Fig. 1.
Concentration of essential oil in A. annua fresh biomass according to distillation time. Concentration of artemisinin in the plant residue from the distillation from 9 different distillation times plus non-distilled control (0 distillation time). Artemisinin was extracted by an accelerated solvent extraction system (ASE 350), and estimated to be 1.15% in leaves as extracted by ASE 350 using petroleum ether as a solvent. Bars on top of columns represent standard error of the means (n = 3). Capital letters indicate difference or similarity between treatments