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Evaluation of Metal Oxide Surface Catalysts for the Electrochemical Activation of Amino Acids

Department of Chemical Engineering, University of New Hampshire, Durham, NH 03824, USA
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Sensors 2018, 18(9), 3144; https://doi.org/10.3390/s18093144
Received: 9 August 2018 / Revised: 9 September 2018 / Accepted: 14 September 2018 / Published: 18 September 2018
(This article belongs to the Section Chemical Sensors)
Electrochemical detection of amino acids is important due to their correlation with certain diseases; however, most amino acids require a catalyst to electrochemically activate. One common catalyst for electrochemical detection of amino acids are metal oxides. Metal oxide nanoparticles were electrodeposited onto glassy carbon and platinum working electrodes. Cyclic voltammetry (CV) experiments in a flow cell were performed to evaluate the sensors’ ability to detect arginine, alanine, serine, and valine at micromolar and nanomolar concentrations as high as 4 mM. Solutions were prepared in phosphate buffer saline (PBS) and then 100 mM NaOH. Specifically, NiO surfaces were responsive to amino acids but variable, especially when exposed to arginine. Polarization resistance experiments and scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) data indicated that arginine accelerated the corrosion of the NiO catalyst through the formation of a Schiff base complex. View Full-Text
Keywords: sensor; cyclic voltammetry; electrocatalysis sensor; cyclic voltammetry; electrocatalysis
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Tooley, C.A.; Gasperoni, C.H.; Marnoto, S.; Halpern, J.M. Evaluation of Metal Oxide Surface Catalysts for the Electrochemical Activation of Amino Acids. Sensors 2018, 18, 3144.

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