YPG Agar

Composition

Formula adjusted, standardized to suit performance parameters

Directions

Suspend 50.0 grams in 1000 ml distilled water containing 30 ml glycerol. Heat to boiling to dissolve the medium completely.

Sterilize by autoclaving at 15 lbs pressure (121°C) for 15 minutes.

Principle And Interpretation

General methods in yeasts genetics specify using yeast extract, peptone medium for cultivating Saccharomyces cerevisiae and other yeasts. The yeast extract allows faster growth so that during exponential or log-phase growth, the cells divide every 90 minutes. Peptic digest of animal tissue is as a source of carbon, nitrogen, vitamins and minerals.

Quality Control

Appearance
Cream to yellow homogeneous free flowing powder

Gelling
Firm, comparable with 2.0% Agar gel.

Colour and Clarity of prepared medium
Light amber coloured clear to slightly opalescent gel forms in Petri plates.

Cultural Response
M1368: Cultural characteristics observed after an incubation at 25-30°C for 48-72 hours.

*Key: Formerly known as Aspergillus niger

Storage and Shelf Life

Store below 30°C and use freshly prepared medium. Use before expiry date on the label.