Chromogenic Salmonella Supplement Condalab 6043

Salmonella Chromogenic Supplement is a mixture of antibiotics that inhibit the accompanying flora to avoid false positives. It is a selective chromogenic medium, used for the detection, and presumptive identification of Salmonella species from clinical samples, foods, and waters. The media traditionally used to differentiate species of Salmonella from the rest of the Enterobacteriaceae family. This is based on their capacity to produce hydrogen sulfide and their inability to ferment lactose, this is not really adequate as there are more than 2000 species of Salmonella without these characteristics.

To identify Salmonella species, this medium contains a chromogenic agent based on the combination of two chromogenic substrates that ease quick identification. Magenta colonies are a result of the hydrolysis of one of the chromogenic substrate by the Salmonella species due to the inability to use another chromogenic substrate. Microorganisms producing the enzyme that cleaves the second chromogenic substrate will produce blue-green colonies. Non-Salmonella organisms will appear as a blue-green or are not stained by any of the chromogenes of the medium.

The supplement is added when selectivity is desired, as it inhibits the accompanying flora that could appear the same colour as Salmonella colonies. It can be used as a secondary medium for the detection of Salmonella in food and water according to ISO 6579 and ISO 19250.