Abstract
The use of commercially available materials in a minimal medium contributes to the simplicity, reliability, and reproducibility of a method described to demonstrate carbohydrate fermentation reactions by yeasts. The medium consists of 1% yeast extract and 2% test carbohydrate in distilled water, dispensed in a modified Durham fermentation tube. Carbohydrate fermentation patterns can usually be obtained within a period of 7 days. The ability of yeasts to ferment carbohydrates is determined strictly on the basis of gas production from the substrate. The method proved reliable in reproducing established fermentation patterns for 112 different yeast strains representing 13 separate genera.
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