摘要
Antioxidant function and solubility in water are highly desirable in many applications of chitosan.In this paper,a xylan/chitosan composite was prepared in an ionic liquid system using glutaraldehyde as a crosslinking agent.The antioxidant activity,reducing capacity and metal ion chelating ability of the resulting composite were determined.The chemical structure and thermal stability were analyzed by FT-IR,XRD and TGA.The results showed that chitosan was successfully cross-linked with xylan by glutaraldehyde in the ionic liquid system.Compared to pure chitosan,the ABTS·+scavenging activity of the xylan/chitosan composite increased from 10.56%to 97.59%.After cross-linking with xylan by glutaraldehyde,the reducing power of xylan/chitosan composite increased from 0.054 to 2.109.The capacity of chelating metal ion of the composite also increased from 42.35%to 86.71%compared to that of pure chitosan.An underlying mechanism was proposed to account for the improvement of the chemical properties of the chitosan in the composite.
基金
support from the key research and development program of Shandong province (Grant No.2016GGX108002)
the National Natural Science Fund (31370581).
