Determination of Riboflavin at Carbon Nanotube Paste Electrodes Modified with an Anionic Surfactant

A Sodium lauryl sulfate modified carbon nanotube paste electrode (SLSMCNTPE) was fabricated for the electroanalysis of Riboflavin (RF) in phosphate buffer solution (PBS) at pH, 7.0 by cyclic voltammetry (CV). The electrode was found to be a very sensitive tool for detection of RF; it was shown that SLSMCNTPE yields a high current response towards RF as compared to the bare carbon nanotube paste electrode (BCNTPE). Key parameters were optimized for RF determination. The effects of surfactant concentration, pH, scan rate and concentration of RF on the oxidation peak current values were determined. The RF oxidation peak appeared at −440 mV and reduction peak at −575 mV vs. saturated calomel electrode (SCE). The SLSMCNTPE revealed good repeatability, reproducibility, stability, high electrochemical sensitivity in its voltammetric response and a detection limit of 9.25×10‐8 M.