HiCrome™ Enterococcus faecium HiVeg™ Agar Base

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SKU:
MV1580
For the chromogenic identification of Enterococcus faecium from faeces, sewage and water supplies.


Intended use

Recommended for chromogenic identification of Enterococcus faecium from faeces, sewage and water supplies.

Composition**

Ingredients g/L
HiVeg™ special peptone 23.000
Corn starch 1.000
Sodium chloride 5.000
Chromogenic substrate 0.100
Arabinose 10.000
Phenol red 0.100
Agar 15.000
Final pH (at 25°C) 7.8±0.2

**Formula adjusted, standardized to suit performance parameters

Directions

Suspend 27.1 grams in 500 ml purified / distilled water. Heat to boiling to dissolve the medium completely. DO NOT AUTOCLAVE. Cool to 45-50°C and aseptically add the rehydrated contents of 1 vial of AC Selective Supplement (FD226). Mix well and pour into sterile Petri plates.

Principle And Interpretation

HiCrome™ Enterococcus faecium HiVeg™ Agar Base is prepared by replacing animal based peptones with vegetable peptones. HiCrome™ Enterococcus faecium HiVeg™ Agar Base is a modification of HiCrome™ Enterococcus faecium Agar, recommended for the chromogenic detection of Enterococcus faecium from urine, faeces, soil, food, water, plants and animals. E.faecium is commonly found in the gastrointestinal tracts of humans (1). The resistance exhibited by Enterococcus species to various antimicrobials has led them to being a major cause of human infections including nosocomial infections (2).

E.faecalis causes 80-90% of infection while E.faecium causes the majority of the remainder (3). The use of selective media for the isolation of Enterococci has been previously reviewed, including those containing chromogenic substrates (4) and media containing cephalexin-aztreonam supplements. Enterococcus species possess the enzyme ß-glucosidase, which specifically cleaves the chromogenic substrate to produce blue coloured colonies. E.faecium ferment arabinose; and cleaves the chromogenic substrate present in the media to produce green coloured colonies along with yellow colouration to the medium. E.faecalis does not ferment arabinose and therefore retains the blue colour.

HiVeg™ special Peptone serves as a source of carbon, nitrogen, long chain amino acids and essential growth nutrients. Corn starch neutralizes the toxic metabolites while sodium chloride maintains the osmotic equilibrium. Phenol red serves as a pH indicator with arabinose being the fermentable carbohydrate.

Type of specimen

Food samples; Water samples.

Specimen Collection and Handling:

For food samples, follow appropriate techniques for sample collection and processing as per guidelines (5).

For water samples, follow appropriate techniques for sample collection, processing as per guidelines and local standards(6).

After use, contaminated materials must be sterilized by autoclaving before discarding.

Warning and Precautions

Read the label before opening the container. Wear protective gloves/protective clothing/eye protection/ face protection. Follow good microbiological lab practices while handling specimens and culture. Standard precautions as per established guidelines should be followed while handling specimens. Safety guidelines may be referred in individual safety data sheets.

Limitations

  1. Some species may show poor growth due to nutritional variations.
  2. Slight colour variations may be observed depending upon the utilization of the substrate by the organism.

Performance and Evaluation

Performance of the medium is expected when used as per the direction on the label within the expiry period when stored at recommended temperature.

Quality Control

Appearance
Light yellow to pinkish beige homogeneous free flowing powder

Gelling
Firm, comparable with 1.5% Agar gel

Colour and Clarity of prepared medium
Red coloured, clear to slightly opalescent gel forms in Petri plates

Reaction
Reaction of 5.42% w/v aqueous solution at 25°C. pH : 7.8±0.2

pH
7.60-8.00

Cultural Response
Cultural characteristics observed with added AC Selective Supplement (FD226) after an incubation at 35-37°C for 18-24 hours.

Organism Inoculum (CFU) Growth Recovery Colour of Colony
Escherichia coli ATCC 25922 (00013*) >=104 inhibited 0%
Enterococcus faecalis ATCC 29212 (00087*) 50-100 luxuriant >=50% blue
Enterococcus faecium ATCC19434 (00010*) 50-100 luxuriant >=50% green
Enterococcus hirae ATCC 10541 50-100 luxuriant >=50% blue
Pseudomonas aeruginosa ATCC 27853 (00025*) >=104 inhibited 0%
Staphylococcus aureus subsp. aureus ATCC 25923 (00034*) >=104 inhibited 0%

Key: (*) Corresponding WDCM numbers.

Storage and Shelf Life

Store between 15-25°C in a tightly closed container and the prepared medium at 2-8°C. Use before expiry date on the label. On opening, product should be properly stored dry, after tightly capping the bottle in order to prevent lump formation due to the hygroscopic nature of the product. Improper storage of the product may lead to lump formation. Store in dry ventilated area protected from extremes of temperature and sources of ignition Seal the container tightly after use. Product performance is best if used within stated expiry period.

Disposal

User must ensure safe disposal by autoclaving and/or incineration of used or unusable preparations of this product. Follow established laboratory procedures in disposing of infectious materials and material that comes into contact with sample must be decontaminated and disposed of in accordance with current laboratory techniques (7,8.

More Information
Product Name HiCrome™ Enterococcus faecium HiVeg™ Agar Base
SKU MV1580
Product Type HiVeg™, HiCrome™
Physical Form Powder
Origin Animal Free (Veg)
Packaging type HDPE
References 1.Skinner F. A. and Quesnel L. B., (Ed.), 1978, Streptococci. Academic Press, Inc. (London) Ltd., London, United Kingdom,p. 245-2612.Chenoweth C., Schaberg D., The Epidemiology of Enterococci, Eur. J.Clin. Micorbiol. Infect. Dis., 9:80-89, 1990.3.Moellering R. C., 1992, Clin. Infect. Dis. 14:1173.4.Willinger B. and Manafi M., 1995, Lett. Appl. Microbiol., 20:300-302.5.Baird R.B., Eaton A.D., and Rice E.W., (Eds.), 2015, Standard Methods for the Examination of Water and Wastewater, 23rd ed., APHA, Washington, D.C. 6.Isenberg, H.D. Clinical Microbiology Procedures Handbook 2nd Edition.7.Jorgensen,J.H., Pfaller, M.A., Carroll, K.C., Funke, G., Landry, M.L., Richter, S.S and Warnock., D.W. (2015) Manual of Clinical Microbiology, 11th Edition. Vol. 1.8.Salfinger Y., and Tortorello M.L., 2015, Compendium of Methods for the Microbiological Examination of Foods,5th Ed., American Public Health Association, Washington, D.C.
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