70194 Millipore

Tryptone Water

suitable for microbiology, NutriSelect® Plus

  •  NACRES NA.74



Related Categories All Food Control Media (alphabetical), All Liquid Media/Broths, Bacteria (General Media), Biochemical Identification Media by Test, Biochemical Identification Media, A to Z,
Quality Level   100
form   powder
shelf life   limited shelf life, expiry date on the label
composition   sodium chloride, 5.0 g/L
  tryptone (tryptic hydrolysate of casein), 10.0 g/L
mfr. no.   NutriSelect® Plus
application(s)   microbiological culture: suitable
  microbiology: suitable
  sample preparation: suitable
final pH   7.5±0.2 (25 °C)
Featured Industry   Environmental
Food and Beverages
suitability   nonselective for Enterobacter spp.
  nonselective for Escherichia coli
  nonselective for Proteus spp.
  nonselective for Salmonella spp.
  nonselective for Staphylococcus spp.
  nonselective for bacteria (General Media)
  nonselective for coliforms
  nonselective for enterobacteriaceae



A liquid medium for the detection of indole-forming microorganisms due to its high content of tryptophan, it is more reliable than peptone water for this purpose.

Tryptone water is primarily used for the cultivation and maintenance of fastidious aerobic and facultative microorganisms such as Escherichia coli and Pseudomonas species.

Preparation Note

Add 15 g to 1 litre of distilled water. Mix well, distribute into final containers and sterilize by autoclaving at 121°C for 15 minutes.

Other Notes

Direct plating method for enumeration of E. coli in water

Legal Information

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

Safety & Documentation

Safety Information

Personal Protective Equipment 
NONH for all modes of transport
WGK Germany 
Flash Point(F) 
Not applicable
Flash Point(C) 
Not applicable


Certificate of Analysis (COA)

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