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Applied Biological Chemistry
Fig. 4 | Applied Biological Chemistry

Fig. 4

From: A LC–ESI–MS/MS analysis procedure coupled with solid phase extraction and MeOH extraction method for determination of pyrrolizidine alkaloids in Tussilago farfara and Lithospermi erythrorhzion

Fig. 4

Matrix effects of 28 pyrrolizidine alkaloids in Farfarae Flos and Lithospermi Radix; 1: Echimidine, 2: Echimidine-N-oxide, 3: Erucifoline, 4: Erucifoline-N-oxide, 5: Europine, 6: Europine-N-oxide, 7: Heliotrine, 8: Heliotrine-N-oxide, 9: Intermedine, 10: Intermedine-N-oxide, 11: Jacobine, 12: Jacobine-N-oxide, 13: Lasiocarpine, 14: Lasiocarpine-N-oxide, 15: Lycopsamine, 16: Lycopsamine-N-oxide, 17: Monocrotaline, 18: Monocrotaline-N-oxide, 19: Retrorsine, 20: Retrorsine-N-oxide, 21: Senecionine, 22: Senecionine-N-oxide, 23: Seneciphylline, 24: Seneciphylline-N-oxide, 25: Senecivernine, 26: Senecivernine-N-oxide, 27: Senkirkine, 28: Trichodesmine

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