Electrochemical Determination of Ascorbic Acid Using Modified Glassy Carbon Electrode by Multiwall Carbon Nanotube-Nafion in Chloroacetic Acid Media

Abstract

Ascorbic acid (AA) is used in large scale as an antioxidant in food, animal feed, beverages, pharmaceutical formulations and cosmetic applications.Ascorbic acid is the major soluble antioxidant found in plants and is also an essential component of human nutrition 1 .In addition, ascorbate is important for neuronal maturation and function, as well as for protection of the brain against oxidant stress, is well supported by previous work 2 .In view of the great importance and wide use of ascorbic acid, numerous analytical techniques have been proposed for its determination in different matrices and at different levels.These include flow injection (FI) analysis 3 , chromatography 4 , spectrophotometry 5,6 and voltammetry [7][8][9] .Ascorbic acid can be measured using voltammetry methods in order to gain the advantages of high sensitivity and selectivity.Recently, polymer films modified electrodes have been receiving extensive interest due to their wide applications in the fields of chemical sensors and biosensors.Polymermodified electrodes have many advantages in the detection of analytes because of its high selectivity, sensitivity and