Faber Pham Diastaticus Media

Faber Pham Diastaticus Media

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In conjunction with University of the Sciences and Weber Scientific. WHClab is pleased to announce the launch of a novel microbiological media for the detection and enrichment of Saccharomyces cerevisias 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.

Below are some of the features of this new medium:

  • 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
  • Samples can be taken from fermenting beer, finished beer, yeast 
    slurries, and environmental swabs
  • Diastaticus strains which promote over-attenuation produce zones of clearing around colonies, allowing easier identification
  • FPDM will detect diastaticus strains regardless of the strain’s ability to sporulate or over-attenuate

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