Abstract
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. glutinosa were germacrene D (4.8%), limonene (5.2%), a-terpineol (6.5%), b-pinene (8.5%), nerolidyl acetate (9.8%), and trans-nerolidol (34.6%). S. glutinosa showed antioxidant potential (85.8%) (IC50=142.49 µg mL-1). The EO deployed repellent activity against the Tribolium castaneum weevil at a concentration of 15.73 nL cm-1 at 2 hours of exposure (72%), while the result for the commercial repellent was 50% at the same concentration. EO from S. glutinosa displayed the best fumigant activity with LC50 of 153.4 μg mL-1 air. The essential oil from S. glutinosa can be considerated as a natural source of biocides and antioxidants.
Highlights
We investigated the volatile chemical composition and antioxidant property of EOs isolated from the peel of S. glutinosa grown in Colombia, as well as their repellent and fumigant activities against the T. castaneum using in vitro bioassays
The repellent activity of DEET was highest at 78.63 nL cm-2 (76% at 2 hours). These results show that the EO of S. glutinosa exhibited a repellent activity close to that of the commercial repellent
Repellent and fumigant in vitro activities exhibited by the EO from S. glutinosa (Blanco) Merr., increasing interest in the possible application of essential oils as biocides in the control of insects and as protection of products against oxidation
Summary
The presence of insects in stored grain requires the development and implementation of new naturally occurring agrochemicals for the control and eradication of these harmful pests (Nenaah, 2014). One of the main groups of plague insects, economically important, that affect post-harvest products are Coleoptera beetles. Among them are the red flour beetles, Tribolium castaneum (Herbst) (Coleoptera: Tenebrionidae); these beetles act as secondary pests attacking already damaged grains or grain products. They can be found in almost all storage containers of cereals or cereal products, especially in tropical and subtropical climates; they attack corn, wheat, and flour, among others (Jaya, Singh, Prakash, & Dubey, 2014)
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