Abstract

VILLAMIZAR, Erika N.; RIOS, Carlos A.  and  CASTILLO, John J.. A Hydrogen Peroxide Biosensor Based on the Immobilization of the Highly Stable Royal Palm Tree Peroxidase (Roystonea regia) with Chitosan and Glutaraldehyde on Screen-printed Graphene Electrodes. J. Mex. Chem. Soc [online]. 2016, vol.60, n.3, pp.135-140. ISSN 1870-249X.

This paper present the fabrication and electrochemical studies of a screen-printed graphene electrode (SPGE) modified with Royal palm tree peroxidase (RPTP) in combination with chitosan (CS) and cross-linking of glutaraldehyde (GA) for detection of hydrogen peroxide. Cyclic voltammograms in the presence of potassium ferrocyanide ([Fe(CN)6]3-/4-) as a redox species demonstrated an increasing of 50 μA evidenced by the electron transfer process of SPGE modified with CS-GA-RPTP. The graphene modified electrode exhibits excellent electrocatalytic activity to the reduction of H2O2, with a linear response in the 100 μM to 5 μM concentration range and a detection limit of 87 μM. The new sensor based on the modification of graphene electrode with the high stable RPTP will provide a potential amperometric detection system for determination of H2O2 in real samples with some biomedical or environmental importance.

Keywords : Royal palm tree peroxidase; graphene; sensor; hydrogen peroxide.

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