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Molecules 2011, 16(2), 1695-1709; doi:10.3390/molecules16021695

Eucalyptus oleosa Essential Oils: Chemical Composition and Antimicrobial and Antioxidant Activities of the Oils from Different Plant Parts (Stems, Leaves, Flowers and Fruits)

1
Laboratoire de Physicochimie des Matériaux, IPEST, BP51, La Marsa 2070, Tunisia
2
Unité de Modélisation, Analyse et Commande des Systèmes, Ecole Nationale d’Ingénieur, 6029 Gabés, Tunisia
3
Laboratoire Génie Chimique, UMR 5503 (CNRS/INPT/UPS), Université de Toulouse, INP/ENSAT, Avenue de l'Agrobiopole, BP 32 607, Auzeville-Tolosane, F-31326 Castanet-Tolosan Cedex, France
4
Laboratoire des Interactions Moléculaires et Réactivité Chimique et Photochimique, UMR CNRS 5623, Université de Toulouse, 118 route de Narbonne, F-31062 Toulouse, France
5
Laboratoire d'Ecologie, INRGREF, B.P10, Ariana 2080, Tunisia
*
Authors to whom correspondence should be addressed.
Received: 19 January 2011 / Revised: 24 January 2011 / Accepted: 17 February 2011 / Published: 17 February 2011
(This article belongs to the Collection Bioactive Compounds)
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Abstract

Essential oils obtained by hydrodistillation from the different parts (stems, adult leaves, immature flowers and fruits) of Eucalyptus oleosa were screened for their antioxidant and antimicrobial properties and their chemical composition. According to GC-FID and GC-MS, the principal compound of the stem, immature flowers and the fruit oils was 1,8-cineole, representing 31.5%, 47.0% and 29.1%, respectively. Spathulenol (16.1%) and γ-eudesmol (15.0%) were the two principal compounds of adult leaves oil. In the DPPH (1,1-diphenyl-2-picrylhydrazyl) assay, the oils of the four parts showed moderate antioxidant activity. In the ABTS (2,2’-azinobis-3-ethylbenzothiazoline-6-sulphonate) assay, the most active part was the adult leaves, with a IC50 value 13.0 ± 0.6 mg/L, followed by stems (IC50 = 43.5 ± 1.4 mg/L). The essential oils showed a better antibacterial activity against Gram-positive and Gram-negative bacteria, and a significant antifungal activity also was observed against yeast-like fungi. A strong correlations between oxygenated monoterpenes and antimicrobial activity (especially 1,8-cineole) were noted (R2 = 0.99, 0.97 and 0.79 for B. subtilis, P. aeruginosa and C. albicans, respectively).
Keywords: Eucalyptus oleosa F. Muell. ex Miq.; plant parts; essential oil; GC-MS; antioxidant activity; ABTS; DPPH; antimicrobial activity Eucalyptus oleosa F. Muell. ex Miq.; plant parts; essential oil; GC-MS; antioxidant activity; ABTS; DPPH; antimicrobial activity
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Marzoug, H.N.B.; Romdhane, M.; Lebrihi, A.; Mathieu, F.; Couderc, F.; Abderraba, M.; Khouja, M.L.; Bouajila, J. Eucalyptus oleosa Essential Oils: Chemical Composition and Antimicrobial and Antioxidant Activities of the Oils from Different Plant Parts (Stems, Leaves, Flowers and Fruits). Molecules 2011, 16, 1695-1709.

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