Factors affecting the assay of gentamicin by the plate diffusion method

Area of Science:

• Microbiology
• Analytical Chemistry

Background:

• The accurate quantification of antibiotics like gentamicin is crucial for therapeutic drug monitoring and quality control.
• Conventional plate diffusion methods are widely used but can be limited by assay sensitivity and accuracy.

Purpose of the Study:

• To optimize the conditions for the gentamicin plate diffusion assay to improve its accuracy.
• To investigate the effects of sodium chloride concentration and pH on gentamicin quantification.

Main Methods:

• Preparation of standard curves by plotting log gentamicin concentration against zone diameter.
• Utilizing a conventional plate diffusion method.
• Testing varying concentrations of sodium chloride and different pH levels.

Main Results:

• The range of zone diameters was markedly increased under optimized conditions.
• Adjusting sodium chloride concentration and pH led to improved assay performance.
• The optimized plate assay method demonstrated considerably improved potential accuracy.

Conclusions:

• Optimized sodium chloride concentrations and pH levels significantly enhance the accuracy of the gentamicin plate diffusion assay.
• The findings suggest a more reliable method for quantifying gentamicin, beneficial for clinical and research settings.