Antimicrobial Activity of Salicylanilide Derivatives

Salicylanilide derivatives constitute a versatile class of antimicrobial agents, characterised by a salicylic acid core linked to an aniline moiety. Their lipophilic scaffolds facilitate penetration of microbial membranes, while functional substitutions modulate affinity for intracellular targets such as bacterial enzymes and metabolic pathways. These compounds exhibit broad-spectrum activity against Gram-positive bacteria, including methicillin-resistant Staphylococcus aureus (MRSA), and against mycobacterial species. Structure–activity relationships reveal that electron-withdrawing substituents, particularly halogens and trifluoromethyl groups, often enhance potency by improving membrane interaction or enzyme inhibition. In addition to direct bacteriostatic or bactericidal effects, certain salicylanilide esters demonstrate synergy with established antibiotics and inhibit virulence factors or biofilm formation. Collectively, these features underscore the global significance of salicylanilide derivatives as leads for overcoming drug resistance and for developing next-generation antimicrobials.

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Antimicrobial Activity of Salicylanilide Derivatives publication trend

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

Technical terms

Minimum inhibitory concentration (MIC): The lowest concentration of a compound that prevents visible growth of a microorganism.

Bactericidal concentration: The lowest concentration of a compound required to kill a defined proportion of a microbial population.

Structure–activity relationship: The relationship between the chemical structure of a series of compounds and their observed biological activity.

Salicylanilide: A molecule comprising a salicylic acid moiety linked to an aniline, often modified with various substituents to enhance antimicrobial action.

Methicillin-resistant Staphylococcus aureus (MRSA): A strain of S. aureus that is resistant to beta-lactam antibiotics, representing a significant clinical challenge.

References

1. Investigating the Spectrum of Biological Activity of Ring-Substituted Salicylanilides and Carbamoylphenylcarbamates. Molecules (2010).
2. Antibacterial Activity of Salicylanilide 4-(Trifluoromethyl)-benzoates. Molecules (2013).
3. In Vitro Bactericidal Activity of 4‐ and 5‐Chloro‐2‐hydroxy‐N‐[1‐oxo‐1‐(phenylamino)alkan‐2‐yl]benzamides against MRSA. BioMed Research International (2015).