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[Bactericidal effect of piperacillin alone and combined]
Abstract:
The bactericidal activity of piperacillin was evaluated by the kill rate kinetics method. Piperacillin compared with amoxicillin, amdinocillin, mezlocillin, cefotaxime, ceftazidime and latamoxef. Against E. coli, piperacillin and antibiotics electively bound to penicillin-binding protein (PBP) 3 had the same, mainly time-dependent, bactericidal activity. Antibiotics bound to PBP 1 and 2 mainly have a dose-dependent activity. The bactericidal activity of piperacillin against E. coli was enhanced when the drug was combined with amoxicillin and amdinocillin; in contrast, the kill rate remained unmodified when piperacillin was combined with latamoxef. When the piperacillin-amikacin combination was tested against Pseudomonas aeruginosa, Enterobacter cloacae, Escherichia coli and Serratia marcescens, early synergism (5th hour), was weak, but after 24 hours piperacillin reduced the regrowth observed with the aminoglycoside, and synergism was much more pronounced irrespective of the species investigated.
Insights
Piperacillin exhibits time-dependent bactericidal activity against E. coli, enhanced by amoxicillin and amdinocillin. Piperacillin-amikacin combinations show delayed synergism against Gram-negative bacteria.
Area of Science:
- Microbiology
- Pharmacology
Context:
- Bacterial infections pose significant challenges, necessitating effective antimicrobial strategies.
- Understanding the kinetics of bactericidal activity is crucial for optimizing antibiotic therapy.
Purpose:
- To evaluate the bactericidal activity of piperacillin using kill rate kinetics.
- To compare piperacillin's activity with other beta-lactam antibiotics and assess combination effects.
Summary:
- Piperacillin demonstrated time-dependent bactericidal activity against E. coli, similar to antibiotics targeting penicillin-binding protein (PBP) 3.
- Combinations of piperacillin with amoxicillin and amdinocillin enhanced bactericidal activity against E. coli.
- Piperacillin-amikacin combinations showed delayed but pronounced synergistic effects against Gram-negative bacteria, reducing aminoglycoside-induced regrowth.
Impact:
- Findings provide insights into piperacillin's mechanism of action and its synergistic potential.
- Optimizing antibiotic combinations can lead to more effective treatments for challenging bacterial infections.
- This research contributes to the development of improved antimicrobial therapies.