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Fe(CN) $\rm{ {_{6}^{4-}}}$ ‐Doped‐Glutaraldehyde‐Cross‐Linked Poly‐ L ‐Lysine Film Electrode. Part 1: Electrochemical Characterization and Its Electrocatalytic Activity Towards Oxidation of Ascorbic Acid
Author(s) -
Wu YuChing,
Thangamuthu R.,
Chen ShenMing
Publication year - 2009
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.200804497
Subject(s) - ascorbic acid , glutaraldehyde , electrochemistry , cyclic voltammetry , electrode , glassy carbon , inorganic chemistry , electrolyte , chemistry , supporting electrolyte , nuclear chemistry , materials science , organic chemistry , food science
The present work describes preparation, characterization, and electrocatalytic behavior of a hexacyanoferrate‐doped‐glutaraldehyde‐cross‐linked poly‐ L ‐lysine (PLL‐GA‐Fe(CN) $\rm{ {_{6}^{4-}})}$ film modified glassy carbon electrode. The modified electrode has been successfully prepared by electrostatically binding negatively charged Fe(CN) $\rm{ {_{6}^{4-}}}$ mediator into cross‐linked poly‐ L ‐lysine cationic film. The dependence of the peak current of the modified electrode in pure supporting electrolyte (pH 6.8 phosphate buffer solution; PBS) shows that the charge transport in the film is fast and relatively unimpeded at lower scan rates. Cyclic voltammetry and rotating disk electrode (RDE) techniques are used to investigate the electrocatalytic activity of modified electrode towards oxidation of ascorbic acid. The rate constant (k), of catalytic reaction between electrogenerated Fe(CN) $\rm{ {_{6}^{3-}}}$ ions and ascorbic acid, obtained from RDE analysis was found to be 5.53×10 5 cm 3 mol −1 s −1 . Finally, the PLL‐GA‐Fe(CN) $\rm{ {_{6}^{4-}}}$ film electrodes are successfully used for the individual estimation of ascorbic acid in the concentration range of physiological interest.