Surfactant Immobilized Electrochemical Sensor for the Detection of Indigotine

A highly sensitive electrochemical sensor for Indigotine (IG) detection was fabricated at a carbon paste electrode (CPE) modified with TX-100 surfactant. The electrochemical behavior of IG was studied at TX-100 modified carbon paste electrode (TX100MCPE). The effect of different pH values, scan rate and effect of concentration was also studied using cyclic voltammetry. It was noticed that under optimized condition (pH 6.5) a well -defined redox peak with the higher current response was obtained for IG at TX100MCPE compare to bare carbon paste electrode (BCPE). The modified electrode exhibited an excellent electrochemical activity towards the oxidation of IG. The electrochemical response of IG is linearly observed in the range of 1.5×10-6 M to 2×10-5 M, with the detection limit and limit of quantification of 16×10-8 M and 5.3×10-7 M. The modified electrode showed good sensitivity (0.085 µA/µM) and stability and was employed for the determination of IG in the real sample.