Fraser Broth
SKU No.  700003097  | Catalog No.  NCM0050A
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Fraser Broth

SKU No.  700003097  |  Catalog No.  NCM0050A

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Minimum quantity required: 1
This item must be ordered in multiples of one case. Quantity per case: 1
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Fraser Broth is a selective medium used for the secondary enrichment of Listeria monocytogenes and Listeria spp., as described in ISO 11290-1:2017. Fraser Broth is not intended for use in the diagnosis of disease or other conditions in humans.

Fraser Broth was developed as a modification of UVM medium (NCM0012) and is based on the formula as described by Fraser and Sperber. Listeria spp. hydrolyze the esculin to esculetin which reacts with the ferric ammonium citrate (X211 or 7984) resulting in a black precipitate and a visible positive reaction.

Specifications
BrandNeogen® Culture Media
AnalyteListeria spp.
PlatformDehydrated Culture Media
Mass500 g
Formula
FormulaLiter
Enzymatic Digest of Animal Tissues5.0 g/L
Enzymatic Digest of Casein5.0 g/L
Meat Extract5.0 g/L
Yeast Extract5.0 g/L
Esculin1.0 g/L
Disodium Hydrogen Phosphate9.6 g/L*
Potassium Dihydrogen Phosphate1.35 g/L
Sodium Chloride20.0 g/L
Lithium Chloride3.0 g/L
Acriflavine0.025 g/L
Nalidixic Acide0.02 g/L
*Equivalent to Disodium Hydrogen Phosphate Dihydrate 12.0 g/L
Grams per Liter55.00
Liters per 500 g9.00
Preparation
  1. Dissolve 55 grams of the medium in 1 liter of purified water.
  2. Mix thoroughly.
  3. Autoclave at 121°C for 15 minutes.
  4. Cool to 45-50°C.
  5. Aseptically add 2 vials of NCM4009-0.5* Ferric Ammonium Citrate Supplement and mix thoroughly before dispensing.

*Larger vials may be available. Please see appropriate supplement data sheet for availability and preparation instructions.

Previous Item NumberProduct was previously known as Acumedia Product: 7502 Fraser Broth Base; and LabM Product: LAB212 Fraser Broth PLUS
Package Dimensions4.60 in x 2.90 in x 8.60 in
Package Weight1.35 lb

Additional Information

Ferric Ammonium Citrate Supplement (X211) or Fraser broth base supplement (7984) may be used

Technology

Lithium chloride suppresses the growth of Enterococci in the medium, as Enterococci can also hydrolyze esculin also. Enzymatic digest of animal tissues, casein, meat extract and yeast extract provide the essential vitamins, minerals, amino acids, nitrogen and carbon, while sodium chloride maintains the osmotic balance. The selective components acriflavine and nalidixic acid are blended into the base powder and inhibit the growth of Escherichia coli. Ferric ammonium citrate is added to the tempered broth after sterilization. According to ISO 11290-1:2017, the test portion is inoculated into the primary enrichment medium Half Fraser (Demi-Fraser) Broth (ISO), followed by secondary enrichment in Fraser Broth (ISO) and then sub-cultured onto Harlequin Listeria Chromogenic Agar according to Ottaviani & Agosti (NCM1004). The medium conforms to the performance and formulation requirements of ISO 11290-1:2017.