Abstract :
[en] This work is part of the global context of valorization of the biodiversity of aromatic plants from Senegal.
The aim of the study is to determine the chemical composition of essential oils (EOs) of Mentha arvensis L. and
to evaluate their antioxidant and insecticidal activities. For this purpose, leaves of M. arvensis were harvested in
Dakar region, Senegal and dried in the shade. EOs were extracted by steam distillation from dried leaves and
analyzed by gas chromatography (GC) coupled to a flame ionization detector (FID) and a mass spectrometer
(MS). The antioxidant activity of EOs was assessed using the 2,2-diphenyl-1-picrylhydrazyl (DPPH) method
while the insecticidal activity was tested by fumigation against Sitophilus zeamais(Motsch.). The results revealed
that EOs were dominated by menthol (68.4%), menthyl acetate (16.9%) and menthone (5.0%). The antioxidant
activity assay showed that the inhibition increased with the concentration: 38%, 57% and 73% for 10, 25 and 50
mg/ml, respectively; the IC50 was of 19.5 mg/ml. The oils were also effective as insecticide. Mortalities were
low after 24 hours and increased strongly after 48 hours with a maximum of 92%. They reached a maximum of
98% for 5 and 25 µl and 100% for 50 and 75 µl after 72 hours
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