Eucalyptus (gracilis, oleosa, salubris, and salmonophloia) Essential Oils: Their Chemical Composition and Antioxidant and Antimicrobial Activities

Abstract

Essential oils of four different Eucalyptus species (Eucalyptus salubris, Eucalyptus salmonophloia, Eucalyptus oleosa, and Eucalyptus gracilis) grown in southern Tunisia were screened for their antioxidant and antimicrobial properties as well as their chemical compositions. According to gas chromatography-flame ionization detection and gas chromatography-mass spectrometry analysis, chemical compositions of the Eucalyptus species E. salubris (27 compounds; 99.2%), E. salmonophloia (31 compounds; 99.2%), E. oleosa (32 compounds; 97.6%), and E. gracilis (18 compounds; 97.7%) were identified. In the 1,1-diphenyl-2-picrylhydrazyl assay, the antioxidant activity was in the range of 12.0-52.8 mg/mL, whereas in the 2,2'-azinobis-3-ethylbenzothiazoline-6-sulfonate assay, E. oleosa (176.5 +/- 3.1 mg/L) gave the best inhibition result. To evaluate antimicrobial activity, all essential oils were tested against bacteria (two Gram-positive and two Gram-negative), two yeast, and two fungi. Essential oils exhibited an interesting antibacterial activity against all microorganisms tested (activity was better against Gram-positive bacteria) except for Staphylococcus aureus and Escherichia coli. Correlations between chemical composition and biological and antioxidant activities were studied.

A Comparative Study of the Chemical Composition of the Essential oil from Eucalyptus globulus Growing in Dehradun (india) and Around the World

“…Essential oil has been cultivated for medicinal oil production in many parts of the world. Numbers of reports are available all around the world which shows the antibacterial [8][9][10][11] and antioxidant of Eucalyptus Leaves [12][13][14][15][16] . Eucalyptus essential oil is extracted from Eucalyptus globulus of the Myrtaceae family and is also known as Tasmanian blue gum or blue gum.…”

Relation between Chemical Composition or Antioxidant Activity and Antihypertensive Activity for Six Essential Oils

“…The capacity of EOs to give antioxidative effect was studied previously (Ennajar and others 2009; Ben Marzoug and others 2010; Mkaddem and others 2010; Chabir and others 2011). From each studied EO in this article, in both DPPH and ABTS antioxidative potential assays, T. capitatus EO has the best antioxidative activity ( IC 50 = 0.59 ± 0.02 mg/L, DPPH assay and 1.24 ± 0.05 mg/L, ABTS assay) when M. armillaris EO has the weakest ( IC 50 = 2183.6 ± 44.3 mg/L, DPPH assay and 247.3 ± 3.9 mg/L, ABTS assay).…”

“…Chemical composition of J. phoenicea leaves and berries (Ennajar and others 2009), T. capitatus (Mkaddem and others 2010), E. gracilis (Ben Marzoug and others 2010), and M. armillaris (Chabir and others 2011) have been studied and discussed elsewhere (Table 1). Ennajar and others (2009) have explained that hydrocarbons monoterpenes were the main constituents of EOs of J. phoenicea .…”

“…Low content of mono‐ and sesquiterpenes were found in T. capitatus . Ben Marzoug and others (2010) have shown that for the E. gracilis EO, mono‐ and sesquiterpene hydrocarbons represent 3.5% and 2.8%, respectively, in chemical composition, and the oxygenated monoterpenes had the most important proportions (84.6%). 1,8‐Cineole (77.97%), cis‐sabinol (4.20%), p‐cymene (4.55%), and α‐pinene (2.29%) were the main compounds.…”

The interaction between the gall wasp Leptocybe invasa and Eucalyptus camaldulensis leaves: A study of phyto-volatile metabolites

“…All these investigations revealed the major constituents to be qualitatively more or less the same; however, quantitatively they are very different. The minor constituents show qualitative and quantitative variation depending on the soil, climate and degree of maturity (Giamakis et al, 2001;Ben Marzoug et al, 2010). Generally, 1,8-cineole is one of the most abundant and unique volatile constituent in Eucalyptus.…”