Colorex™ C3GR

Colorex C3GR is a chromogenic screening medium for the detection of β-Lactamase producing Gram-negative bacteria in clinical specimens. The selectivity of the medium allows for detection of ESBL and/or AmpC producing isolates that exhibit a reduced susceptibility to 3rd generation cephalosporin antibiotics. The chromogenic reactions allow for species differentiation on presumptive positive isolates.


Additional Information


Pack Size

Shelf Life (days)

Storage Conditions

2-8°C – Store in the dark


Firm Gel


Recommended Incubation

Aerobically at 37°C for 18-24 hours


Fill Volume

Product Description

Organisms Ref. No Result
Escherichia coli (ESBL) NCTC 13441 Red colonies
Klebsiella pnuemoniae (ESBL) NCTC 13406 Metallic blue colonies
Escherichia coli NCTC 12241 Inhibited
Klebisella pneumoniae NCTC 9633 Inhibited
Enterococcus faecalis NCTC 12697 Inhibited


  PP3053 – C3GR