Bioelectrocatalytic reduction of peroxide compounds on the peroxidase-nafion compositeстатья

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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.

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[1] Bioelectrocatalytic reduction of peroxide compounds on the peroxidase-nafion composite / M. A. Osina, V. A. Bogdanovskaya, M. R. Tarasevich, A. I. Yusipovich // Russian Journal of Electrochemistry. — 2004. — Vol. 40, no. 8. — P. 802–812. Electrochemical reactions of peroxide compounds (hydrogen peroxide and peracetic and perbenzoic acids) on an electrode of pyrocarbon with immobilized horseradish peroxidase (HRP) are studied. The immobilization of HRP is performed in the composition of a composite with Nafion whose structure is studied by a method of scanning tunneling microscopy. The proposed composite material provides for a high catalytic activity and stability of enzyme in the reaction of reduction of peroxide compounds. It is shown that the electrocatalytic reduction of the studied compounds on the electrode with the peroxidase-Nation composite proceeds in conditions of direct bioelectrocatalysis. The effect of the solution pH and the concentration of substrates on the electrocatalytic activity of HRP in the composition of the composite is studied. On the basis of the obtained results a possible mechanism of the electrocatalytic reduction of peroxide compounds in the presence of HRP is suggested. The rate of a bioelectrocatalytic process is defined by the nature and concentration of the substrate as well as by the electrode potential and the solution pH. [ DOI ]

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