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The gelsemium plants are highly poisonous but toxicological evaluation of suspected poisoning cases has been hampered by the chemical complexity of the gelsemium toxins involved. A novel liquid chromatography-tandem mass spectrometry protocol was optimized for the collective detection of gelsemine and related alkaloids from Gelsemium elegans. The screening protocol was applied to the clinical investigation of unexplained intoxications following the ingestion of seemingly nontoxic herbs. In three clusters of toxicological emergencies ranging from severe dizziness to respiratory failure, Gelsemium elegans mistaken for various look-alike therapeutic herbs was suspected to be the hidden cause of poisoning. Nine cases of gelsemium poisonings were thus ascertained by the diagnostic urine alkaloid profiles. Gelsemine was sustained as the main urinary marker of Gelsemium exposure.

Confirmation of Gelsemium Poisoning by Targeted Analysis of Toxic Gelsemium Alkaloids in Urine