Description

A selective Hiveg medium recommended for the simultaneous detection of Escherichia coli and total coliforms in water and food samplesThe chromogenic mixture contains two chromogenic substrates. The enzyme ß-D-galactosidase produced by coliforms cleaves one of the chromogen to form salmon to red coloured colonies . The enzyme ß-D-glucuronidase produced by Escherichia coli, cleaves X-glucuronide, the other chromogen . Colonies of Escherichia coli gives dark blue to violet coloured colonies due to cleavage of both the chromogens.