壳聚糖辐射降解产物的水溶性研究

文中研究了壳聚糖γ辐射降解产物的水溶性规律。用凝胶渗透色谱(GPC)、傅立叶变换红外光谱(FT-IR)和X射线衍射(XRD)对降解产物进行表征分析。讨论了温度、辐射剂量、产物数均相对分子质量、产物化学结构以及结晶形态对溶解度的影响。结果表明,随着辐射剂量增加,数均相对分子质量的不断减小,产物在水中的溶解度不断增大。水溶性产物与不溶性产物在化学结构与结晶形态上存在明显差异。降解过程中壳聚糖结晶形态由初始的α态向β态转变,结晶度不断下降。一定条件下,结晶形态是决定产物水溶性的主要因素。

Study on the water-solubility of chitosan degraded with gamma radiation

The study on water-solubility of chitosan degraded by gamma radiation was presented.Gel permeation chromatography(GPC),Fourier transform infrared spectrometer(FT-IR),X-ray diffraction(XRD) were adopted to characterize and analyze the degraded products.The effects of temperature,radiation dose,molecular mass,chemical structure and crystal form of the product on its water-solubility were investigated.The results show that in degradation,the solubility of products in water increases with the reduction of molecular mass.The chemical structure of water-soluble chitosan is obviously different from that of water-insoluble chitosan.With degradation,chitosan′s crystal form changes from initial α-state to β-state,with crystal degree decreasing unceasingly.Under the certain condition,crystallinity is the main factor for determining the water-solubility of the products.