Abstract
Carbon-paste electrode modified with Co2+-Y zeolite was used in voltammetric determination of riboflavin. Maximum anodic voltammetric current, due to the redox behavior of Co2+ ions, was observed in 0.1molL−1 KNO3 with pH 5. The modified electrode showed a catalytic behavior in electro-oxidation of riboflavin, lowering the over-potential of the reaction by ∼200mV. The effect of several parameters such as pH and concentration of the supporting electrolyte was investigated. The cyclic voltammetric response of the electrode to riboflavin was linear in the range of 1.7 to 34μmolL−1 with a detection limit of 0.71μmolL−1.
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