SEROLOGICAL STUDIES ON BREWING YEASTS

Abstract
In a serological investigation of twelve strains of Saccharomyces carlsbergensis, three strains were found to be antigenically different from the other nine, but no physiological or morphological properties characterized either type. S. rouxii, although antigenically very similar to S. carlsbergensis, was found to be sufficiently different to allow serological differentiation. A preparation is described of a serum which agglutinates three of the twelve S. carlsbergensis strains tested, but not organisms of ten other Saccharomyces spp., including S. cerevisiae, S. ellipsoideus, S. diastaticus and S. rouxii. S. ellipsoideus, S. diastaticus and the remaining strains of S. carlsbergensis were found to be serologically identical and could only be distinguished by fermentation of melibiose and starch.

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