Abstract
Summary The starch degrading ability of the yeast genera Lipomyces and Schwanniomyces were evaluated on solid and in liquid media. Strains of Lipomyces kononenkoae, L. starkeyi and Schwanniomyces occidentalis utilized 100% of the starch supplied, with biomass yield coefficients of up to 0.52. There was little correlation between the clearing zone diameters on starch agar plates and the extracellular amylase activities. A derepressed mutant strain of L. kononenkoae had the highest α-amylase activity (more than three-fold higher than the other yeasts) and glucoamylase activity (more than five-fold higher), while L. starkeyi exhibited the highest debranching activity. Furthermore, the L. kononenkoae mutant was the only yeast insensitive to glucose repression of its amylases.
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