Agar Medium C (Sabouraud-Glucose Agar with Antibiotics)

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SKU:
ME1472
For selective cultivation of yeasts and moulds in accordance with European Pharmacopoeia.


Composition

Ingredients Gms / Litre
Peptone (meat and casein) 10.000
Glucose monohydrate 40.000
Agar 15.000
pH after sterilization 5.6±0.2

**Formula adjusted, standardized to suit performance parameters

Directions

Suspend 61.36 grams of dehydrated medium in 995 ml purified/distilled water. Heat to boiling to dissolve the medium completely. Sterilize by autoclaving at 15 lbs pressure (121°C) for 15 minutes. Add aseptically rehydrated contents of one vial of Tetracycline Selective Supplement (FD196). Mix well before pouring into sterile Petri plates.

Principle And Interpretation

Sabouraud Glucose agar w/ antibiotics is cited as Medium C and recommended for cultivation of yeasts and moulds by European Pharmacopoeia (1). This medium was described originally by Sabouraud (2) for the cultivation of fungi, particularly useful for the fungi associated with skin infections. The medium is used with antibiotics such as tetracycline and benzylpenicillin (3) for the isolation of pathogenic fungi from materials containing large numbers of fungi or bacteria.

Peptone (from meat and casein) provides nitrogenous compounds. Glucose monohydrate provides an energy source. Tetracycline and benzyl penicillin inhibits a wide range of Gram-positive and Gram-negative bacteria which makes the medium selective for fungi (4). The low pH favours fungal growth and inhibits contaminating bacteria from clinical specimens (5).

Some pathogenic fungi may produce infective spores which are easily dispersed in air, so examination should be carried out in safety cabinet.

Quality Control

Appearance

Cream to yellow homogeneous free flowing powder

Gelling

Firm, comparable with 1.5% Agar gel

Colour and Clarity of prepared medium

Light amber coloured clear to slightly opalescent gel forms in Petri plates

pH of 6.14% w/v aqueous solution at 25°C (after sterilization).

pH

5.40-5.80

Growth Promotion Test

Growth Promotion was carried out in accordance with the harmonized method of EP, after an incubation at 20-25°C with added Tetracycline Selective Supplement (FD196) for <=5 days.Recovery rate is considered as 100% for bacteria growth on Soybean Casein Digest Agar and fungus growth on Sabouraud Dextrose Agar

Cultural Response

Organism Inoculum (CFU) Growth Observed Lot value (CFU) Recovery Incubation temperature Incubation period
Candida albicans ATCC 10231 50-100 Luxuriant (white colonies) 25-100 >=50% 20-25 °C <=5 d
*Aspergillus brasiliensis ATCC 16404 50-100 luxuriant 25-100 >=50% 20-25 °C <=5 d
Candida albicans ATCC 2091 50-100 luxuriant 25-100 >=50% 20-25 °C <=5 d
Saccharomyces cerevisiae ATCC 9763 50-100 luxuriant 35-100 >=50% 20-25 °C <=5 d
Escherichia coli ATCC 25922 >=103 inhibited 0 0% 20-25 °C <=5 d
Escherichia coli ATCC 8739 >=103 inhibited 0 0% 20-25 °C <=5 d
Escherichia coli NCTC 9002 >=103 inhibited 0 0% 20-25 °C <=5 d
Trichophyton rubrum ATCC 28191 50-100 inhibited 0 0% 20-25 °C <=5 d
Lactobacillus casei ATCC 334 >=103 inhibited 0 0% 20-25 °C <=5 d

Storage and Shelf Life

Store below 30°C in tightly closed container and the prepared medium at 2 - 8°C. Use before expiry date on the label.

More Information
Product Name Agar Medium C (Sabouraud-Glucose Agar with Antibiotics)
SKU ME1472
Product Type Regular
Physical Form Powder
Origin Animal
Packaging type HDPE
References 1. European Pharmacopoeia, 2008,European Department, for the Quality of Medicines 2.Sabouraud K., 1892, Ann. Dermatol. Syphilol, 3:1061. 3.Ajello L., 1957, J. Chron. Dis., 5:545.4.Lorian (Ed.),1980, Antibiotics In Laboratory Medicine, Williams and Wilkins, Baltimore. 5.Murray, P. R 2005, In Manual of Clinical Microbiology, 7th ed., ASM, Washington, D.C.
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