Insights into the effects of gamma-irradiation on the microstructure, thermal stability and irradiation-derived degradation components of microcrystalline cellulose (MCC)

文献类型： 外文期刊

第一作者： Zhou, Hua

作者： Zhou, Hua;Chen, Jingping;Wu, Xiaofeng;Wang, Keqin;Chen, Liang;Su, Xiaojun;Xiong, Xingyao;Xiong, Xingyao

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期刊名称：RSC ADVANCES （ 影响因子：3.361； 五年影响因子：3.39 ）

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收录情况： SCI

摘要： It has been demonstrated that radiation pretreatment can cause a significant breakdown of the stubborn cellulose structure, which will increase the accessibility of cellulose and enhance enzyme hydrolysis in bio-fuel processes. In this study, using microcrystalline cellulose (MCC) as a model substrate, the impacts of irradiation dose on the microstructure, thermal stability and irradiated-degradation components of cellulose under Co-60 gamma-irradiation (0-1400 kGy) was comprehensively investigated. FT-IR, EPR and NMR analyses show that irradiation destroys the glycosidic bond and inter- and intra-molecular hydrogen bond of cellulose, resulting in the generation of reductive carbonyl groups and free radicals. SEM, XRD and GPC analyses confirm that irradiation can damage the crystalline microstructure and surface morphology of MCC, which reduces its degree of polymerization from 183 045 kDa to 4413 kDa. TGA and DGA curves indicate that the activated energy (E-a) and thermal stability of treated MCC decrease with the increasing irradiation dose. Ion chromatography (IC) analysis demonstrates that there exist fermentation sugars such as glucose (10.73 mg g(-1)), xylose (1.58 mg g(-1)), arabinose (0.46 mg g(-1)), fructose (4.31 mg g(-1)), and cellobiose (1.90 mg g(-1)) as well as low amounts of glucuronic acid (0.35 mg g(-1)) and galacturonic acid (1.46 mg g(-1)) in the irradiation-derived degradation components. Therefore, the findings in this study suggest that gamma-irradiation processing is an environment-friendly, promising and effective approach to treat lignocellulose biomass.

分类号： O6

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