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D3435

Millipore

Dey-Engley neutralizing broth

suitable for microbiology, NutriSelect® Plus

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Synonym(s):
D/E Neutralizing Broth
NACRES:
NA.85

sterility

non-sterile

Quality Level

form

powder

shelf life

limited shelf life, expiry date on the label

manufacturer/tradename

NutriSelect® Plus

final pH

7.6±0.2 (25 °C)

application(s)

environmental
food and beverages
pharmaceutical
sterility testing
surface monitoring

microbiology

storage temp.

2-8°C

suitability

nonselective for Bacillus spp.
nonselective for Escherichia coli
nonselective for Pseudomonas spp.
nonselective for Salmonella spp.
nonselective for Staphylococcus spp.
nonselective for bacteria (General Media)
nonselective for coliforms

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This Item
701497018470122
vibrant-m

D3435

Dey-Engley neutralizing broth

vibrant-m

70149

Nutrient Broth

vibrant-m

70184

Antibiotic Broth

vibrant-m

70122

Nutrient Broth

suitability

nonselective for Bacillus spp., nonselective for Pseudomonas spp., nonselective for Staphylococcus spp., nonselective for coliforms, nonselective for Escherichia coli, nonselective for bacteria (General Media), nonselective for Salmonella spp.

suitability

nonselective for Escherichia coli, nonselective for Pseudomonas spp., nonselective for Staphylococcus spp., nonselective for Streptococcus spp., nonselective for bacteria (General Media), nonselective for coliforms

suitability

bacteria, nonselective for Escherichia coli, nonselective for Klebsiella spp., nonselective for Staphylococcus spp., nonselective for Streptococcus spp., nonselective for coliforms

suitability

Erysipelothrix spp., nonselective for Brucella spp., nonselective for Escherichia coli, nonselective for Listeria spp., nonselective for Staphylococcus spp., nonselective for Streptococcus spp., nonselective for bacteria (General Media), nonselective for coliforms

form

powder

form

powder

form

powder

form

powder

storage temp.

2-8°C

storage temp.

-

storage temp.

-

storage temp.

2-25°C

manufacturer/tradename

NutriSelect® Plus

manufacturer/tradename

NutriSelect® Plus

manufacturer/tradename

NutriSelect® Plus

manufacturer/tradename

NutriSelect® Plus

shelf life

limited shelf life, expiry date on the label

shelf life

limited shelf life, expiry date on the label

shelf life

limited shelf life, expiry date on the label

shelf life

limited shelf life, expiry date on the label

General description

Dey-Engley Neutralizing Broth is used in disinfectant testing where the neutralization of the antiseptics and disinfectants is important for determining its bactericidal activity. The broth consists of tryptone that provides nitrogen and carbon sources, long chain amino acids, vitamins, and other essential nutrients. Dextrose is an energy source. Yeast extract is also a rich source of vitamin B-complex. Sodium bisulfite neutralizes aldehydes; sodium thioglycolate neutralizes mercurial; sodium thiosulfate neutralizes iodine and chlorine; lecithin neutralizes quaternary ammonium compounds; and polysorbate 80, a non-ionic surface-active agent, neutralizes substituted phenolics. Bromocresol purple is an indicator for dextrose utilization. Those organisms that ferment dextrose will turn the medium from purple to yellow. Growth of Pseudomonas sp., which does not ferment dextrose, can be detected by the formation of a pellicle on the surface of the broth.

Application

Dey-Engley neutralizing broth has been used to premoisten the sponge swab samples to neutralise the residual action of the disinfectants on the microbiological growth. Dey-Engley Neutralizing Broth is used in disinfectant testing where neutralization of the antiseptics and disinfectants for determining bactericidal activity. It has also been used to resuspend the Vermamoeba (Hartmannella) vermiformis cysts to neutralize peracetic acid (PAA).
Dey-Engley Neutralizing Broth is used in disinfectant testing where neutralization of the antiseptics and disinfectants is important for determining bactericidal activity.

Biochem/physiol Actions

The Dey-Engley Neutralizing Broth neutralizes a broad spectrum of antiseptics and disinfectants including, quaternary ammonium compounds, phenolics, iodine, chlorine, mercurials, formaldehyde and glutaraldehyde. Sodium thioglycollate, sodium thiosulphate, sodium bisulphite, soya lecithin and polysorbate 80 act as neutralizing components. Growth is indicated by a color change from purple to yellow.

Components

Ingredients(g/L)
Casein enzymatic hydrolysate5.00
Yeast extract2.50
Dextrose10.00
Sodium thiosulfate6.00
Sodium thioglycollate1.00
Sodium bisulfite2.50
Lecithin7.00
Polysorbate 805.00
Bromocresol purple0.02

Preparation Note

Suspend 39 g of Dey-Engley Neutralizing Broth in 1000 ml of distilled water. Boil to dissolve the medium completely. Sterilize by autoclaving 15 lbs. pressure (121°C) for 15 minutes.

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

pictograms

Exclamation mark

signalword

Warning

hcodes

Hazard Classifications

Skin Sens. 1

Storage Class

11 - Combustible Solids

wgk_germany

WGK 3

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

Eyeshields, Faceshields, Gloves


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