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Electroanalytical Study of Prussian Blue Modified Glassy Carbon Paste Electrodes
Author(s) -
Ricci Francesco,
Gonçalves Carla,
Amine Aziz,
Gorton Lo,
Palleschi Giuseppe,
Moscone Danila
Publication year - 2003
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200390148
Subject(s) - glassy carbon , prussian blue , cyclic voltammetry , amperometry , electrochemistry , voltammetry , carbon fibers , analytical chemistry (journal) , electrode , ferricyanide , chemistry , materials science , nuclear chemistry , inorganic chemistry , chromatography , composite material , composite number
Two types of glassy carbon (GC) powder (i.e., Sigradur K and Sigradur G) have been mixed with mineral oil to obtain glassy carbon paste electrodes (GCPE's). The electrochemical behavior of such electrodes at different percentages of glassy carbon has been evaluated with respect to the electrochemistry of ferricyanide as revealed with cyclic voltammetry and the best paste composition was chosen. GC was then modified with Prussian Blue (PB), mixed at different percentages with unmodified GC and with a fixed amount of mineral oil in order to obtain PB modified glassy carbon paste electrodes (PB‐GCPE's). PB‐GCPE's with different percentages of GC modified with PB (PB‐GC) were compared and the dependence on the amount of PB on their performances was evaluated by studying the parameters of cyclic voltammetry (i.e., current peak, Δ E p , anodic and cathodic current ratio, charge density) and the amperometric response to H 2 O 2 . Data interpretation based on the GC surface area is presented. GCPE's with a selected amount of PB‐GC were then tested as H 2 O 2 probes and all the analytical parameters together with the dependence on pH were evaluated. Some preliminary experiments with these electrodes assembled as glucose, lysine and lactate biosensors are also reported.