The electrodes, produced using matrix printing technique, were modified with protein hydrogel containing bacterial
cells. The aim of this study was to estimate modification parameters and the effciency of biosensors during express-
determination of biological oxygen demand (BOD). Protein hydrogel was formed from cross-linked bovine serum albumin
covalently bound to residual ferrocene carboxaldehyde. Bacterial cells G. oxydans (ВКМ B-1280) were used as raw material
for biocatalyst. For the mediators of ferrocene series: ferrocene, ferrocene carboxaldehyde, 1,1’-ferrocenedimethanol,
1,1’-dimethylferrocene or ethylferrocene the indices of their bioelectrocatalytic effciency were first determined in the
course of immobilization in hydrogel. It was found that the mechanism of electron transfer in the system follows a ping-
pong model. The use of protein hydrogel led to a considerable increase in stability of the analytical signal of the
microbial biosensor. The BOD levels of wastes were detected using a fabricated biosensor. The range of measured BOD
concentrations was 0.162–23 mg O2/l with the standard deviation of 5%. It was shown that the use of protein matrix based
on ferrocene carboxaldehyde and the mentioned bacterial cells in combination with the electrode, produced through a
matrix printing, provides the possibility of obtaining data strongly correlated with the results of standard method.
Key words:
biosensor, screen-printed electrode, redox polymer, ferrocene derivative, G. oxydans
Cite:
Kamanin S. S., Arlyapov V. A., Ponamoreva O. N., Blokhin I. V., Alferov V. A., Reshetilov A. N.
Grafitovye pechatnye elektrody, modifitsirovannye provodyashchim belkovym gidrogelem i bakterialnymi kletkami, kak osnova amperometricheskogo biosensora
[Screen-printed electrodes modified with protein hydrogel and bacterial cells as the basis of amperometric biosensor].
Sensornye sistemy [Sensory systems].
2017.
V. 31(2).
P. 161-171 (in Russian).
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