Figure 6. Portions of the HPLC chromatograms from the retinyl palmitate studies

This figure shows the relative areas of the peaks for tocopherol (green), used as the internal standard, and retinyl palmitate (orange), after exposure to 5 MED; formulation a) without EHMC lost 65% of its retinyl palmitate, while formulation b) with 4% EHMC lost less than 5%; the peaks for the E and Z isomers of EHMC are shown in yellow.