Feasibility Study on Quantitative Measurements of Singlet Oxygen Generation Using Singlet Oxygen Sensor Green

被引:0
|
作者
Huiyun Lin
Yi Shen
Defu Chen
Lisheng Lin
Brian C. Wilson
Buhong Li
Shusen Xie
机构
[1] Fujian Normal University,Key Laboratory of OptoElectronic Science and Technology for Medicine of Ministry of Education, Fujian Provincial Key Laboratory for Photonics Technology
[2] University of Toronto/Ontario Cancer Institute,Department of Medical Biophysics
来源
Journal of Fluorescence | 2013年 / 23卷
关键词
Singlet oxygen; Fluorescence probe; Singlet Oxygen Sensor Green reagent (SOSG); Quantitative measurement; Luminescence; Quantum yield;
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中图分类号
学科分类号
摘要
The purpose of this study is to investigate the feasibility for quantitative measurement of singlet oxygen (1O2) generation by using a newly developed 1O2-specific fluorescence probe Singlet Oxygen Sensor Green reagent (SOSG). 1O2 generation from photoirradiation of a model photosensitizer Rose Bengal (RB), in initially air-statured phosphate buffered saline (PBS) was indirectly monitored with SOSG. In the presence of 1O2, SOSG can react with 1O2 to produce SOSG endoperoxides (SOSG-EP) that emit strong green fluorescence with the maximum at 531 nm. The green fluorescence of SOSG-EP is mainly dependent on the initial concentrations of RB and SOSG, and the photoirradiation time for 1O2 generation. Furthermore, kinetic analysis of the RB-sensitized photooxidation of SOSG is performed that, for the first time, allows quantitative measurement of 1O2 generation directly from the determination of reaction rate. In addition, the obtained 1O2 quantum yield of porphyrin-based photosensitizer hematoporphyrin monomethyl ether (HMME) in PBS by using SOSG is in good agreement with the value that independently determined by using direct measurement of 1O2 luminescence. The results of this study clearly demonstrate that the quantitative measurement of 1O2 generation using SOSG can be achieved by determining the reaction rate with an appropriate measurement protocol.
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页码:41 / 47
页数:6
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