Voltammetric Bahavior of Ferricyanide Ion-confined LbL Film-coated Electrodes: Use of Heparin and K-Carrageenan as Film Component

• Published in: International journal of electrochemical science 2012-08, Vol.7 (8), p.6762-6770
• Main Authors: Takahashi, Shigehiro, Sato, Takahiro, Haraguchi, Nobuhiro, Wang, Baozhen, Anzai, Jun-ichi
• Format: Article
• Language: English
• Subjects: carrageenan; ferricyanide ion; heparin; layer-by-layer film; polysaccharide
• ISSN: 1452-3981; 1452-3981
• DOI: 10.1016/S1452-3981(23)15745-2

Heparin (HEP) and κ-carrageenan (CAR) were used for constructing thin films on the surface of a gold (Au) electrode and redox properties of ferricyanide ions, Fe(CN)63-, on the film-coated electrodes were studied. HEP- and CAR-containing thin films were successfully prepared by layer-by-layer (LbL) deposition of the polysaccharides and poly(allylamine hydrochloride) (PAH). Fe(CN)63- ions penetrated the LbL-deposited films to exhibit redox reactions on the Au electrodes when the outermost surface of the film was covered with PAH. On the other hand, penetration of Fe(CN)63- ions was suppressed when the surface of the film was covered with HEP or CAR. The results were rationalized on the basis of electrostatic repulsion between Fe(CN)63- anion and negative charges in HEP and CAR. In addition, Fe(CN)63- ions were confined in the LbL films and the confined Fe(CN)63- ions were successfully used for the electrocatalytic oxidation of ascorbic acid.