Citronella Extracts: Chemical Composition, In Vivo and In Silico Insecticidal Activity against Fall Armyworm (Spodoptera frugiperda J.E Smith) | ||||
| Egyptian Journal of Chemistry | ||||
| Volume 66, Issue 7, July 2023, Page 235-243 PDF (830.41 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejchem.2022.147926.6441 | ||||
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| Authors | ||||
Syadza Firdausiah  1; Firdaus Firdaus1; Sulaeha Sulaeha2; Herlina Rasyid1; Siti Fatima Amalia1
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| 1Chemistry Department, Faculty of Mathematics and Natural Sciences, Hasanuddin University, Perintis Kemerdekaan Street KM 10 Tamalanrea Indah, Makassar, 90245, Indonesia | ||||
| 2Department of Pests and Plant Diseases, Faculty of Agriculture, Hasanuddin University, Perintis Kemerdekaan Street KM 10 Tamalanrea Indah, Makassar, 90245, Indonesia | ||||
| Abstract | ||||
| Citronella (Cymbopogon nardus L.) is a widely used plant in medicinal and agrochemical fields due to its unique secondary metabolite, citronellal. In this study, the chemical composition of citronella stem extract and its biopesticide activity against fall armyworm (Spodoptera frugiperda) was studied. Extraction of citronella with 96% ethanol was carried out using three methods, namely maceration, soxhletation, and microwave-assisted extraction (MAE). The chemical content in the extracts was analyzed using a GC-MS instrument. The potential of the extract as a biopesticide was carried out using the Completely Randomized Design (CRD) method by treating instar III larvae to citronella stem extract with a concentration of 0.5%; 1.0%; 1.5%; 2.5%; and 3.5% in triplicate. Data were analyzed using SPSS probit analysis. In silico computational study was done through molecular docking analysis. The results showed that the soxhletation method successfully obtained the highest citronellal percentage, 0.28%, compared to maceration (0.03%) and MAE (0.02%). Three citronellal compounds were detected in the extracts, namely citronellol, geranyl acetate, and hydroxy citronellol. The ethanol extract obtained by the soxhletation method was powerfully effective as a biopesticide with an LC50 of 0.456% in 12 hours of observation. Molecular docking analysis showed that all citronellal compounds contained in the extract had a binding energy lower than -5 kcal/mol indicating a potential bioactivity. Hydroxy citronellol had the lowest binding energy about -5.81 kcal/mol and two hydrogen bond interactions in Arg314 and Phe313 residues. It can be concluded that ethanolic extract of citronella stem can be used as a biopesticide, particularly against fall armyworm (Spodoptera frugiperda). | ||||
| Keywords | ||||
| Biopesticide; Cymbopogon nardus L; molecular docking; natural insecticide; soxhletation | ||||
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