Electrochemical Sensing of Anions and Heparin by an Alkyl-chain Ferrocene Cationic Surfactant

KATO Ryo, SATO Akihiko, YOSHINO Daisuke, HATTORI Toshiaki

doi:10.2116/analsci.27.61

Electrochemical Sensing of Anions and Heparin by an Alkyl-chain Ferrocene Cationic Surfactant

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KATO Ryo

Cooperative Research Facility Center, Toyohashi University of Technology
SATO Akihiko

Department of Materials Science, Toyohashi University of Technology
YOSHINO Daisuke

Department of Materials Science, Toyohashi University of Technology
HATTORI Toshiaki

Department of Electric and Electronic Information Engineering, Toyohashi University of Technology

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Alkyl-chain ferrocene cationic surfactants (ACFcCS) can form ion-pair complexes with anions, and are then adsorbed at hydrophobic electrode surfaces or extracted to organic layers. The amount of adsorbed ACFcCS-anion complex is dependent on the anion concentration in a solution, and the anion concentration can be determined from the current intensity of the oxidation wave of the ferrocene part of ACFcCS. In this work, we studied the adsorption behavior of (ferrocenylmethyl)dodecyldimethyl ammonium ion (FcMDDMA) on a carbon-paste electrode, which accompanies the ion-pair formation with an inorganic anion, an organic anion, or heparin molecule. A concentration analysis of a heparin sodium injection sample was carried out using adsorption voltammetry, and the amperometric titration used FcMDDMA as the end-point indicator.