Essential Oils and Their Biological Activities
Summary
Essential oils are complex mixtures of volatile secondary metabolites, predominantly terpenoids and phenolic compounds, extracted from aromatic plants. Their lipophilic nature facilitates interaction with biological membranes, enabling a spectrum of bioactivities including antioxidant, antimicrobial, antifungal, anti-inflammatory and insecticidal effects. These oils exert antioxidant activity by scavenging reactive oxygen species and enhancing cellular redox balance. Antimicrobial efficacy arises from disruption of microbial cell walls and membranes, alteration of enzyme function and interference with quorum sensing. In antifungal applications, essential oils perturb fungal cell walls and inhibit spore germination. Delivery strategies—ranging from nanoencapsulation to vapour-phase administration—optimise stability, controlled release and bioavailability. Such formulations have been explored for wood preservation, food safety and medical devices. Beyond direct biocidal actions, essential oils modulate host immune responses and exhibit synergistic potential with conventional drugs, reducing resistance development. Their global significance spans agriculture, pharmaceuticals, cosmetics and cultural heritage conservation. Ongoing research seeks to standardise compositions, elucidate molecular mechanisms and ensure sustainable sourcing, thus translating botanical diversity into practical and safe health-promoting solutions.
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Essential Oils and Their Biological Activities publication trend
The graph below shows the total number of articles in essential oils and their biological activities across all publications each year (not limited to Nature Index journals).
Technical terms
Terpenoid: A class of naturally occurring organic compounds constructed from isoprene units, major constituents of essential oils.
Free radical-scavenging: The neutralisation of reactive oxygen or nitrogen species by antioxidants, preventing cellular oxidative damage.
Minimum inhibitory concentration (MIC): The lowest concentration of an antimicrobial agent that prevents visible growth of a microorganism in vitro.
Nanoparticle: A particle with dimensions between 1 and 100 nm, employed to encapsulate or deliver bioactive compounds with controlled release.
Vapour phase: The gaseous form of a volatile substance used to achieve antimicrobial effects through exposure to its vapours.
References
- Solvent effects on terpenoid compositions and antioxidant activities of Cinnamomum camphora (L.) J. Presl extracts and the main antioxidant agent evaluation through in vitro and in vivo assay. Chemical and Biological Technologies in Agriculture (2024).
- Lignin Nanoparticles with Entrapped Thymus spp. Essential Oils for the Control of Wood-Rot Fungi. Polymers (2023).
- Mechanisms of vapor‐phase antibacterial action of essential oil from Cinnamomum camphora var. linaloofera Fujita against Escherichia coli. Food Science & Nutrition (2019).
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