Abstract
THE substrate specificity of the yeast carbohydrases has been studied by many authors1–3. It has been concluded4,5 that standard industrial yeasts—brewers', distillers' and bakers' yeasts—contain carbohydrases the substrate specificity of which is determined qualitatively only by the nature of the glucosidic terminal unit of the sugar substrate. On this basis, distinction has been made between the following: (1) a beta-fructofuranosidase which catalyses the removal by hydrolysis of the fructofuranosidic terminal from sucrose, raffinose, stachyose, gentianose and beta-methylfructofuranoside, (2) an alpha-glucosidase which catalyses the removal by hydrolysis of the alpha-glucosidic terminal from maltose, sucrose, turanose, melezitose and suitable synthetic alpha-alkyl glucosides and alpha-aryl glucosides, and (3) an alpha-galactosidase, which catalyses the hydrolyses of the alpha-galactosidic terminal from melibiose, raffinose and alpha-phenyl galactoside.
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