Voltammetric determination of vitamin B6 in food samples and dietary supplements

• 3 commercial screen-printed electrodes evaluated to determine vitamin B6 in foods.
• Screen-printed electrodes are convenient alternative to conventional ones.
• No problem of fouling and surface regeneration thanks to the sensor disposability.
• Faster, simpler, cheaper method than other more popular techniques.

A simple and rapid voltammetric method based on the use of disposable screen-printed electrodes is proposed for the determination of vitamin B6. The influence of the pH on the voltammetric response was analyzed. Estimation of the linear range (2.0 × 10−6/7.2 × 10−5 M), calibration function, limit of detection (1.5 × 10−6 M) and reproducibility was performed along with the determination of possible interferences from species present in real samples. The proposed analytical system was successfully applied for the determination of pyridoxine in multivitamin supplements, energy drinks and breakfast cereals by using the standard addition method.