Essential Oil Applications in Antimicrobial Therapies
Summary
Essential oils, volatile mixtures of terpenes and phenylpropanoids extracted from aromatic plants, have emerged as versatile antimicrobial agents against bacteria, fungi and viruses. Their broad spectrum of activity derives from multiple modes of action, including disruption of cell membranes, interference with energy metabolism and inhibition of quorum sensing. Advances in formulation science have addressed limitations in oil volatility and solubility by employing nanoemulsions, liposomes, hydrogels and biodegradable nanocapsules to enhance stability, control release and improve tissue penetration. Beyond direct antimicrobial effects, essential oils can act synergistically with conventional antibiotics to restore or amplify efficacy against multidrug-resistant pathogens. Applications span food preservation—where oil-based coatings and packaging films reduce spoilage—through topical and inhalation therapies for wound infections, respiratory pathogens and dermatological conditions. Regulatory approval and standardisation of oil chemotypes remain challenges, as does ensuring reproducible bioactivity across batches. Ongoing research focuses on optimising delivery vehicles, elucidating molecular targets in pathogens, and integrating essential oils into combination formulations for clinical and industrial use. The result is a growing portfolio of natural, bio-based antimicrobials with global relevance for public health and sustainable preservation technologies.
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Essential Oil Applications in Antimicrobial Therapies publication trend
The graph below shows the total number of articles in essential oil applications in antimicrobial therapies across all publications each year (not limited to Nature Index journals).
Technical terms
Essential oil: A concentrated, volatile plant extract rich in terpenes and phenylpropanoids with intrinsic antimicrobial properties.
Nanoemulsion: A kinetically stable oil-in-water dispersion with droplet sizes below 200 nm that improves solubility and bioavailability of hydrophobic compounds.
Nanocapsule: A vesicular carrier comprising a core of active oil surrounded by a polymeric or lipid shell, enabling controlled release and protection of volatile components.
Minimum inhibitory concentration (MIC): The lowest concentration of an antimicrobial agent required to prevent visible growth of a microorganism in vitro.
Synergism: A pharmacological interaction in which combined agents produce a greater inhibitory effect than the sum of their individual activities.
References
- Synthesis and characterisation of Mānuka and rosemary oil-based nano-entities and their application in meat. Food Chemistry (2023).
- Mānuka Oil vs. Rosemary Oil: Antimicrobial Efficacies in Wagyu and Commercial Beef against Selected Pathogenic Microbes. Foods (2023).
- Synergistic antimicrobial interaction of plant essential oils and extracts against foodborne pathogens. Food Science & Nutrition (2023).
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