Journal
ELECTROANALYSIS
Volume 24, Issue 6, Pages 1386-1393Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.201200061
Keywords
Hemoglobin; Ionic liquid; Multiwalled carbon nanotubes; Electrocatalysis; Hydrogen peroxide; Trichloroacetic acid
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Hemoglobin (Hb) was directly immobilized on a multiwalled carbon nanotubes ionic liquid electrode by immersing this electrode in a solution consisting of Hb and 1-octyl-pyridinium chloride as an ionic liquid. The immobilized Hb displayed a pair of well-defined cyclic voltammetric peaks with a formal potential of -0.187 V in acetate buffer solution, pH 5.0. This modified electrode exhibits fast response, a long linearity range, a low detection limit, high stability and excellent sensitivity through hydrogen peroxide detection with a detection limit (3s) of 3.18 mu M. The electrode was also used for electrocatalysis and voltammetric determination of oxygen and trichloroacetic acid.
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