Study on the generation mechanism of reactive oxygen species on calcium peroxide by chemiluminescence and UV-visible spectra

✍ Scribed by Yong Ma; Bo-Tao Zhang; Lixia Zhao; Guangsheng Guo; Jin-Ming Lin

• Publisher: John Wiley and Sons
• Year: 2007
• Tongue: English
• Weight: 368 KB
• Volume: 22
• Category: Article
• ISSN: 1522-7235
• DOI: 10.1002/bio.1003

✦ Synopsis

In the present work, the generation mechanism of reactive oxygen species (ROS) on calcium peroxide (CaO(2)) was studied. A very intense chemiluminescence (CL) signal was observed when adding an aqueous solution of luminol or 2-methyl-6-(4-methoxyphenyl)-3,7-dihydroimidazo[1,2alpha]-pyrazin-3-one hydrochloride (MCLA) to a suspension of CaO(2). The ROS released on CaO(2) were thought to be oxidizing agents leading to CL, and were characterized by CL, UV-visible (UV-vis) spectra and the effective scavengers of the special ROS. From experimental results, the hydroxyl (.OH) and superoxide (.O(2) (-)) radicals were suggested to exist on the surface of CaO(2). A reaction scheme for the formation of the ROS on CaO(2) was also proposed and discussed. Of more interest was the finding that the CaO(2) which released the .OH and .O(2) (-) on the surface exhibited good transition properties compared with alkaline-earth metal peroxides of the same group (MgO(2), BaO(2)).