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ABSTRACTIn this study, we evaluated the chemical composition and the in vitroanthelmintic efficacy of the essential oils (EOs) of the plants Aloysia triphylla, Adenocalymna alliaceum, Allium sativum, Croton cajucara(white and red morphotypes), Curcuma longa, Lippia gracilis, Lippia origanoides, Ocimum gratissimum, Mentha arvensis, and Piper aduncumagainst the Acantocephalan Neoechinorhynchus buttnerae. The in vitroviability of worms was observed after 24 h-exposure to nine concentrations of EOs from each plant. Lower EC50values were obtained for M. arvensis, L. origanoides, L. gracilis, C. cajucara(red and white morphotypes), O. gratissimum, and P. aduncum. All EOs showed 100% anthelmintic efficacy in vitroin 24 h. In regard to damage to the integument of helminths, edema in the lacunar spaces with formation of bubbles in the subcuticle, body swelling, increased volume of the pseudocelomatic cavity and degeneration of the reproductive organs were observed after exposure to A. triphyllaOE.

ABSTRACTThe chemical composition of the essential oils of Mentha arvensisand Mentha piperitaand their antimicrobial activity against twelve Aeromonasspp. isolates from tambaquis (Colossoma macropomum), an important native farmed fish species in Brazil, were evaluated. The oils were characterized using gas chromatography and mass spectrometry (GC/MS) and their antimicrobial activity was evaluated through the microdilution method. The essential oils of these Menthaspecies mainly comprised oxygenated monoterpenes (97.1% for M. arvensisand 86.2% for M. piperita) and menthol was the major compound of these oils (86.1% for M. arvensisand 33.8% for M. piperita). It was confirmed that these oils had antimicrobial activity against 12 isolates of Aeromonasspp., with minimum inhibitory concentration (MIC) and minimum bacterial concentration (MBC) ranging from 1,250 to 16,666.7 μg mL−1. Better antimicrobial activity was achieved by the M. arvensisessential oil.