CCW4721
Coliforms Chromogenic Agar Plates
plate diam. 55 mm, ready-to-use, sterile, box of 30 plates, for Escherichia coli
别名:
CCA
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NACRES:
NA.74
UNSPSC Code:
41171606
Composition:
agar, 13.00 g/L , 5-bromo-4-chloro-3-indoxyl-β-D-glucuronic acid, 0.10 g/L , 6-chloro-3-indoxyl-β-D-galactopyranoside, 0.10 g/L , di-sodium hydrogen phosphate, 2.70 g/L , enzymatic digest of casein, 1.00 g/L , IPTG, 0.10 g/L , sodium chloride, 5.00 g/L , Sodium dihydrogen phosphate dihydrate, 2.20 g/L , sodium pyruvate, 1.00 g/L , sorbitol, 1.00 g/L , Tergitol™ 7, 0.15 g/L , tryptophan, 1.00 g/L , yeast extract, 2.00 g/L
Plate diam.:
55 mm
Feature:
ready-to-use
Sterility:
sterile
agency
ISO 9308-1:2014
Quality Segment
sterility
sterile
form
solid
shelf life
5 mo. (Expiry date on the label)
feature
ready-to-use
composition
agar, 13.00 g/L , 5-bromo-4-chloro-3-indoxyl-β-D-glucuronic acid, 0.10 g/L , 6-chloro-3-indoxyl-β-D-galactopyranoside, 0.10 g/L , di-sodium hydrogen phosphate, 2.70 g/L , enzymatic digest of casein, 1.00 g/L , IPTG, 0.10 g/L , sodium chloride, 5.00 g/L , Sodium dihydrogen phosphate dihydrate, 2.20 g/L , sodium pyruvate, 1.00 g/L , sorbitol, 1.00 g/L , Tergitol™ 7, 0.15 g/L , tryptophan, 1.00 g/L , yeast extract, 2.00 g/L
packaging
box of 30 plates
storage condition
(Store dry and tightly closed)
parameter
9 mL filling volume
plate diam.
55 mm
color
pale yellow
pH
6.8±0.2 (25 °C)
application(s)
food and beverages
microbiology
storage temp.
2-25°C
suitability
Escherichia coli, coliforms
General description
Coliforms Chromogenic Agar Plates are ready-to-use plates to detect and enumerate total coliform and E. coli in water samples. The combined action of peptone, pyruvate, and sorbitol allows rapid colony growth in this phosphate-buffered medium, which also permits simple recovery of sublethal thermally injured coliforms. Sodium chloride provides the correct osmotic environment necessary for growth. The selectivity is attained partially by the Tergitol™ 7, which inhibits the growth of Gram-positive and some Gram-negative bacteria without affecting the coliform bacteria. The culture medium is formulated without antibiotics for water samples with low bacterial background flora. The colonial differentiation is due to the chromogenic mixture, composed of two enzyme substrates: 6-chloro-3-indoxyl-ß-D-galacto-pyranoside (Salmon-GAL) and 5-bromo-4-chloro-3-indoxyl-ß-D-glucuronide (X-Glucuronide). ß-D-galactosidase in coliforms cleaves the first substrate, giving a salmon-red color to the coliform colonies. The ß-D-glucuronidase enzyme, characteristic of E. coli, cleaves the second chromogenic substrate, giving blue color to their colonies.E. coli has two enzymes that cleave both chromogenic substances giving dark blue to violet colonies. Total coliforms are the sum of E. coli colonies and the salmon-red colonies. The IPTG enhances the metabolism of chromogens. Other Gram-negative bacteria produce colorless colonies. However, some Gram-negative bacteria possessing glucuronidase activity (not galactosidase) produce light blue to turquoise colonies.E. coli colonies are confirmed by including a small amount of tryptophane in the medium and coating the blue-violet colonies with a drop of Kovacs Reagent. The color change of the reagent to cherry-red in a few seconds confirms the production of indole and thereby, the presence of E. coli. When the Chromogenic Agar for Coliform is used with the membrane filter method, the color and growth of the colonies can be modified by the characteristics of the membrane filter. It is advisable to perform validation of the membrane filter type used.
Application
Coliforms Chromogenic Agar Plates are suitable for the detection and enumeration of total coliform and E. coli in water samples by the membrane-filtration technique.
Other Notes
1 box containing: 6 plastic bags with 5 plates of 55 mm/bag
If the membrane filtration method is used, it must be considered that the nature and characteristics of the filter membrane used also influences the size and color of the colonies grown on this culture medium.
Legal Information
TERGITOL is a trademark of The Dow Chemical Company ("Dow") or an affiliated company of Dow
存储类别
13 - Non Combustible Solids
wgk
WGK 1
flash_point_f
Not applicable
flash_point_c
Not applicable