Antimicrobial Properties of Allium-Derived Compounds
Summary
The genus Allium encompasses garlic, onion, shallot and related species, all distinguished by a rich repertoire of sulphur-containing phytochemicals. Upon tissue disruption, the enzyme alliinase converts precursors such as alliin into bioactive compounds including allicin, diallyl disulfide and diallyl trisulfide. These organosulfur metabolites exhibit broad-spectrum antimicrobial effects by reacting with thiol groups of key microbial enzymes, compromising membrane integrity and interfering with quorum sensing and biofilm formation. In addition to direct bactericidal and fungicidal activity, Allium extracts can inhibit toxin production and attenuate virulence traits in multi-drug-resistant strains. The growing body of research highlights their potential as complementary alternatives to conventional antibiotics, with applications spanning food preservation, agricultural biocontrol and novel therapeutics. Their relative safety, natural origin and diverse mechanisms of action address urgent global challenges posed by antimicrobial resistance and demand for sustainable antimicrobial agents.
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Antimicrobial Properties of Allium-Derived Compounds publication trend
The graph below shows the total number of articles in antimicrobial properties of allium-derived compounds across all publications each year (not limited to Nature Index journals).
Technical terms
Allicin: A highly reactive thiosulfinate produced from alliin that targets microbial thiol-containing enzymes and disrupts cell membranes.
Organosulfur compounds: Sulphur-based molecules, including diallyl disulfide and trisulfide, responsible for the antimicrobial efficacy of Allium species.
Biofilm: A structured community of microorganisms encased in a self-produced extracellular polymeric matrix, exhibiting enhanced resistance to antimicrobials.
Minimum inhibitory concentration (MIC): The lowest concentration of an antimicrobial agent that prevents visible microbial growth under defined laboratory conditions.
References
- Antibacterial Properties of Organosulfur Compounds of Garlic (Allium sativum). Frontiers in Microbiology (2021).
- Chemical Composition of Essential Oils of Bulbs and Aerial Parts of Two Cultivars of Allium sativum and Their Antibiofilm Activity against Food and Nosocomial Pathogens. Antibiotics (2022).
- Antimicrobial Effect and the Mechanism of Diallyl Trisulfide against Campylobacter jejuni. Antibiotics (2021).
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