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Electrochemical detection of copper ions leached from CuO nanoparticles in saline buffers and biological media using a gold wire working electrode

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Abstract

We performed explorative cyclic voltammetry in phosphate-buffered saline buffers, Dulbecco’s modified Eagle’s medium (DMEM), and fetal bovine serum-added DMEM using Au wire as working electrode, both in the absence and in the presence of known nominal concentrations of Cu2+ ions or 15 nm CuO nanoparticles. Addition of either Cu2+ ions or aqueous suspension of CuO nanoparticles caused a single anodic peak to appear in the double-layer region of all three pristine media. The height of the anodic peak was found to increase in a monotonic fashion vs. Cu2+ concentration in Cu2+-added media, and versus time since CuO addition in CuO-added media. Stepwise addition of glycine to Cu2+-added phosphate-buffered saline buffer caused an increasing cathodic shift of the anodic peak accompanied by decreasing peak currents. Results indicate that preparing Cu2+-free suspensions of CuO nanoparticles in such media is difficult, owing to the presence of leached copper ions. The implications on results of experiments in which CuO nanoparticle-added biological media are used as cell culture substrates are discussed. Literature data on the interactions between Cu2+ ions, dissolved carbon dioxide in aqueous CuO suspensions, and amino acids present in such media are compared to our results.

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Acknowledgments

Funding from the Sustainable Nanotechnologies (SUN)—2013-2017—FP7-NMP-2013-LARGE-7-604305SUN Project is gratefully acknowledged. We also wish to thank Prof. Angelo Casagrande, Associated Professor, Department of Industrial Engineering, University of Bologna, for granting the use of the Autolab electrochemical workstation.

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  1. ISTEC-CNR, via Granarolo 64, 48018, Faenza, RA, Italy

    Carlo Baldisserri & Anna Luisa Costa

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  1. Carlo Baldisserri
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  2. Anna Luisa Costa
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Correspondence to Carlo Baldisserri.

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Baldisserri, C., Costa, A.L. Electrochemical detection of copper ions leached from CuO nanoparticles in saline buffers and biological media using a gold wire working electrode. J Nanopart Res 18, 96 (2016). https://doi.org/10.1007/s11051-016-3403-4

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