Abstract
Hyptis dilatata and Mesosphaerum suaveolens belong to Lamiaceae, are aromatic and medicinal subshrubs with antiparasitic potential and occurrence in the Amazon Region. The essential oils of both species were extracted, analyzed, and identified by GC and GC–MS and then evaluated their anthelmintic activities against the nematode Caenorhabditis elegans. Primary constituents of the samples of H. dilatata oils were limonene (72.6%), myrcene (11.5%), and p-cymene (10.3%) to PAMA19 sample, and camphor (25.5%), α-pinene (25.4%), 1,8-cineole (18.8%), β-pinene (12.0%), and limonene (5.9%) to PAMA108 sample, while in the oil of M. suaveolens, PAMA131 sample, predominated bicyclogermacrene (23.5%, 1,8-cineole (23.0%), germacrene D (17.2%), and (E)-caryophyllene (10.4%). The sample oil of H. dilatata (PAMA108) exhibited the lower anthelmintic inhibitory concentration, with an IC50 value of 2.09 mg/mL for C. elegans Bristol N2 strain, while the oils of H. dilatata (PAMA19) and M. suaveolens (PAMA131) showed an IC50 up of 4 mg/mL for C. elegans IVR15 and Bristol N2 strains. These results suggest that the H. dilatata and M. suaveolens oils constituents' combination can be helpful as a nematicidal agent due to their synergistic action.
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