Post-antibacterial effect of thymol.
The antibacterial activity of thymol has been well established and reported in the scientific literature. Continued suppression of bacterial growth following limited exposure to antimicrobial compounds at different concentrations greater than or equal to the minimum inhibitory concentration level (MIC) and at concentrations less than the MIC can be used as an indicator of biological activity, and are respectively referred to as a post-antibacterial effect (PAE) and a post-antibiotic sub-MIC effect (PA-SME). In this study, the PAE and the PA-SME of thymol against Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa, and Bacillus cereus were investigated. A spectrophotometric method was used to determine the PAE and the PA-SME of thymol against the selected test strains. Thymol exhibited a considerable PAE and PA-SME at MIC and sub-MIC concentrations against test strains. The greatest duration of both the PAE and the PA-SME was observed for thymol against E. coli and P. aeruginosa. The PAE and PA-SME times for E. coli were 12 and 8 h, respectively, and for P. aeruginosa were 11 and 7.5 h, respectively. The duration of the PAE and PA-SME observed for S. aureus and B. cereus was shorter than for Gram-negative strains.
Zarrini
Gholamreza
G
Department of Animal Biology, Faculty of Natural Biology, University of Tabriz, Tabriz, Iran.
Delgosha
Zahra Bahari
ZB
Moghaddam
Kamyar Mollazadeh
KM
Shahverdi
Ahmad Reza
AR
D000900:Anti-Bacterial Agents / Q000008:administration & dosage / Q000494:pharmacology*; D001419:Bacteria / Q000187:drug effects*; D004359:Drug Therapy, Combination; D008826:Microbial Sensitivity Tests; D013053:Spectrophotometry; D013943:Thymol / Q000008:administration & dosage / Q000494:pharmacology*; D013997:Time Factors
D000900:Anti-Bacterial Agents; D013943:Thymol