ESR spin trap investigations on aqueous glucose solutions irradiated by ultrasound and gamma-rays |
| |
| Affiliation: | 1. Université Grenoble-Alpes – Laboratoire des Ecoulements Géophysiques et Industriels – LEGI UMR 5519, Domaine Universitaire, CS 40700, 38058 Grenoble Cedex 9, France;2. Université Grenoble-Alpes, CEA-LITEN, 17 Rue des Martyrs, 38000 Grenoble, France;3. Université Grenoble-Alpes – Laboratoire Rhéologie et Procédés – LRP UMR 5520, Domaine Universitaire, BP 53, 38610 Gières, France;1. Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China;2. Shandong Longlive Bio-Technology Co., Ltd., Shandong 251200, China;1. Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China;2. Key Laboratory for Forest Resources Conservation and Utilisation in the Southwest Mountains of China, Ministry of Education, Southwest Forestry University, Kunming 650224, PR China;3. Shanghai Dssun New Material Co., Ltd., Shanghai 200233, China;4. College of Light Industry and Food Engineering, Guangxi University, Nanning 530000, China;5. College of Light Science and Engineer, South China University of Technology, Guangzhou 510641, China;6. Center for Lignocellulose Science and Engineering, College of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian 116034, China |
| |
| Abstract: | ![]()
Applying 5,5-dimethylpyrroline-N-oxide (DMPO) as the spin trap, the radical adducts produced by ultrasound and γ-irradiation of water and aqueous solutions of d-glucose are compared. In the ESR-spectra obtained for sonolysis and radiolysis of water, H- and OH-adducts are present. In glucose solutions for both types of irradiation the H-adduct is also detected. However, OH-adduct is completely lacking and there is no evidence for the formation of adducts originating from glucosyl radicals. To explain these experimental observations the following mechanism is proposed: the OH- and H-radicals produced by sonolysis or radiolysis in water abstract carbon bond hydrogens from glucose generating glucosyl radicals. This explains the lack of OH-adducts. The glucosyl radicals stabilise by H-transfer to the spin trap. This explains the presence of H-adducts and the lack of glucosyl-adducts. The splitting constants of three additional radical adducts, which are present in minor concentrations as well in water as in glucose solutions, were evaluated. They are supposed to be spin adducts resulting from H-abstraction from DMPO. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
