Xylose Lysine Deoxycholate (XLD) Agar, USP Plates

The specialized XLD formulation provides exceptional differentiation of Salmonella and Shigella species from other Gram-negative enteric organisms through multiple biochemical indicators: xylose fermentation, lysine decarboxylation, and hydrogen sulfide production. Salmonella species typically appear as red colonies with black centers due to H₂S production, Shigella produces red colonies without black centers, while most other Gram-negative organisms produce yellow colonies from xylose fermentation. This multi-indicator system enables rapid presumptive identification of enteric pathogens directly from primary isolation plates, making XLD Agar essential for pharmaceutical microbiology, food safety testing, and clinical diagnostics where accurate detection of Salmonella and Shigella is critical for product safety and regulatory compliance. Manufactured from optically clear polystyrene with heavy-duty construction, raised stacking rings, and breathable sleeve packaging, these plates maintain optimal quality for reliable pathogen detection.

Features:

• USP-compliant selective and differential medium for Gram-negative enteric pathogens
• Specified by USP for Salmonella detection in nonsterile product examination
• Salmonella appear as red colonies with black centers from H_₂S production
• Shigella produce red colonies without black centers
• Other Gram-negatives produce yellow colonies from xylose fermentation
• Optically clear polystyrene with heavy-duty construction and raised stacking rings
• Breathable sleeve packaging prevents condensation and excess moisture
• Essential for pharmaceutical, food safety, and clinical enteric pathogen testing