Journal
CANADIAN JOURNAL OF CHEMISTRY
Volume 88, Issue 6, Pages 569-576Publisher
CANADIAN SCIENCE PUBLISHING
DOI: 10.1139/V10-051
Keywords
live cells; scanning electrochemical microscopy; reactive oxygen species; differential pulse voltammetry
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Funding
- Canadian Institute for Photonic Innovations (CIPI)
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Ontario Photonics Consortium (OPC)
- Canada Foundation for Innovation (CFI)
- Ontario Innovation Trust (OIT)
- Premier Research Excellence Award (PREA)
- University of Western Ontario (UWO
- Academic Development Fund (ADF)
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The redox reactions of two main components of reactive oxygen species (ROS), superoxide and hydrogen peroxide, along with oxygen in aqueous solutions were investigated using a conventional electrochemical technique, differential pulse voltammetry (DPV). Superoxide undergoes oxidation at a Pt working electrode biased at 0.055 V versus Ag/AgCl, while hydrogen peroxide can be oxidized and reduced at 0.817 and -0.745 V, respectively. Oxygen in the solutions is reduced at the electrode with an applied potential of -0.455 V. Based on these results, hydrogen peroxide and superoxide released from live cells can be successfully monitored, identified, and mapped using scanning electrochemical microscopy (SECM) at different potentials. Single human bladder (T24) cells were imaged using a 5 mm diameter SECM probe biased at -0.400, -0.600, and -0.800 V. Oxygen reduction that seems an interference can be discriminated from that of hydrogen peroxide by means of SECM.
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