Abstract
The present work demonstrates the development of functionalized carbon nanofiber and carbon nanotube composite paste electrode towards the electrochemical analysis of riboflavin (RF) in 0.2 M phosphate buffer solution of pH 7.0 in the presence of ascorbic acid. RF shows the enhanced electrochemical reaction at the modified electrode surface with well-resolved and distinct redox peaks than bare carbon nanotube paste electrode. The material characteristics were analyzed using field emission scanning electron microscopy, X-ray powder diffraction, electrochemical impedance spectroscopy, and cyclic voltammetry methods. The proposed electrode gives a fine linear relation between the concentration of RF and oxidation peak current in the linear range of 5.0-60.0 mu M with the limit of detection of 15.35 nM and limit of quantification of 51.18 nM. Also, the sensing capability of the electrode for RF analysis was tested in B-complex capsule with fine recoveries. Graphic abstract