09136

Tryptophan Broth

NutriSelect^® Plus, suitable for microbiology

• Synonym(s): Tryptone/Tryptophan Medium
• UNSPSC Code: 41171607
• NACRES: NA.85

Properties

• Agency: according to ISO 10273:2017; according to ISO 16654:2001; according to ISO 6579-1:2017
• Quality Level: 200
• sterility: non-sterile
• form: powder
• shelf life: limited shelf life, expiry date on the label
• composition: casein enzymic hydrolysate, 10.0 g/L ; sodium chloride, 5.0 g/L ; DL-tryptophan, 1.0 g/L
• manufacturer/tradename: NutriSelect^® Plus
• final pH: 7.5±0.2 (25 °C)
• application(s): environmental; food and beverages; water monitoring; microbiology
• suitability: Escherichia coli; coliforms

Description

Application

Medium to perform the indole test to confirm E. coli in water acc. EN IS0 9308-1:2000.

Preparation Note

Dissolve 16g Tryptophan Broth in one liter water by heating. Dispense 3 ml per test tube. Close the tubes with cotton plugs, plastic or metal caps. Autoclave for 15 min at 121 ± 3°C.

Footnote

We offer two media types: the superior granulated GranuCult^® and the cost-efficient powdered NutriSelect^® culture media, depending on your needs.
The designations basic, plus, or prime are added to indicate the quality control level, from basic quality control to standard QC plus to prime for full regulatory compliance.

Legal Information

GRANUCULT is a registered trademark of Merck KGaA, Darmstadt, Germany

NutriSelect is a registered trademark of Merck KGaA, Darmstadt, Germany

Safety Information

• Storage Class Code: 11 - Combustible Solids
• WGK: WGK 1