Chromogenic culture media provide a rapid and accurate method of isolating and enumerating target micro-organisms based on the detection of specific enzyme activities.
Not only do chromogenic media enable faster detection of specific micro-organisms compared with classical culture media, they also improve sensitivity and can reduce the need for subculture or confirmatory tests.
Lab M®'s Harlequin® range of chromogenic media includes products for the isolation of Listeria species, Salmonella, Escherichia coli and Enterobacter (formerly Cronobacter) sakazakii.
Harlequin® Cronobacter sakazakii Isolation Medium is used for the isolation of Enterobacter sakazakii from milk and milk product as recommended under ISO/TS 22964:2006(E).
Harlequin® E.coli / Coliform Medium is used for the enumeration of Escherichia coli and coliforms in food and environmental samples.
Listeria Chromogenic Agar (according to the formulation of Ottaviani and Agosti) is a selective medium for the isolation and presumptive identification of Listeria monocytogenes from foodstuffs and related materials as described in ISO 11290-1:2014.
Harlequin® membrane Lactose Glucuronide Agar (mLGA) is a medium for the detection and identification of E. coli and coliforms from water samples.
Harlequin® Salmonella ABC Medium was developed for the isolation of Salmonella spp. from food and clinical samples.
Harlequin® SMAC-BCIG is a specific substrate medium for the isolation of Escherichia coli O157:H7, the primary serovar associated with haemorrhagic colitis (HC) and haemolytic uraemic syndrome (HUS).
Tryptone Bile Glucuronide Agar is recommended by ISO 16649 for enumeration of β-glucuronidase-positive Escherichia coli in products intended for human consumption or for the feeding of animals.