Culture medium for beer-spoiling yeast, and method for detecting beer-spoiling yeast

A culture medium with erythritol selectively cultivates harmful yeast in beer-flavored beverages by inhibiting beer-brewing yeasts, enabling effective detection of Yarrowia species without complex equipment.

WO2026140987A1PCT designated stage Publication Date: 2026-07-02ASAHI GRP HLDG LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
ASAHI GRP HLDG LTD
Filing Date
2025-12-15
Publication Date
2026-07-02

AI Technical Summary

Technical Problem

Existing methods struggle to selectively detect harmful yeast in beer-flavored beverages, particularly those with characteristics similar to beer-brewing yeast, due to their similar growth requirements, leading to difficulties in distinguishing and detecting trace amounts amidst a large population of brewing yeast.

Method used

A culture medium containing only erythritol as a sugar source, optionally with liquid oil and an emulsifier, is used to selectively cultivate and detect harmful yeast like Yarrowia species, while inhibiting the growth of beer-brewing yeasts such as Kluyveromyces and Saccharomyces.

Benefits of technology

The culture medium effectively allows for the selective growth and detection of harmful yeast, such as Yarrowia, without interference from beer-brewing yeasts, even after long-term storage, using a simple and cost-effective method.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present invention provides: a culture medium for beer-spoiling yeast that contains only erythritol as a sugar source; the culture medium described above that also contains a liquid oil and an emulsifier; and a method for selectively detecting beer-spoiling yeast, the method comprising a culture step for culturing a test sample using a culture medium for beer-spoiling yeast and an evaluation step for evaluating the presence or absence of beer-spoiling yeast in the test sample after the culture step, and the culture medium for beer-spoiling yeast containing only erythritol as a sugar source.
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