CRITERION™ XLD Agar | 500g Selective & Differential Media for Salmonella & Shigella | Hardy Diagnostics

CRITERION™ XLD Agar, Dehydrated Culture Media, 500gm Wide-Mouth Bottle

SKU: C7321
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For laboratory, institutional, and professional use only. Not available for residential or personal purchase. Orders are subject to verification.

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Hardy Diagnostics CRITERION™ XLD Agar is recommended for use as a selective and differential medium for the isolation of Gram-negative enteric pathogens such as Salmonella and Shigella from fecal and other specimens.

CRITERION™ Dehydrated Culture Media by Hardy Diagnostics is formulated to meet or exceed the highest standards. Compare these features:

Wide mouth opening - reduces dust formation by allowing the easy entry of a scoop
Convenient handgrip - 'no slip' finger holds
Stackable containers - for efficient storage
Increased solubility - dissolves quickly
Custom and bulk products available - to your specifications
Competitive pricing - call for a price quote for large volume purchases!
Complete technical/instruction sheets
Unparalleled performance - tested for optimal growth

CRITERION™ XLD Agar (Xylose Lysine Deoxycholate Agar) by Hardy Diagnostics is a selective and differential medium designed for the isolation of Gram-negative enteric pathogens, particularly Salmonella and Shigella, from fecal specimens and environmental or food-related samples.

This medium uses a combination of:

Xylose, lactose, and sucrose for carbohydrate fermentation

Lysine for decarboxylation reactions

Sodium deoxycholate as a selective agent against Gram-positive organisms

Ferric ammonium citrate and thiosulfate for hydrogen sulfide (H₂S) detection

These components create distinct, interpretable colony morphologies:

Salmonella: red colonies with black centers (H₂S production)

Shigella: red colonies, non-fermentative

Coliforms: yellow colonies (carbohydrate fermentation)

XLD Agar is a standard medium referenced in clinical microbiology, public health testing, food safety protocols, and environmental monitoring programs.

Key Features:

Highly selective for Salmonella and Shigella

Differential reactions support clear pathogen identification

Suppresses Gram-positive flora via deoxycholate

H₂S indicator system identifies black-centered colonies

500g wide-mouth bottle for efficient media preparation

Reliable performance in regulated diagnostic and food safety workflows

Manufactured to rigorous quality standards ensuring reproducible results

Specifications
Manufacturer: Hardy Diagnostics
Brand: CRITERION™
Product Type: Dehydrated Culture Media
Medium Name: XLD Agar (Xylose Lysine Deoxycholate Agar)
Application: Isolation and differentiation of Salmonella and Shigella from fecal, food, and environmental samples
Format: Dehydrated powder
Fill Volume: 500gm
Pack Size: Each
Industry Use: Food Safety; Clinical; Environmental; Cosmetics; Cannabis QA Testing; Pharmaceutical Manufacturing
Selective Components: Sodium deoxycholate to inhibit Gram-positives
Differential Components: Xylose, lactose, sucrose, lysine, thiosulfate, ferric ammonium citrate
Key Colony Morphology:
- Salmonella: red colonies with black centers (H₂S positive)
- Shigella: red colonies (non-fermenters)
- Coliforms: yellow colonies (fermenters)
Container Type: 500gm wide-mouth bottle
Solubility: High solubility for easy media preparation
Quality: Tested for selective and differential performance; technical sheets available

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