ChroMedium Coliforme (Chromogenic Coliforms Agar) (CCA)

According to ISO 9308-1:2012


Shorthand symbol: CCA
Item number: 40-1064
Format: Petri Dish, 90mm
Colour: Yellowish, transparent
Storage conditions: Dry, in closed bag, at 4 – 10°C.
Shelf-life: 4 Months
pH: 6.8 ± 0.2 at 25°C
Cca
Intented use and fields of application

Chromogenic Coliform Medium (CCA) allows the detection and enumeration of total Coliforms and Escherichia Coli for the microbiological analysis of water and food samples. The nutrient medium promotes the rapid growth of coliforms, even in case of sublethal injury. The addition of Tergitol-7 inhibits the growth of Gram Positive bacteria and in some cases Gram Negative bacteria. The short incubation period of less than 24 hours reduces the analysis time when compared to other existing methods.


Typical composition in g/l

in g per 1 Litre Nutrient medium
Casein peptone1.0
Yeast Extract2.0
Sodium Chloride5.0
Sodium hydrogen phosphate2.2
Disodium hydrogen phosphate2.7
Sodium pyruvate1.0
Sorbitol1.0
Tryptophan1.0
Tergitol-70.15
6-Chloro-3-indoxyl-ß-D-galactopyranoside0.2
5-Bromo-4-chloro-3-indoxyl-ß-D-glucuronic acid0.1
Isopropyl-ß-D-thiogalactopyranoside (IPTG)0.1
Agar12.5


Microbiological quality control

The Microbiological Performance Test is carried out in accordance with the requirements BS EN ISO 11133:2014 .


Productivity
Incubation conditions: 21±3 hours at 36±2°C; Inoculum concentration: 80–120 CFU

OrganismType StrainSpecificationColony morphology
Escherichia coliNCTC 13167/WDCM 0017950–130 %Typical, blueish violet colonies
Enterobacter aerogenesATCC 13048/WDCM 0017550–130 %Typical pink colonies
Citrobacter freundiiATCC 43864/WDCM 0000650–130 %Typical pink colonies


Selectivity
Incubation conditions: 21±3 hours at 36±2°C; Inoculum concentration: 10,000–1,000,000 CFU

OrganismType StrainSpecificationColony morphology
Enterococcus faecalisATCC 19433/WDCM 00009Complete inhibition-


Specificity
Incubation conditions: 21±3 hours at 36±2°C; Inoculum concentration: 1,000–10,000 CFU

OrganismType StrainSpecificationColony morphology
Pseudomonas aeruginosaATCC 27853/WDCM 00025Good growth White, green colonies


Microbial Contamination
Incubation conditions: 5–7 days, 20–25°C and 5–7 days, 30–35 °C

Specification
No microbial contamination


Documents Productinformation Safty information