Lotfy Salah
Polymer Chemistry Department, National Center for Radiation Research and Technology, Atomic Energy Authority, P.O. Box 29, Nasr City, Cairo, Egypt.
Int J Biol Macromol. 2009 Jan 1;44(1):57-63. doi: 10.1016/j.ijbiomac.2008.10.002. Epub 2008 Oct 18.
Dextrin, which is widely used throughout many industries for their functional properties, was selected for studying the influences of gamma irradiation on its viscosity, physicochemical properties and dextrin granule structure. The formation of radicals during irradiation process of dextrin in air condition was investigated by electron spin resonance (ESR) showing the influence of irradiation and storage parameters on the nature and concentration of the free radicals. Two major radicals or groups of radicals are observed. The radicals show g-values varying among g=2.0102+/-0.0002 and g=2.0126+/-0.0006. Irradiation was observed to induce increases in the intensity of single. The material left behind after irradiation treatment was characterized using thermal analysis, TGA and DSC. A structural analysis was made using SEM and X-ray diffraction to investigate whether the partial hydrolysis had any influence on the granular structure and the crystallinity of the dextrin. The results show that dextrin undergoes oxidative degradation under the influence of gamma radiation.
糊精因其功能特性在许多行业中广泛使用，被选来研究γ辐射对其粘度、理化性质和糊精颗粒结构的影响。通过电子自旋共振（ESR）研究了糊精在空气条件下辐照过程中自由基的形成，显示了辐照和储存参数对自由基性质和浓度的影响。观察到两种主要自由基或自由基组。这些自由基的g值在g = 2.0102±0.0002和g = 2.0126±0.0006之间变化。观察到辐照会导致单峰强度增加。使用热分析、TGA和DSC对辐照处理后留下的材料进行了表征。使用SEM和X射线衍射进行了结构分析，以研究部分水解是否对糊精的颗粒结构和结晶度有任何影响。结果表明，糊精在γ辐射的影响下会发生氧化降解。
