Abstract
The effect of carbon nanomaterials (carbon nanotubes, thermally expanded and pyrolytic graphite) on the bioelectrochemical activity of Gluconobacter oxydans bacterial cells was studied during sorption contact with nanomaterials. For bacterial immobilization, the surface of a working bioelectrode was modified via the application of bacterial suspension in the studied nanomaterial and chitosan. The bioelectrochemical electrode characteristics (the amplitude of generated potential, cyclic volt–ampere characteristics, resistance) were estimated before and in the process of bacterial interaction with ethanol (3-electrode measurement scheme). Modification of the spectral graphite electrode by carbon nanotubes allowed a decrease in the resistance of the charge transfer by 48% and an increase in the oxidation current on cyclic volt—ampere characteristics at a voltage of 200 mV by 21% as compared with nonmodified electrode. The thermally expanded and pyrolytic graphite increased the bioelectrode resistance to 4050 and 8447 Ohm cm2, respectively. Mathematical modeling demonstrated that from 75 to 100% of biomaterial (depending on the used nanomaterial) were involved in the process of electricity generation with the selected method of the bacterial immobilization. The use of data obtained during the development of microbial biosensors and electrodes of biofuel cells is discussed.
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Original Russian Text © A.N. Reshetilov, Yu.V. Plekhanova, S.E. Tarasov, V.A. Arlyapov, V.V. Kolesov, M.A. Gutorov, P.M. Gotovtsev, R.G. Vasilov, 2017, published in Prikladnaya Biokhimiya i Mikrobiologiya, 2017, Vol. 53, No. 1, pp. 115–122.
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Reshetilov, A.N., Plekhanova, Y.V., Tarasov, S.E. et al. Effect of some carbon nanomaterials on ethanol oxidation by Gluconobacter oxydans bacterial cells. Appl Biochem Microbiol 53, 123–129 (2017). https://doi.org/10.1134/S0003683817010161
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DOI: https://doi.org/10.1134/S0003683817010161