Thymol-Based Antibacterial and Anti-Biofilm Strategies Against Wound-Associated Pathogens: A Literature Synthesis

Wound associated infections remain a major clinical challenge because colonization by opportunistic and multidrug resistant pathogens delays tissue repair, prolongs inflammation, and promotes chronic infection through biofilm formation. Among naturally derived antimicrobial compounds, thymol—a monoterpene phenol found in Thymus species and other aromatic plants—has attracted significant interest due to its broad spectrum antibacterial activity, anti biofilm properties, membrane disruptive effects, quorum sensing interference, anti inflammatory activity, and compatibility with modern wound dressing systems. However, current research on thymol is dispersed across microbiology, biomaterials, pharmacology, and clinical wound care, limiting a comprehensive understanding of its translational potential.This review synthesizes available evidence on the antibacterial and anti biofilm performance of thymol against major wound associated pathogens, including Staphylococcus aureus (particularly methicillin resistant S. aureus, MRSA), Pseudomonas aeruginosa, Escherichia coli, Enterococcus faecalis, Acinetobacter baumannii, and Klebsiella pneumoniae. The analysis integrates findings on thymol’s physicochemical properties, antimicrobial mechanisms, minimum inhibitory concentrations, effects on bacterial adhesion and mature biofilms, formulation dependent activity, and synergistic interactions with antibiotics, metals, polymers, and nanocarriers. Evidence indicates that thymol exerts antimicrobial activity through multiple mechanisms, including disruption of bacterial membranes, collapse of proton motive force, leakage of intracellular contents, modulation of oxidative stress, suppression of virulence and quorum sensing, and destabilization of extracellular polymeric matrices in biofilms.Furthermore, incorporating thymol into advanced delivery systems such as hydrogels, nanofibers, nanoemulsions, liposomes, cyclodextrin complexes, and composite wound dressings enhances its solubility, stability, controlled release, and local bioavailability. Despite these advantages, challenges such as concentration dependent cytotoxicity, volatility, limited water solubility, and variability in experimental protocols remain barriers to clinical translation. Overall, thymol represents a promising multifunctional agent for next generation antimicrobial wound care strategies.

کلیدواژه ها:

Phytochemicals ، Terpenoids ، Monoterpenes ، Resistance ، Biofilms