Selenite Cystine Broth

//Selenite Cystine Broth

Selenite Cystine Broth

SKU: KM0158 Category:

Selenite cystine broth is a modification of selenite F broth and is for the selective enrichment of Salmonellae spp. from clinical, food and environmental specimens.
The peptone acts as a nitrogen, carbon and vitamin source. Lactose is a fermentable carbohydrate and sodium phosphate is a buffer. L-cystine is used to enhance the recovery of Salmonellae spp. in low numbers. The medium is made selective by the addition of sodium biselenite (KM8021).
Following overnight incubation subculture(s) are usually made on to one or more of the many selective enteric solid media.


Additional Information

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Storage Temp (°C)

Dehydrated Medium Appearance

Prepared Medium Appearance

Dehydrated Medium Colour

Prepared Medium Colour

Dehydrated PH

Prepared PH

Product Description

Organisms Ref. No Result
Salmonella typhimurium NCTC 12023 Growth
Escherichia coli NCTC 12241 Inhibited



Peptone 5.0
Lactose 4.0
Sodium phosphate 10.0
L-Cystine 0.01
Total 19.0
*Adjusted/supplemented as required to meet performance requirements


Suspend 19 g of the medium in one litre of deionised / purified water. Add 4 g of sodium bi-selenite (KM8021). Allow the medium to soak whilst mixing for 10 minutes. Heat with frequent agitation until boiling. Cool to 45-50°C, mix well and aseptically dispense into appropriate sterile containers.
To minimise any possible risk of teratogenicity to laboratory workers, the sodium biselenite must be added to this medium separately.