Design, synthesis and antimicrobial studies of some polymyxin analogues

To find novel polymycin analogues with high antimicrobial activities and low toxicity, 36 novel polymyxin analogues were synthesized, and in which TZ40-J and TZ40-K were evaluated for their antimicrobial activities using broth microdilution method and for their haemolytic toxicity with sterile sheep blood. Preliminary safety assessments of those two compounds were carried out via the MTT cell viability assay in vitro and acute toxicity assay in vivo. Experimental data demonstrated that TZ40-J and TZ40-K were less toxic and indicate higher activities against Pseudomonas aeruginosa than polymyxin B.