CORN MEAL POLYSORBATE AGAR

Technical Data #1838a / 2013.06.12

Corn Meal Agar is used for the cultivation of pathogenic fungi and to demonstrate Candida chlamydospore production. Addition of polysorbate 80 stimulates chlamydoconidies production.

 


 

FORMULA
in grams per liter purified filtered water

Corn Meal, Infusion from

50,0

Agar

15,0

Polysorbate 80

10 ml

pH 6.0 +/- 0,2 25 C

This approximate formula may be adjusted and/or enriched to obtain best results.


PRECAUTIONS
This medium is for IN VITRO diagnostic use only.


STORAGE
Store prepared media at 2-8 C protected from direct light and dehydrated powder, in a dry place, in tightly-sealed containers at 2-25 C.


SIGN OF DETERIORATION
Media should not be used if the expiry date has passed. Prepared media should not be used if there are signs of contamination or deterioration (shrinking, cracking, evaporation or discoloration). Do not use dehydrated media if it is caked.


DIRECTIONS
Suspend 17 g of dehydrated media in 1000 ml of purified filtered water. Heat with frequent agitation and boil for one minute. Add 10 ml of Polysorbate 80 (8465). Sterilize at 121 C for 15 minutes. Cool to 45-50 C. Mix gently and dispense into sterile Petri dishes.


PROCEDURE
Prior to inoculate, the prepared media should be brought to room temperature.

  1. Inoculate plates in a straight line with similar 2-3 colonies Streak back and forth then stab across streaked lines. Cover the stab lines with a cover slip.
  2. Incubate at room temperature for 48 hours.
  3. Examine the plates microscopically.


QUALITY CONTROL

Results after 48 hrs at 25C

Organisms

ATCC

Growth

Chlamydospores

Candida albicans

10231

+

+

Candida tropicalis

750

+

+

Candida krusei

14243

+

-


LIMITATIONS OF METHOD
This medium is only a part of the identification. Other tests may be required.


REFERENCES

  1. Lennette, E.H., Ballows, A., Hausler, W.J.Jr., and Shadomy, H.J. Manual of Clinical Microbiology. 4th ed. 1985 Washington D.C.: American society for Microbiology.
  2. Mac Faddin, Jean F., Media for Isolation-Cultivation-Identification-Maintenance of Medical Bacteria Vol.1 1985 Baltimore, MD. Williams & Wilkins.
  3. Walker, L., M. Huppert 1960 Corn Meal-Tween Agar: an improved medium for the identification of Candida albicans. Tech. Bull. Reg. Med. Technol. 30:10-14


CATALOGUE NUMBERS

Dehydrated media 500 g QB-39-1108
     
Polysorbate 80 100 ml 8465
     
Prepared media    
Plates, 100x15 mm 10/pkg 1838
Mono-Plates, 100x15 mm 10/pkg 1038M

 


 





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