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Study on the generation mechanism of reactive oxygen species on calcium peroxide by chemiluminescence and UV‐visible spectra
Author(s) -
Ma Yong,
Zhang BoTao,
Zhao Lixia,
Guo Guangsheng,
Lin JinMing
Publication year - 2007
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.1003
Subject(s) - chemistry , chemiluminescence , oxidizing agent , reactive oxygen species , radical , luminol , peroxide , superoxide , oxygen , photochemistry , aqueous solution , hydrogen peroxide , calcium , hydroxyl radical , inorganic chemistry , nuclear chemistry , organic chemistry , biochemistry , enzyme
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[1,2 α ]‐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 ). Copyright © 2007 John Wiley & Sons, Ltd.
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