Cystine Tryptic Agar (CTA)
Multipurpose Medium for Fastidious Microorganisms Ausamics

Cystine Tryptic Agar (CTA - AS-1185) | Fermentation Base for Neisseria

$45.00 AUD

AuSaMicS Life Science • Fastidious Diagnostics

Cystine Tryptic Agar (CTA)

Multipurpose Medium for Fastidious Microorganisms

A versatile semi-solid medium designed for carbohydrate fermentation and motility testing of fastidious bacteria, including Neisseria and Corynebacterium species.

AS-1185 🧪 Fermentation Base ✓ Clinical Grade 🦠 Semi-Solid Agar

Indicator: Phenol Red Growth Fact: L-Cystine pH: 7.3 ± 0.2

Diagnostic Results

Acid Production (+)
Medium turns Yellow

Alkaline Result (-)
Medium remains Red/Pink

Motility Check
Growth away from stab line

🔬 Diagnostic Applications

Neisseria Speciation

Standard base for identifying N. gonorrhoeae and N. meningitidis through sugar fermentation panels.

Maintenance Medium

Semi-solid structure allows for the short-term maintenance of fastidious cultures at room temperature.

🧪 Formula Composition (per Liter)

Ingredient	Concentration	Function
Casein Peptone	20.0 g	Primary Protein & Nitrogen Source
L-Cystine	0.5 g	Essential Growth Amino Acid
Phenol Red	0.017 g	Sensitive pH Indicator
Agar	3.5 g	Semi-Solidifying Agent

📋 Technical Specs

Catalog No.	AS-1185
Yield	29.0 g / L
Base Type	Carbohydrate-Free
Storage	2 - 25°C

⚗️ Laboratory Prep

1 Suspend 29.0g in 1L purified water. Mix until dissolved.
2 Heat to boiling to dissolve agar completely.
3 Autoclave at 121°C for 15 min. (Add 1% sugar solutions post-autoclave).
4 Dispense into tubes; allow to cool in an upright position.