Methods


Yeast Petrifilm Count
Rapid Yeast Petrifilm Count
Yeast Membrane Filtration Count
Yeast Pour Plate Count*
Yeast Spread Plate Count
Air Sediment Yeast Count

Method References


3M Petrifilm Yeast and Mold Count Plates Interpretation Guide
Standard Methods for the Examination of Dairy Products
Compendium of Methods for the Microbiological Examination of Foods

Sample Size


Plating: 50g
Membrane Filtration: 100 mL

Estimated Turn Around Time


5 Days

Reporting Unit


Spread/Pour Plate and Petrifilm: cfu/mL, cfu/g, cfu/sampled area
 
Membrane Filtration: cfu/100ml
 
Air Sediment is a direct count cfu

Limit of Detection


N/A

Method Description


Samples are prepared and dilutions made. The samples are then plated on media and incubated based on method specifications. After incubation plates are read and results generated based on countable range.

Additional Information


Yeast is a single cell organism, classified as part of the fungus kingdom. It is commonly used to leaven foods and ferment sugar in alcoholic beverages. However yeasts can lead to food spoilage and can also cause candidiasis in certain individuals.
 
These procedures enumerates the amount of yeast present in a sample using a spread plate, pour plate, petrifilm or air sediment method.
 
Also see Mold, as these tests are typically performed together.

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