SKU: sku-2564
For isolation of S.typhi and other Salmonella species. XLD  AGAR or (XYLOSE  LYSINE  DEOXYCHOLATE  AGAR)was  formulated  by Taylor,  it  is  a differential  media  used  for  isolation  and  differentiation  of  enteric  pathogens  particularly Shigellaand Salmonella. The medium contains Yeast extracts as source of vitamins and minerals. Addition of Sodium desoxycholate  acts  as  a  selective  agent  which  is  inhibitory  to  Gram-positive  bacteria.  It  suppresses  the growth  of  other  enteric  pathogens  and  enhances  the  growth  of  only  few  enteric  bacilli.    The  medium contains Xylose as a fermentable carbohydrate which is utilized by Salmonellaspecies.  The medium pH is changed due to fermentation of Xylose which is detected by indicator Phenol red, thus the colony colour turns red. The medium also contains Lactose and Sucrose as the source of fermentable sugar. L-lysine is an  essential  amino  acid  source.  Lysine  is  added  to  differentiate Salmonella sp.  Sodium  chloride  helps maintaining  the  osmotic  balance  of  the  cells. This medium  also  allows  differentiation  of  bacilli  based  on their  ability  to  produce H2S,  it  contains  Sodium  thiosulphate  and  Ferric  ammonium  citrate  that  helps visualizing  the  black  centered  colonies  on  production  of  hydrogen  sulphide  in  the  medium.  Agar  is added as the solidifying agent.
Product Code: 
TM 1448

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