Related Experiment Video

Updated: Aug 7, 2026

A Novel Method to Determine the Longitudinal Antibacterial Activity of Drug-Eluting Materials
06:18

A Novel Method to Determine the Longitudinal Antibacterial Activity of Drug-Eluting Materials

Published on: March 3, 2023

A comparison of the in vitro antimicrobial activity of liposomes containing meropenem and gentamicin

Zuzanna Drulis-Kawa1, Jerzy Gubernator, Agata Dorotkiewicz-Jach

  • 1Institute of Genetics and Microbiology, University of Wrocław, Przybyszewskiego 63/77, Wrocław, Poland. kawa@microb.uni.wroc.pl

Cellular & Molecular Biology Letters
|July 19, 2006
PubMed

Insights

Cationic liposomes loaded with antibiotics like meropenem demonstrated superior antimicrobial activity against Gram-positive and Gram-negative bacteria compared to neutral or anionic liposomes. Specific cationic formulations significantly enhanced drug efficacy, lowering minimum inhibitory concentrations.

Area of Science:

  • Pharmaceutical Sciences
  • Drug Delivery Systems
  • Antimicrobial Research

Background:

  • Liposomes are versatile drug delivery systems with potential for antimicrobial applications.
  • Meropenem and gentamicin are broad-spectrum antibiotics used to combat bacterial infections.
  • Optimizing liposome formulations can enhance antibiotic efficacy and overcome resistance.

Purpose of the Study:

  • To evaluate the in vitro antimicrobial activity of liposome-encapsulated meropenem and gentamicin.
  • To compare the efficacy of cationic, neutral, and anionic liposome formulations.
  • To identify optimal liposome compositions for enhanced antibiotic delivery.

Main Methods:

  • Preparation and characterization of eight cationic, two neutral, and three anionic liposome formulations.
  • Encapsulation of meropenem and gentamicin within liposomes.
  • In vitro antimicrobial activity testing in broth and serum media.
  • Determination of minimum inhibitory concentrations (MICs).

Main Results:

  • Cationic liposome formulations exhibited enhanced antibacterial efficacy against both Gram-positive and Gram-negative bacteria.
  • The type of liposome charge (cationic, neutral, anionic) significantly influenced antimicrobial activity.
  • The most effective formulations were cationic PC/DOPE/DOTAP 3:4:3 and PC/Chol/DOTAP 3:4:3.
  • MICs for meropenem in these cationic formulations were 2 to 4 times lower than for the free drug.

Conclusions:

  • Cationic liposomes represent a promising strategy for improving the delivery and efficacy of antibiotics like meropenem and gentamicin.
  • Liposome charge is a critical factor in determining antimicrobial performance.
  • Specific cationic liposome compositions show potential for developing advanced antibacterial therapies.

Related Concept Videos

Antimicrobial Effectiveness01:28

Antimicrobial Effectiveness

The effectiveness of antimicrobial agents depends on various factors influencing their ability to eliminate microbial populations. Larger microbial populations require more time for complete eradication, emphasizing the importance of population size analysis when evaluating antimicrobial efficacy.Microbial resistance to antimicrobial agents varies significantly. Highly resilient microorganisms include endospores, gram-negative bacteria, and non-enveloped viruses, while prions are exceptionally...
Determination of Multiple Dosing Parameters: Steady-State, Minimum and Maximum Concentrations01:15

Determination of Multiple Dosing Parameters: Steady-State, Minimum and Maximum Concentrations

Gentamicin, an aminoglycoside antibiotic, is commonly administered via intermittent intravenous infusion to treat severe infections. An intermittent one-hour infusion of gentamicin, administered at eight-hour intervals, allows for precise control of plasma drug concentrations, minimizing toxicity while ensuring therapeutic efficacy. Pharmacokinetic principles govern the dynamics of plasma concentrations and can be mathematically described using specific equations.The plasma drug concentration...