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Quantitative HPLC-MS of retinoids in a CM fraction. The top panel shows the total d4-retinyl esters (d4 Total) and d8-βC (d8bcar) whereas the bottom panel contains the individual d4-retinyl esters (RL, retinyl linoleate; RO, retinyl oleate; RP, retinyl palmitate; RS, retinyl stearate) and d8-βC for the same subject. Individual retinyl esters followed the same trend as the total retinyl esters and β-carotene with the peak concentrations of both d4-RE and d8-βC at 5–6 h postdose.
