Inhibition of Pseudomonas aeruginosa biofilm formation by ۲,۲’-bipyridyl, lipoic, kojic and picolinic acids

Objective(s):The inhibitory effects of iron chelators, and FeCl۳ chelation on biofilm formation and swarming motility were investigated against an opportunistic human pathogen Pseudomonas aeruginosa. Materials and Methods:The inhibitory activity of ۲,۲’-bipyridyl, lipoic acid, kojic acid and picolinic acidonbiofilm formation of P. aeruginosa strain PAO۱ and three clinical isolates (P. aeruginosa  PAK۰۱,P. aeruginosa PAK۰۲ and P. aeruginosa PAK۰۳) were investigated, based on crystal violet assay, and swarming motility test. Results:The kojic, lipoic and picolinic acid inhibited biofilm formation by ۵-۳۳% in all tested P. aeruginosa isolates. When chelated iron was added, biofilm inhibition rates were determined to be ۳۹-۵۷%. Among the tested chelators against P. aeruginosa, lipoic acid (۸۴%) and kojic acid (۶۸%) presented the highest inhibition of swarming motility. This is the first study to report the inhibitory effect of lipoic acid on biofilm formation and swarming motility of P. aeruginosa. Conclusion: It is considered that lipoic and picolinic acids can serve as alternatives for the treatment of the P. aeruginosa infections by inhibiting biofilm formation.

کلیدواژه ها:

Alpha lipoic acid ، Biofilm ، Kojic acid ، Picolinic acid ، Pseudomonas aeruginosa ، Swarming motility