Merck

Merck RTU Media Plate XLD (Xylose-lysine-deoxycholate) Agar - LI EP+USP, 0152E-120P, 90 mm ICR-Settle Plate filled with 30 ml, 120 pc/PAK

Name: Merck RTU Media Plate XLD (Xylose-lysine-deoxycholate) Agar - LI EP+USP, 0152E-120P, 90 mm ICR-Settle Plate filled with 30 ml, 120 pc/PAK
Brand: Merck

Application: Isolation of Salmonella and Shigella Packaging: 90 mm settle plates with 30 ml filling volume (20 or 120 plates per box)for long incubation (LI) Synonym: Xylose Lysine Deoxycholate Agar Xylose-lysine deoxycholate (XLD) agar is a selective growth medium for the isolation of Salmonella and Shigella species (Taylor and Schelbert, 1971), introduced by Taylor (1965). It is based on the use of the selectively inhibitory component sodium deoxycholate and three indicator systems, i.e., xylose, lactose, and sucrose, in combination with phenol red. The degradation of xylose, lactose, and sucrose to acid causes phenol red to change to yellow. Sodium thiosulfate and ferric salt react to form a precipitate of black iron sulfide in the colonies, indicating the production of hydrogen sulfide. Bacteria that decarboxylate lysine to cadaverine can be identified by the purple coloration around the colonies due to an increase in pH. These reactions can occur simultaneously or sShow more

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