Antimicrobial Mechanisms of Plant-Derived Compounds

Plant-derived compounds encompass a diverse array of secondary metabolites—phenolics, terpenoids, alkaloids and essential oils—that exert antimicrobial effects through multiple, often complementary, mechanisms. A predominant strategy involves disruption of microbial cell membranes or walls, leading to altered membrane potential, increased permeability and leakage of ions, metabolites and macromolecules. Certain phenolic compounds intercalate into lipid bilayers or bind membrane proteins, causing hyperpolarisation or depolarisation and collapse of electrochemical gradients. Terpenoids and monoterpenoids can partition into hydrophobic regions of membranes, perturbing fluidity and integrity. Other mechanisms include inhibition of key enzymes in energy metabolism (for example those of the tricarboxylic acid cycle or respiratory chain), interference with nucleic acid synthesis, and downregulation of gene expression related to virulence, cell division or biofilm formation. Biofilm disruption and prevention of adhesion to surfaces augment effectiveness against persistent infections. Synergistic interactions with conventional antibiotics have also been documented, offering routes to overcome resistance. These multifaceted actions underpin the global interest in phytochemicals as food preservatives, topical antiseptics and lead structures for drug development.

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Antimicrobial Mechanisms of Plant-Derived Compounds publication trend

The graph below shows the total number of articles in antimicrobial mechanisms of plant-derived compounds across all publications each year (not limited to Nature Index journals).

Technical terms

Minimum inhibitory concentration (MIC): The lowest concentration of an antimicrobial agent required to prevent visible microbial growth in vitro.

Membrane potential: The voltage difference across a cell membrane generated by ion distribution, essential for nutrient uptake, ATP synthesis and cell viability.

Hyperpolarisation: An increase in membrane potential making the inside of the cell more negative, often impairing normal transport and metabolic functions.

Respiratory chain complex: A series of enzyme assemblies in the cell membrane or mitochondria responsible for electron transfer and ATP generation.

References

1. Antimicrobial Properties and Mechanism of Action of Some Plant Extracts Against Food Pathogens and Spoilage Microorganisms. Frontiers in Microbiology (2018).
2. Antibacterial Activity and Mechanism of Ginger Essential Oil against Escherichia coli and Staphylococcus aureus. Molecules (2020).
3. Antimicrobial Susceptibility and Antibacterial Mechanism of Limonene against Listeria monocytogenes. Molecules (2019).
4. Antimicrobial Activity and Proposed Action Mechanism of Linalool Against Pseudomonas fluorescens. Frontiers in Microbiology (2021).