Farber Pham Diastaticus Medium (FPDM)

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In conjunction with University of the Sciences, Weber Scientific is pleased to announce the launch of a novel microbiological media for the detection and enrichment of Saccharomyces cerevisiae var. diastaticus. Saccharomyces cerevisiae var. diastaticus is a wild yeast contaminant which represents a major beer spoilage threat. Product contamination has led to costly product recalls as infection may lead to off-flavors, over-attenuation, and over-carbonation, potentially causing gushing beer, exploding packages, or non-compliance with federal reporting of alcohol by volume. Unlike Lin’s Cupric Sulfate Medium (LCSM), this new formulation supports growth of all diastaticus strains tested and inhibits the growth of traditional brewer’s yeast. Brewers can now access a quick and reliable method to test for diastaticus contamination at all points of the brewing process.

  • A wide variation of diastaticus strains will grow on FPDM, including those that will not grow on LCSM, as confirmed by PCR analysis
  • FPDM promotes stronger growth of diastaticus colonies as compared to LCSM alone
  • Growth becomes visible as soon as 48 hours after inoculation when incubated at 30°C
  • FPDM is confirmed to inhibit multiple strains of traditional brewing yeast
  • Some diastaticus strains which promote over-attenuation produce zones of clearing around colonies, allowing easier identification
  • FPDM is able to detect diastaticus strains regardless of the strain’s ability to sporulate or over-attenuate