Simultaneous Determination of 32 Pyrrolizidine Alkaloids in Two Traditional Chinese Medicine Preparations by UPLC-MS/MS

Figure 3

PCX, SCX, X-C, C18/SCX SPE cartridges for the recovery of PAs. X-axis: 1. Em, 2. Er, 3. Eu, 4. He, 5. Ic, 6. Im, 7. Jb, 8. Lc, 9. Mc, 10. Re, 11. Sk, 12. Sn, 13. Sp, 14. Sv, 15. Td, 16.7-Ly, 17.7-Im, 18. EmNO, 19. ErNO, 20. EuNO, 21. HeNO, 22. IcNO, 23. JbNO, 24. LcNO, 25. LyNO, 26. McNO, 27. ReNO, 28. SnNO, 29. SpNO, 30. SvNO. Y-axis: 1. PCX, 2. SCX, 3. X-C, 4. C18/SCX. For the abbreviations of the compounds, see Section 2.1 Standards.