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Impatiens balsamina  L. (Balsaminaceae), an annual herb found throughout China, has been extensively used in traditional Chinese medicine (TCM). However, our knowledge regarding the adverse effects of  I. balsamina  in vivo is very limited. In this present study, the nematode  Caenorhabditis elegans  model was employed to fully assess the adverse effects of hydroalcoholic (EtOH 55%) extracts of  I. balsamina  stems (HAEIBS) in vivo. After exposure to 10 mg/mL HAEIBS, the major organism-level endpoints of  C .  elegans  of percent survival, frequency of head thrash and body bends, and reproduction had decreased by 24%, 30%, and 25%, respectively. The lifespan of  C. elegans  was also greatly reduced after HAEIBS exposure compared to the controls. The active compounds in HAEIBS were separated using high speed countercurrent chromatograph (HSCCC) and characterized by high performance liquid chromatography (HPLC) and nuclear magnetic resonance (NMR). Two compounds, lawsone and 2-methoxy-1,4-naphthoquinone (MNQ), and their adverse effects were then more thoroughly detailed in this study. It was found that lawsone is the major toxin in HAEIBS with a higher toxicity than MNQ in terms of negative impact on  C. elegans  mortality, locomotion, reproduction, and lifespan. Our data also suggests that the  C. elegans  model may be useful for assessing the possible toxicity of other Chinese medicines, plant extracts, and/or compounds.

Adverse Effects of Hydroalcoholic Extracts and the Major Components in the Stems ofImpatiens balsaminaL. onCaenorhabditis elegans