Electrochemical determination of vitamin B6 in water and juice samples using an electrochemical sensor amplified with NiO/CNTs and Ionic liquid

Abstract

Measurement of food additives helps a lot to check the food quality. Also, Vitamin B6 is one of the most important vitamins in food samples. In this study, we fabricated an electroanalytical food sensor based on the amplification of a carbon paste electrode (CPE) as well as NiO-CNTs nanocomposite and 1-methyl-3-octylimidazolium hexafluorophosphate (MOHFPE). The NiO-CNTs/MOHFPE/CPE showed the catalytic activity for the determination of vitamin B6 and also improved the oxidation current of vitamin B6 up to about 2.5 times. Also, in comparison to CPE, the oxidation potential of vitamin B6 was shifted to a negative value of about 100 mV, which confirmed the successful modification of CPE with NiO-CNTs and MOHFPE. The results related to differential pulse voltammetric (DPV) investigations showed a linear between the current and vitamin B6 concentrations in the range of 4.0 nM-500 μM with a detection limit of 0.9 nM. The NiO-CNTs/MOHFPE/CPE, as an analytical tool, was successfully used to determine vitamin B6 in drinking and juices samples using the standard addition method.