure.
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