Abstract: A multi-walled carbon nanotubes modified electrode was fabricated and its electro-catalytic activity for nicotinamide was investigated. The effects of electrolyte type and acidity, scanning rate on the voltammetric behavior of nicotinamide were studied to acquire optimal conditions for detecting nicotinamide. In 0.1 mol/L phosphate buffer (pH 6.8), the differential pulse voltammetric determination displayed excellent linearity between reduction current and nicotinamide concentration in the range of 5.0×10-5 to 1.1×10-3 mol/L with a detection limit of 2.49×10-5 mol/L. Several ions, sugar and ethanol did not interfere with the determination.

Key words: glassy carbon electrode modified with multiwall carbon nanotube, nicotinamide, electrochemical