E. Coli. Broth Granule-Product Details-qingdao hopebio

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E. Coli. Broth Granule

microbial medium
Chinese Name:EC肉汤颗粒
Product No.:HBKD0105
Specification:300mL/pack*10packs
Product Price:
Product Use:For the determination and enumeration of coliforms, especially E. coli, in water and other materials.
Remarks:

Technical Data:

Approximate Formula:

Ingredients

gm/liter

Pancreatic digest of casein

20.0

Sodium chloride

5.0

Lactose

5.0

Dipotassium hydrogen phosphate

4.0

Potassium dihydrogen phosphate

1.5

Bile salt No.3

1.5

Final pH 6.9±0.2 at25

*Adjusted and/or supplemented as required to meet performance criteria.

Directions:

Suspend37gof the medium in one liter of deionized or distilled water. Mix well. Heat until the medium is completely dissolved. Dispense in test tubes containing gas collecting tubes (Durham) and sterilize at121℃(15 lbs.) for 15 minutes.

Principle and Interpretation:

E.Coli Broth is a kind of cultivation medium, used for detection of fecal coliforms and E.Coli. The procedure employing EC Broth provides information regarding the source of the coliform group (fecal or non-fecal) when used as a confirmatory test.

Pancreatic digest of casein provides essential growth nutrients. Lactose is the fermentable sugar. Bile salts mixture inhibit gram-positive bacteria especially bacilli and faecal Streptococci. Phosphates control the pH during fermentation of lactose.Gas production in a fermentation tube within 24 hour or less is a presumptive evidence of the presence of coliform bacteria.This medium can be used at37°Cfor the detection of coliform organisms or at44.5°Cfor the isolation of Escherichia coli from water and shellfish) or45.5°Cfor foods.

Appearance:

Dehydrated medium is a free-flowing yellowish granule. The prepared medium is a kind of yellowish transparent liquid.

Precautions:

This medium is for laboratory use only. Dried medium which is past shelf life, caking or color variation cannot be used.

Storage conditions and Shelf life:

E.Coli Broth must be stored tightly capped in the original container at 5-30°C. The dehydrated medium has a shelf life of 3 years from date of manufacturing. Prepared medium may be stored, out of direct light at 2-8°C.

Quality control:

Inoculate and incubate at 44.5±0.2℃for 24-48 hours.

Microorganism

Strains Number

Inoculum (CFU

Growth

Remarks

Escherichia coli

ATCC 25922

10-100

luxuriant

Turbidity 2; and gas is full with 1/3 of tube

Salmonella typhimurium

ATCC 14028

10-100

luxuriant

Turbidity 2; non-aerosis

Enterococcus faecalis

ATCC 29212

1000-5000

inhibited

Turbidity 0(no growth) or Turbidity 1(Faint growth); non-aerosis

Citrobacter freundii

ATCC 43864

10-100

luxuriant

Turbidity 2; non-aerosis

Staphylococcus Aureus

ATCC 25923

1000-5000

inhibited

Turbidity 0(no growth)

Enterobacter cloacae

ATCC 23355

10-100

luxuriant

Turbidity 2; non-aerosis

Reference:

1. Hajna A. A. and Perry C. A., 1943, Am. J. Public Health, 33:550.

2. Fishbein M. and Surkiewicz B. F., 1964, Appl. Microbiol., 12:127.

3.GB4789.28-2013 People's Republic of China food safety national standard food microbiology test medium and reagent quality requirements.


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