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.

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 (EOs) 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.(AU)

Volatile chemical composition and bioactivities from Colombian Kyllinga pumila Michx (Cyperaceae) essential oil / Composição química volátil e bioactividades do óleo essencial do colombiano Kyllinga pumila Michx (Cyperaceae)

The essential oil from the fresh leaves of Kyllinga pumila (Michx) was obtained by hydrodistillation and characterized by gas chromatography-mass spectrometry (GC-MS). Twenty-eight volatile compounds were identified, major constituents of the oil were Methyl E,E-10,11-epoxyfarnesoate (43.8%), -elemene (12.5%), Z-caryophyllene (11.3%), germacrene D (7.1%) and E-caryophyllene (5.6%). Repellent and fumigant activities of the oil against Tribolium castaneum Herbst (Coleoptera: Tenebrionidae), were done using the area preference method. Additionally, we studied their antioxidant and phytotoxic effects. Essential oils exhibited a dose-dependent repellent activity, with values 90% at the applied concentration (0.01%), for both two and four hours exposure. Essential oil from K. pumila showed 92% mortality at 500 L L-1 air against T. castaneum on 24 hours of exposure. The value LC50 was 153.4 L L-1. With moderate selective phytotoxic effects on L. perenne root growth (±70% inhibition). Kyllinga pumila shows high antioxidant potential (91.5%), an effect that is comparable with ascorbic acid (92.9%) used as a standard. The results indicated that K. pumila essential oil could be a promising alternative to new natural antioxidants, repellents, and biocides.(AU)

O óleo essencial das folhas frescas de Kyllinga pumila Michx., foi obtido por hidrodestilação e caracterizado por cromatografia gasosa acoplada a espectrometria de massas (CG-EM). O constituinte majoritário do óleo foi Metil E,E-10,11-epoxifarnesoato (43,8%), -elemeno (12,5%), Z-caryophylleno (11,3%), germacreno D (7,1%), E-caryophylleno (5,6%). A atividade repelente e fumigante do óleo frente à Tribolium castaneum Herbst (Coleoptera: Tenebrionidae) foi determinada pelo método da área de preferencia. Também, foi estudado os efeitos antiferrugens e fitotóxicos. Óleos essenciais exibiram uma atividade repelente dependente da dose, com valores de 90% na concentração aplicada (0,01%), tanto para duas e quatro horas de exposição. O óleo essencial de K. pumila mostrou mortalidade de 92% a 500 L L-1 ar frente à T. castananeum, em 24 horas de exposição. O valor LC50 foi 153,4 L L-1. Com efeitos fitotóxicos seletivos moderado sobre o crescimento da raíz de L. perenne (± 70% de inibição). Kyllinga pumila mostra um elevado potencial antioxidante (92%), um efeito que é comparável com ácido ascórbico (95%) usado como padrão. Os resultados indicaram que o óleo essencial K. pumila poderia ser uma alternativa promissora para novos antioxidantes, repelentes e biocidas naturais.(AU)