Volatile chemical composition of Piper sancti-felicis Trel essential oil and its biocidal action against Tribolium castaneum (Herbst)

This research assessed the fumigant activity of the essential oil from Piper sancti-felicis Trel and five of its components on the Tribolium castaneum (Herbst) biological model. Hydrodistillation was used for extraction of the essential oil, with separation and identification of the compounds through gas chromatography coupled to mass spectrometry (GC-MS). The fumigant was evaluated through gas dispersion on the T. castaneum. The majority compounds found in the EO were b-nerolidol (15.4%), 3-carene (14.9%), p-cymene (9.1%), spathulenol (8.2%), a-cubebene (6.2%) and calamenene (5.2%). Piper sancti-felicis displayed fumigant activity with a LC50 = 108.5 & 956;g L-1 air, and other individual monoterpenes tested such as & 945;-terpinolene (LC50 = 110.1 & 956;g L-1 air), p-cymene (LC50 = 120.3 & 956;g L-1 air), 3-carene (LC50 = 130.6 & 956;g L-1 air), (R) -limonene (CL50 = 189.6 & 956;g L-1 air), and a-pinene (LC50 = 213.1 & 956;g L-1 air), were significantly less toxic than methyl pyrimiphos used as a positive control, CL50 = 87.4 & 956;g L-1 air. The essential oil of P. sancti-felicis can be considered as a natural source of biocides.

Antioxidant and biological activities of essential oil from Colombian Swinglea glutinosa(Blanco) Merr fruit

The objectives of this work were the study of the volatile chemical composition of essential oils (EO’s) from Swinglea glutinosa, as well as to evaluate their antioxidant, repellent and fumigant properties. The EO was obtained by hydrodistillation from the peel of the fruit, gathered in the city of Cartagena, Bolívar (Colombia). The volatile composition was analyzed by gas chromatography coupled to mass spectrometry (GC-MS). The major compounds found in S. glutinosaweregermacrene D (4.8%), limonene (5.2%),-terpineol (6.5%), -pinene (8.5%), nerolidyl acetate (9.8%), and trans-nerolidol (34.6%). S. glutinosashowed antioxidant potential (85.8%) (IC50=142.49 μg mL-1). The EO deployedrepellent activity against the Tribolium castaneumweevil at a concentration of 15.73 nL cm-1at 2 hours of exposure (72%), while the result for the commercial repellent was 50% at the same concentration. EO from S. glutinosadisplayed the best fumigant activity withLC50of 153.4 μg mL-1air. The essential oil from S. glutinosacan be considerated as a natural source of biocides and antioxidants.