Real-Time Monitoring of Superoxide Anion Radical and Hydrogen Peroxide Generation in Higher Plants in Response to Wounding: In-Vivo Electrochemical Study

2016 ◽  
Keyword(s):  
Hydrogen Peroxide ◽  
Real Time ◽  
Superoxide Anion ◽  
Anion Radical ◽  
Higher Plants ◽  
Superoxide Anion Radical ◽  
Electrochemical Study ◽  
Real Time Monitoring ◽  
Hydrogen Peroxide Generation

scholarly journals Real-time monitoring of superoxide anion radical generation in response to wounding: electrochemical study

PeerJ ◽  
2017 ◽  
Vol 5 ◽  
pp. e3050 ◽  
Author(s):  
Ankush Prasad ◽  
Aditya Kumar ◽  
Ryo Matsuoka ◽  
Akemi Takahashi ◽  
Ryo Fujii ◽  
...  
Keyword(s):  
Real Time ◽  
Superoxide Anion ◽  
Anion Radical ◽  
Spinacia Oleracea ◽  
Superoxide Anion Radical ◽  
Stress Factors ◽  
Iron Porphyrin ◽  
Real Time Monitoring ◽  
Kinetic Measurements ◽  
Oxidation Current

Background The growth and development of plants is deleteriously affected by various biotic and abiotic stress factors. Wounding in plants is caused by exposure to environmental stress, mechanical stress, and via herbivory. Typically, oxidative burst in response to wounding is associated with the formation of reactive oxygen species, such as the superoxide anion radical (O2•−), hydrogen peroxide (H2O2) and singlet oxygen; however, few experimental studies have provided direct evidence of their detection in plants. Detection of O2•− formation in plant tissues have been performed using various techniques including electron paramagnetic resonance spin-trap spectroscopy, epinephrine-adrenochrome acceptor methods, staining with dyes such as tetrazolium dye and nitro blue tetrazolium (NBT); however, kinetic measurements have not been performed. In the current study, we provide evidence of O2•− generation and its kinetics in the leaves of spinach (Spinacia oleracea) subjected to wounding. Methods Real-time monitoring of O2•− generation was performed using catalytic amperometry. Changes in oxidation current for O2•− was monitored using polymeric iron-porphyrin-based modified carbon electrodes (φ = 1 mm) as working electrode with Ag/AgCl as the reference electrode. Result The results obtained show continuous generation of O2•− for minutes after wounding, followed by a decline. The exogenous addition of superoxide dismutase, which is known to dismutate O2•− to H2O2, significantly suppressed the oxidation current. Conclusion Catalytic amperometric measurements were performed using polymeric iron-porphyrin based modified carbon electrode. We claim it to be a useful tool and a direct method for real-time monitoring and precise detection of O2•− in biological samples, with the potential for wide application in plant research for specific and sensitive detection of O2•−.

In vivo real-time measurement of superoxide anion radical with a novel electrochemical sensor

2009 ◽  
Vol 47 (7) ◽  
pp. 1039-1048 ◽  
Author(s):  
Motoki Fujita ◽  
Ryosuke Tsuruta ◽  
Shunji Kasaoka ◽  
Kenji Fujimoto ◽  
Ryo Tanaka ◽  
...  
Keyword(s):  
Electrochemical Sensor ◽  
Real Time ◽  
Superoxide Anion ◽  
Anion Radical ◽  
Time Measurement ◽  
Superoxide Anion Radical ◽  
Real Time Measurement
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