PARTICLE SIZE EFFECTS ON ANTIOXIDANT POTENTIAL AND LARVICIDAL EFFICACY OF ESSENTIAL OIL FROM Lippia chevalieri (Mold) LEAVES ON Anopheles gambiae s.l. (Diptera: Culicidae) - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue ISAR Journal of Multidisciplinary Research and Studies Année : 2024

PARTICLE SIZE EFFECTS ON ANTIOXIDANT POTENTIAL AND LARVICIDAL EFFICACY OF ESSENTIAL OIL FROM Lippia chevalieri (Mold) LEAVES ON Anopheles gambiae s.l. (Diptera: Culicidae)

Résumé

A new approach to enhancing plant activities is encouraged. Fresh leaves of Lippia chevalieri were dried, ground and fractionated into granulometric classes (≤ 212 μm; 212 - 425 μm; ≥ 425 μm) by sieving. The essential oils (EOs) were analyzed by gas chromatography (GC) coupled with mass spectrometry (MS). Antioxidant activity was evaluated using the 2,2-diphenyl-1-picrylhydrazyl (DPPH) and ferric reducing antioxidant power (FRAP) tests. Larvicidal efficacy was tested on Anopheles gambiae s.l. under laboratory conditions. Particle size had a significant influence (p < 0.05) on the phytocompounds, antioxidant and larvicidal properties of the EOs. Comparatively, the number of phytochemicals decreases as we move towards fine particles. The ≤ 212 μm EO fraction exhibited higher DPPH (IC50 = 78.2 ± 2.24 μg/mL) and FRAP (48.72 ± 0.028 mgAAE/gEO) activities than did ascorbic acid. Fresh leaves, dry leaves, unsieved powder and large particles (≥ 425 μm) induced significant (P < 0.05) concentration-dependent larvicidal activity, with LC50s of 1,93, 1.55, 1.68 and 2.11 mg/mL, respectively. Grinding followed by sieving results in the accumulation of the majority of antioxidant compounds in the EO of fine particles. Drying and grinding increases the larvicidal efficacy of the plant, while fractioning into fine particles progressively reduces the efficacy as a function of particle size.
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Dates et versions

hal-04511704 , version 1 (19-03-2024)

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  • HAL Id : hal-04511704 , version 1

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Foko Dadji Gisele Aurelie, Elie Njantou Baudelaire, François Muanda Nsemi, Damas Dainone Ignareki, Nicolas Yanou Njintang, et al.. PARTICLE SIZE EFFECTS ON ANTIOXIDANT POTENTIAL AND LARVICIDAL EFFICACY OF ESSENTIAL OIL FROM Lippia chevalieri (Mold) LEAVES ON Anopheles gambiae s.l. (Diptera: Culicidae). ISAR Journal of Multidisciplinary Research and Studies, 2024, 2 (2), pp.22-30. ⟨hal-04511704⟩
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