Vitamin E determination in edible oils by reversed-phase dispersive liquid-liquid microextraction and screen-printed carbon electrodes

A novel simple, environmentally friendly and portable method to determine vitamin E in edible oils based on reversed-phase dispersive liquid-liquid microextraction combined with electrochemical detection using screen-printed carbon electrodes (SPCEs) has been developed. Vitamin was extracted from oil samples into a 4 M HCl aqueous solution determined by differential pulse voltammetry SPCEs. The extraction conditions optimized experimental design (i.e., Plackett–Burman central composite designs) were: extractant volume, 43 µL; time, 2 min; centrifugation 10 speed, 3000 rpm. proposed requires standard addition calibration approach, the working range showed good linearity 0 20 mg L−1, correlation coefficient ranging 0.990 0.995 (N=5). methodological limit of between 1 3 L−1. repeatability evaluated at 15 relative deviation ranged 15% (n=5). For quantification ten commercial olive, sesame, soybean, sunflower mixture corn oils, volume phase solution) increased up 100 µL satisfactory recoveries were obtained 85–115%, confirming applicability method.