This Application Note shows the use of the Thermo Scientific™ Dionex™ CoulArray™ Coulometric Array Detector for the measurement of a variety of lipidsoluble nutrients including vitamins A (retinol), D2 (ergocalciferol), D3 (cholecalciferol), E (a- and γ-tocopherol), and K1 (phylloquinone), along with carotenoids (a- and b-carotene), retinoids (retinyl palmitate), tocopheryl acetate, and coenzyme Q10 (ubiquinone) (Figure 1). The analysis of multivitamin tablets, infant formula and milk are given as examples.