Cetrimide Agar Plate is specifically designed for the selective isolation of Pseudomonas aeruginosa from various samples. This medium contains a quaternary ammonium cationic detergent compound known as Cetrimide, which possesses a unique property. It has the ability to effectively inhibit the growth of all bacteria except Pseudomonas aeruginosa, rendering the medium highly selective for this particular microorganism.
Cetrimide functions by triggering the release of nitrogen and phosphorus from bacterial cells other than P. aeruginosa, thus preventing their growth on the agar plate. The packaging of these media incorporates gamma irradiation as an additional measure to reduce the potential microbial contamination on the dishes and the packaging materials. This step is taken to ensure the purity and integrity of the medium for its intended purpose.