Hydrogen Peroxide System on a Peroxidase-Modified Carbon Black Electrode
L. V. Gegeshidze, B. N. Efremov, G. V. Zhutaeva, and M. R. Tarasevich
Frumkin Institute of Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 117071 Russia
Received December 21, 1998
Abstract—The electrochemical behavior of hydrogen peroxide and the phenol–hydrogen peroxide system are
studied on a carbon black electrode modified with peroxidase. Factors that determine the sensitivity and selec-
tivity of the phenol assay and the response linearity are studied by means of a disposable biosensor with perox-
idase. The mutual influence of various factors is found to be defined by macrokinetics of the biosensor opera-
tion. The sensitivity limit is 5 
10
7 M of phenol. The response is linear in the interval 5 10
7 to 5 10
6 M.
The selectivity of assaying phenol and some of its derivatives is established.
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