Chemical Composition and Biological Activities of Eucalyptus Essential Oils
Summary
Eucalyptus essential oils are complex mixtures dominated by oxygenated monoterpenes—most notably 1,8-cineole (eucalyptol)—alongside monoterpene hydrocarbons such as α-pinene and a variety of sesquiterpenes. Composition varies markedly between species, plant parts and extraction methods, giving rise to distinct chemotypes. These oils exhibit a broad spectrum of biological activities: antimicrobial and antifungal effects against bacteria, yeasts and filamentous fungi; potent antioxidant capacity via scavenging of free radicals and modulation of endogenous antioxidant enzymes; anti-inflammatory actions through inhibition of nitric oxide production and down-regulation of pro-inflammatory mediators; and cytotoxic or antiproliferative effects on selected tumour and immune cell lines. Such multifaceted bioactivity underpins diverse practical applications—from respiratory therapeutics, topical antiseptics and agrochemical agents to integrated biorefinery schemes valorising forestry residues. Interdisciplinary research continues to refine correlations between chemical profiles and specific bioactivities, guiding rational selection of species and extraction protocols for both industrial and clinical ends.
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Chemical Composition and Biological Activities of Eucalyptus Essential Oils publication trend
The graph below shows the total number of articles in chemical composition and biological activities of eucalyptus essential oils across all publications each year (not limited to Nature Index journals).
Technical terms
1,8-Cineole (eucalyptol): An oxygenated monoterpene and principal constituent of many Eucalyptus oils, contributing to aroma and diverse bioactivities.
Monoterpene: A volatile organic compound built from two isoprene units, common in essential oils and influential in fragrance and biological effects.
Sesquiterpene: A class of terpenes derived from three isoprene units, often present in essential oils and contributing to their complexity and bioactivity.
Hydrodistillation: An extraction method in which steam or boiling water volatilises essential oil constituents for subsequent condensation and collection.
Reactive oxygen species (ROS): Oxygen-containing molecules that can induce oxidative stress in cells and whose scavenging is a measure of antioxidant activity.
Minimum inhibitory concentration (MIC): The lowest concentration of an antimicrobial agent required to prevent visible growth of a microorganism in vitro.
References
- Essential Oil Composition, Antioxidant Activity and Leaf Micromorphology of Five Tunisian Eucalyptus Species. Antioxidants (2023).
- Exploiting the Integrated Valorization of Eucalyptus globulus Leaves: Chemical Composition and Biological Potential of the Lipophilic Fraction before and after Hydrodistillation. International Journal of Molecular Sciences (2023).
- Chemical Variability and Biological Activities of Eucalyptus spp. Essential Oils. Molecules (2016).
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