Voltammetric determination of curcumin in spices

Curcumin is oxidized on a glassy carbon electrode in 0.1 M LiClO4 in ethanol at the potential 0.74 V. The calibration graph is linear in the range 9.9 x 10(-6)-1.07 x 10(-4) M curcumin; the detection limit is 4.1 x 10(-6) M. Curcumin is determined in model solutions. The relative standard deviation does not exceed 0.05. A procedure is proposed for the voltammetric determination of curcumin in spices. It was shown that single extraction by ethanol quantitatively recovers curcumin from spices.