Biological Activity of Monoterpenes and Derivatives

Monoterpenes are a class of plant-derived secondary metabolites composed of two isoprene units. They and their structurally modified derivatives encompass acyclic, monocyclic and bicyclic frameworks bearing hydroxyl, carbonyl or ester functionalities. These compounds exhibit a broad spectrum of biological activities, including antimicrobial, anti-inflammatory, antioxidant, anticancer and neuroprotective effects. Structure–activity relationships reveal that subtle modifications—such as hydroxylation, glycosylation or esterification—can dramatically alter potency, selectivity and pharmacokinetic profiles. Recent advances in formulation science have further enhanced bioavailability and targeted delivery through micellar systems, polymer conjugates and nanoscale carriers. Globally, these natural scaffolds are being pursued both as templates for new pharmaceuticals to address antimicrobial resistance and chronic inflammatory diseases, and as eco-friendly agrochemicals. The interplay between chemical structure, molecular targets (for example membrane lipids, enzymes or transcription factors) and delivery vehicle determines efficacy, safety and practical application in medical, veterinary and agricultural settings.

Research from Nature Portfolio

Foundational work on solubilising a monoterpenoid phenol within surfactant micelles demonstrated that incorporation into non-ionic micellar aggregates preserves antioxidant capacity while markedly enhancing radical-scavenging efficacy. Physicochemical characterisation revealed that specific interactions between the aromatic ring protons and the surfactant ester linkages underpin efficient loading. Subsequent assays confirmed that the micellar formulation outperforms the free compound in neutralising both hydroxyl and DPPH radicals, suggesting a promising route to integrate monoterpenes into aqueous systems for food, cosmetic and pharmaceutical use.

Biological Activity of Monoterpenes and Derivatives publication trend

The graph below shows the total number of articles in biological activity of monoterpenes and derivatives across all publications each year (not limited to Nature Index journals).

Technical terms

Monoterpene: A terpenoid comprising two isoprene units, often found in plant essential oils and responsible for diverse biological activities.

Micelle: A colloidal aggregate of surfactant molecules in an aqueous medium, used to encapsulate hydrophobic compounds and improve solubility.

Biofilm: A complex, surface-attached community of microorganisms embedded within a self-produced polymer matrix, often resistant to conventional antimicrobials.

Nanoparticle: A discrete particle with at least one dimension below 100 nanometres, employed to enhance delivery, stability and targeted action of bioactive agents.

Conjugate: A compound formed by covalently linking two distinct molecular entities—such as a polymer and an active monoterpenoid—to modulate solubility and biological profile.

References

1. Monoterpenes and Their Derivatives—Recent Development in Biological and Medical Applications. International Journal of Molecular Sciences (2020).
2. Physical characterization and antioxidant activity of thymol solubilized Tween 80 micelles. Scientific Reports (2016).
3. Thymol-Functionalized Hyaluronic Acid as Promising Preservative Biomaterial for the Inhibition of Candida albicans Biofilm Formation. ACS Macro Letters (2023).
4. Synergistic Activity of Thymol with Commercial Antibiotics against Critical and High WHO Priority Pathogenic Bacteria. Plants (2023).
5. Thymol-Nanoparticles as Effective Biocides against the Quarantine Pathogen Xylella fastidiosa. Nanomaterials (2023).