Essential Oil Composition and Biological Activities of Pelargonium Species
Summary
Pelargonium species, notably P. graveolens and related taxa, synthesise essential oils dominated by monoterpenoids and sesquiterpenoids, including citronellol, geraniol, linalool, menthol and eremophilene. The oil yield and qualitative profile are strongly influenced by genotype, geographical origin, cultivation conditions and phenological stage. Across multiple studies, these essential oils have demonstrated broad-spectrum antioxidant capacity, potent antimicrobial and antibiofilm activity against Gram-positive and Gram-negative pathogens, along with anti-inflammatory, antidiabetic, dermaprotective and insecticidal properties. Mechanistic investigations attribute these effects to radical scavenging, enzyme inhibition (for example α-amylase and lipase), disruption of microbial cell membranes and modulation of inflammatory mediators. The global demand for natural antimicrobial and antioxidant agents has spurred the development of Pelargonium-based formulations in food preservation, dermatology, oral care and pharmaceutical delivery systems.
Research from Nature Portfolio
Studies conducted under mid-hill cultivation conditions have elucidated the essential oil composition and antimicrobial potential of P. graveolens. Under Western Himalayan climatic influence, oil yield (0.15% v/w) was dominated by citronellol (43.35%) and geraniol, reflecting region-specific chemotypes. Antimicrobial evaluation revealed selective inhibition of Gram-positive bacteria, notably Micrococcus luteus and Staphylococcus aureus, at minimum inhibitory concentrations as low as 1% (v/v). These findings underscore the importance of environmental parameters in shaping bioactive profiles suitable for antibacterial applications.
Essential Oil Composition and Biological Activities of Pelargonium Species publication trend
The graph below shows the total number of articles in essential oil composition and biological activities of pelargonium species across all publications each year (not limited to Nature Index journals).
Technical terms
Gas chromatography–mass spectrometry (GC-MS): Analytical technique for separation and identification of volatile compounds.
Minimum inhibitory concentration (MIC): Lowest concentration of an agent that prevents visible microbial growth.
Inhibitory concentration 50 (IC50): Concentration of a substance that reduces a given assay metric by 50%.
Phenological stage: Developmental phase of a plant, such as vegetative, budding or flowering.
Antibiofilm activity: Ability to prevent or disrupt microbial biofilm formation on surfaces.
References
- An In-Depth Study on the Chemical Composition and Biological Effects of Pelargonium graveolens Essential Oil. Foods (2023).
- Protective effects of Pelargonium graveolens (geranium) oil against cefotaxime-induced hepato-renal toxicity in rats. Frontiers in Toxicology (2024).
- Chemical Profiling and Biological Activities of Pelargonium graveolens Essential Oils at Three Different Phenological Stages. Plants (2022).
- Development of phytoactive essential oils-composed organogels against oral pathogens. Journal of Drug Delivery Science and Technology (2024).
- Essential oil composition and antimicrobial potential of aromatic plants grown in the mid-hill conditions of the Western Himalayas. Scientific Reports (2023).
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