Home > Catalogo generale > Culture media and ISO confirmation tests > XLT4 – medium for Salmonella isolation in foodstuff acc. to ISO6579 norm

XLT4 – medium for Salmonella isolation in foodstuff acc. to ISO6579 norm

  • Brand: Bio-Rad
  • Format: 20 x 90 mm Petri
  • Code: BR3563654
  • Technology: Culture media and ISO confirmation tests
  • Application: Food/Water microbiology
  • Tag/Filter: Salmonella

Xylose Lysine Tergitol 4 (XLT4) is a medium used for the isolation of H2S-positive Salmonella in food products. It can be used as the second isolation medium (in parallel to XLD) according to ISO6579 norm. The differentiation of Salmonella is based on the fermentation of xylose, lactose and saccharose, the decarboxylation of lysine and the formation of iron sulfide after reduction of thiosulfate. Phenol red is a colored indicator revealing the reaction of fermentation and of decarboxylation. The production of iron sulfide is demonstrated by the presence of ferric ions. Due to the addition of Tergitol 4, XLT4 inhibits non-Salmonella flora, making this medium both extremely selective and sensitive. Typical Salmonella (H2S-positive) colonies are black or have a black center with a yellow halo after 18-24 hours incubation. If incubation is prolonged, the colonies become either completely black or pink to red with a black center Other bacteria not inhibited by this medium appear yellow or pink without a black center.


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XLT4 – medium for Salmonella isolation in foodstuff acc. to ISO6579 norm
  • Brand: Bio-Rad
  • Format: 20 x 90 mm Petri
  • Code: BR3563654
  • Technology: Culture media and ISO confirmation tests
  • Application: Food/Water microbiology
  • Tag/Filter: Salmonella


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