FIGURE 1.

Structure of lycopene (A), representative chromatogram of ¹³C-lycopene monitored at 470 nm (B), and the calculated ¹³C-isotopologue distribution in ¹³C-lycopene used for dosing (C). The percentage of isotopologue abundance was calculated from mass chromatogram peak areas of all-E + 5-Z-lycopene isotopologues masses from an m/z = 535.5 (the mass of unlabeled lycopene + 1 mass unit for H⁺ as a result of the analysis being conducted in positive ion mode) to m/z = 577.5 (the mass of uniformly labeled ¹³C-lycopene + 1 mass unit for H⁺ as a result of the analysis being conducted in positive ion mode). AU, arbitrary units.