Oxoid™ Palcam Listeria Selective Medium PP Plates Pk 10

Rapidly detect, isolate, and differentiate Listeria monocytogenes from food samples with the convenience of ready-to-use Thermo Scientific™ Oxoid™ PALCAM Medium.

PALCAM Medium is a powerful differential and selective diagnostic medium designed for the presumptive identification of L. monocytogenes. Its highly selective nature, combined with a double indicator system, allows for easy differentiation based on:

• Aesculin fermentation: Producing a characteristic black reaction.
• Lack of mannitol fermentation: Maintaining the medium's original pH.

The inclusion of egg yolk in the base also aids the recovery of any damaged Listeria cells.

Key Features & Differentiation:

• Highly Selective: Achieved through the incorporation of lithium chloride, ceftazidime, polymyxin B, and acriflavine hydrochloride, which effectively inhibit most competing microflora.

Easy to Read Differentiation:

• L. monocytogenes: Forms brown/black colonies with a black halo (due to aesculin hydrolysis).
• Contaminants (e.g., staphylococci, enterococci): Grow as yellow colonies (due to mannitol fermentation, changing the phenol red indicator from red to yellow).

• Double Indicator System: Utilizes Aesculin and Ferrous Iron (for black halo formation) and Mannitol and Phenol Red (for pH change).
• Convenience: Supplied as a ready-to-use prepared medium.

Specifications