Table 1.
Measured theoretical and accurate masses of the targeted carotenoids in E. denticulatum, S. polycystum and C. lentillifera by Orbitrap-MS (identity was confirmed by standard compound).
| Peak | Retention time (min) | Selected ion | m/za experimental | m/za observed | Error (ppm) | Compounds |
|---|---|---|---|---|---|---|
| 1 | 17.99 | [M + H–H2O]+ | 641.42005 | 641.41809 | -3.05 | Fucoxanthin |
| 2 | 20.11 | [M + H–H2O]+ | 551.42474 | 551.4237 | -3.21 | Lutein |
| 3 | 19.10 | [M + H]+ | 597.39384 | 597.39185 | -2.52 | Astaxanthin |
| 4 | 21.17 | [M + H]+ | 565.40401 | 565.40167 | -3.05 | Canthaxanthin |
| 5 | 20.14 | [M]+• | 568.42803 | 568.42560 | -3.31 | Zeaxanthin |
| 6 | 22.50 | [M]+• | 552.43311 | 552.43036 | -3.99 | β-Cryptoxanthin |
a
m/z (relative abundance).