Lysine Agar

Overview

Lysine Agar is a high-performance differential medium designed to quickly distinguish Salmonella and other Enterobacteriaceae based on lysine decarboxylation.

If you’re running food safety or diagnostic testing, speed and clarity matter. This medium delivers sharp, easy-to-read colour changes — allowing you to confidently separate lysine-positive organisms (like Salmonella) from non-decarboxylating bacteria.

Formulated with L-lysine, glucose, and a precise pH indicator system, it provides both strong growth and clear biochemical differentiation in a single step.

Why Labs Choose This

✔ Clear purple vs yellow reaction — no guesswork
✔ Reliable differentiation of Salmonella spp.
✔ Strong growth support for enteric bacteria
✔ Works seamlessly with standard ID workflows
✔ Consistent performance across batches

Where It’s Used

Food & Beverage Testing
• Rapid screening for Salmonella contamination
• Routine QC in dairy, meat, and ready-to-eat products

Clinical & Diagnostic Labs
• Biochemical identification of enteric pathogens
• Integration into multi-test identification systems

Research & QC Labs
• Enzyme activity studies (lysine decarboxylase)
• Microbial characterisation and validation

Why This Medium Matters

In real-world testing, weak colour reactions and inconsistent media slow everything down.

Lysine Agar solves that by delivering:
→ High contrast colour shifts
→ Reliable enzyme detection
→ Faster decision-making in the lab

That means fewer repeats, clearer results, and more confidence in your data.

Composition (per litre)

Peptone / Proteose Peptone – 10.0 g
Yeast Extract – 3.0 g
Glucose – 1.0 g
L-Lysine – 5.0 g
Bromcresol Purple – 0.02 g
Agar – 15.0 g

Final pH: 6.8 ± 0.2 at 25 °C

Preparation

Dissolve 34 g in 1 L purified water
Heat until fully dissolved
Autoclave at 121 °C for 15 minutes
Cool to 45–50 °C before pouring

Incubation & Interpretation

Temperature: 35–37 °C
Time: 18–48 hours

Results:
• Purple → Lysine positive (Salmonella likely)
• Yellow → Lysine negative

Storage

Powder: 15–30 °C, dry
Prepared media: 2–8 °C
Protect from light

Compliance

✔ COA available
✔ SDS available
✔ Suitable for food and microbiology labs

Intended Use

For laboratory use only.
Not for human or animal consumption.

Why Buy from Ausamics

✔ No 4–6 week import delays
✔ Melbourne-based stock
✔ Competitive pricing vs global brands
✔ Built for Australian labs