Description
3/pack
LISTERIA DEMI FRASER BROTH prepared according to the formulation described by Fraser, is a modification of UVM enrichment broth. Tryptone, peptone and beef and yeast extracts provide nitrogen, carbon, sulphur and vitamins. Lithium chloride and sodium chloride maintain the osmotic balance of the medium. Potassium phosphate monobasic and sodium phosphate bibasic are buffers. High sodium chloride concentration is a selective agent. The presence of Listeria spp. is indicated by hydrolysis of aesculin to produce esculetin which reacts with ferric ions causing the blackening of the broth.
Disclaimer: This product is for laboratory use only.