Fig. 2.
Extraction of artemisinin from A. annua leaves from a control sample, by Sohxlet with water (deionized, distilled), to mimic artemisinin extraction during steam distillation. Artemisinin from the aqueous phase was obtained by partitioning with petroleum ether (light columns), while artemisinin from leaf residue from Sohxlet extraction was extracted by 1-h refluxing in petroleum ether (dark columns). Bars on top of columns represent standard errors of the means (n = 3). Capital letters indicate difference or similarity between treatments.