Multi-walled carbon nanotube modified glassy carbon electrode as curcumin sensor

A facile and efficient voltammetric sensing platform was described for curcumin analysis based on the adsorptive stripping voltammetry using multi-walled carbon nanotube modified glassy carbon electrode. As a result of the open-circuit accumulation of curcumin on the fabricated electrode surface, the described analytical procedure was shown to be a sensitive technique for curcumin analysis by increasing the sensitivity of the glassy carbon electrode. A good linear calibration curve in the range of 0.010–5.000 µM (R² = 0.9967) was obtained. The repeatability of the methodology was quite satisfactory. The detection and quantification limits were found as 0.005 and 0.014 µM, respectively. The methodology was successfully applied to determine the curcumin equivalent in a turmeric extract following the ultrasound-assisted extraction of a turmeric powder. The ultrasound-assisted extraction had a good recovery value between 103.5 and 106.0%. The described methodology would be a facile, sensitive, and cheap alternative to the current methods for curcumin analysis. Graphic abstract: