Chromogenic Detection –Food Microbiology in Colour

In testing food samples for microbial contamination, mandatory subcultures and confirmatory biochemical tests make the procedure sometimes cumbersome, taking a longer time. However, a RAPID  and ACCURATE means of detection and enumerating microorganisms presents a faster and more reliable method. It uses colour production by the desired isolate, based on the specific enzyme activities

Lab M is a notable manufacturer of these media. Among the tested media are Listeria monocytogenes, coliforms and E coli  0157:H7 and Salmonella species. As a matter of fact, Lab M’ Harlequin Listeria Chromogenic Agar was the first chromogenic dehydrated Listeria medium as specified by ISO 11290. Its reliable in food safety testing. There s also the one for Salmonella that equally proves  effective.  Harlequin Tryptone Bile Glucuronide Agar, TBGA,  was developed specifically  for  simple enumeration of E. coli without the need for membrane or pre-incubation


For more information, please contact LabM website



Manufacturers are encouraged  to send us updated information on their products. Just make sure it has relevance to FOOD SAFETY



Dele Fapohunda PhD

10 January 2023

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