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The steam distillation applied to the aerial parts of  Pterocaulon polystachyum  DC (Asteraceae) afforded essential oil and an aqueous residue, which is a by-product usually considered a waste. In this study, the prospects for using both essential oil and aqueous waste were investigated, showing new directions for the industrial process. The essential oil had its composition determined and showed activity against  Microsporum gypseum  (Bodin) Guiart &amp; Grigorakis. The residual distillation water, which also had some activity against the same fungus, showed the presence of phenolic acids and a small amount of coumarins, molecules with interest in the pharmaceutical and food industries. In addition, the extraction curve was modeled mathematically.

plant biosystems - an international journal dealing with all aspects of plant biology

Essential oil and residual distillation water of  Pterocaulon polystachyum  DC: composition, antifungal activity, and mathematical modeling of steam distillation