title: beta-Cyclodextrin-ferrocene inclusion complex modified carbon paste electrode for amperometric determination of ascorbic acid.
abstract: Inclusion complex of ferrocene (Fc) with beta-cyclodextrin (beta-CD) has been synthesized in ethylene glycol. It was unsolvable in water and had been successfully used to the preparation of beta-CD-Fc inclusion complex modified carbon paste electrode (CFCPE). Solid paraffin was used as the binder of the electrode. Ascorbic acid (AA) was electrocatalytically oxidized at the electrode in NH(3)-NH(4)Cl buffer (pH 10.0) with a anodic peak potential of +0.20 V (vs. SCE). The anodic current was proportional to the concentration of AA in the range 1.0x10(-3)-5.0x10(-7) mol l(-1) with the detection limit of 1.0x10(-7) mol l(-1). Using the inclusion complex as the electroactive substance greatly increased the stability and reproducibility of CFCPE than using Fc; the lifetime of the electrode can be over 1 year. Because CFCPE responds rapidly and sensitively, it has been successfully applied to the determination of AA in fruit juices.
authors.affiliation: Department of Chemistry, Shandong Normal University, Jinan 250014, People's Republic of China.
authors.forename: Z
authors.initials: Z
authors.lastname: Guorong
authors.forename: W
authors.initials: W
authors.lastname: Xiaolei
authors.forename: S
authors.initials: S
authors.lastname: Xingwang
authors.forename: S
authors.initials: S
authors.lastname: Tianling