Cultures
Wickerhamiella versatilis
A yeast named in soy-sauce research for its contribution to aroma, especially in early moromi, where the strain and the product decide what it does.
What the yeast is
Wickerhamiella versatilis is a yeast that soy-sauce researchers name as an aroma yeast in moromi, the brined mash that koji has prepared. Its name has changed over time. Older literature calls it Candida versatilis or Torulopsis versatilis, and the culture collections list those names as synonyms or deposit names.
The name identifies the species. Culture-collection records identify individual strains, and the same species name can cover different cultures. The sources reviewed here do not show that every culture under this name behaves the same way.
Strain records
The National Collection of Yeast Cultures lists NCYC 1433 under W. versatilis, with Candida versatilis as its deposit name. It records a deposit in July 1982 by H.P. Foods Ltd., with fermenting soy sauce as its habitat. That is a documented strain record. It is not an origin date for the species.
Other studies name cultures without a matching collection number. A 2025 study of soy-sauce aroma used a yeast it called SKW-1, maintained by a producer in Saga, and no inspected source equates SKW-1 with NCYC 1433. A 2022 study of soy whey used NCYC 1433 in a by-product context.
Role in moromi
A 2019 study compared soy sauces made from different soybean materials with a combined starter of Tetragenococcus halophilus, Zygosaccharomyces rouxii and Candida versatilis. The abstract does not isolate the yeast's contribution or identify its strain.
A 2025 laboratory study paired the yeast with Z. rouxii and reported that adding W. versatilis early gave earlier formation of 4-ethylguaiacol, a compound the authors link to aroma. Ethanol and cell density followed Z. rouxii fermentation. These are results for one strain pair and one medium, not a universal rule for the species.
Where it sits in the process
Koji prepares the substrate, and the yeast is an adjunct added to the mash. It is distinct from the koji mould, from the lactic acid bacterium Tetragenococcus halophilus and from the Zygosaccharomyces rouxii yeast, though research combines them.
The 2025 industrial description separates koji, starter additions and later yeast fermentation into steps. A home maker would need a product that names its strain before any use could be described.
Handling and limits
The sources do not give a stock-storage method, activation routine, shelf life or contamination response for a retained culture. The industrial and laboratory batches in these papers are research or production conditions and do not establish a household method.
Do not judge a culture or a mash by smell, taste, bubbles or a single measurement. The safety of a home batch has not been established by these sources.
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Sources
Journal of the Science of Food and Agriculture 99(13):5687-5695, WileyMethod · Results · Limits
Effect of raw material and starters on the metabolite constituents and microbial community diversity of fermented soy sauceA combined starter set of Tetragenococcus halophilus, Zygosaccharomyces rouxii and Candida versatilis was compared across soybean materials; the abstract does not identify the C. versatilis strain.
Cited in: What the yeast is; Role in moromi
National Collection of Yeast CulturesStrain identity · History
Wickerhamiella versatilis 1433, NCYC catalogueNCYC 1433 is listed as Wickerhamiella versatilis, deposited as Candida versatilis, and deposited in July 1982 by H.P. Foods Ltd. from fermenting soy sauce.
Cited in: What the yeast is; Strain records; Handling and limits
Journal of Bioscience and Bioengineering 139(4):271-279, PubMed recordMethod · Results · Limits
Crucial role of early addition of Wickerhamiella versatilis in enhancing aroma formation during soy sauce fermentationIn a laboratory setup, W. versatilis added before Z. rouxii was reported to give earlier 4-ethylguaiacol production; the strain pair and conditions were specific to the study.
Cited in: Role in moromi
Journal of Bioscience and Bioengineering, ScienceDirect (Elsevier)Methods text · Industrial batch
Crucial role of early addition of Wickerhamiella versatilis in enhancing aroma formation during soy sauce fermentationDescribes the study pair SKW-1 and SKZ-9 and an industrial batch at a cooperative; these do not establish a universal schedule.
Cited in: Where it sits in the process
Bioresource Collection and Research Center, TaiwanStrain identity
Wickerhamiella versatilis NCYC 1433, BCRC strain catalogue record 21887PubMed recordResearch context
Exploring the feasibility of biotransforming salted soy whey into a soy sauce-like condiment using wine yeast Torulaspora delbrueckii and soy sauce yeasts Zygosaccharomyces rouxii and Candida versatilis as single startersTested NCYC 1433 in salted soy whey from tofu production, a by-product context and not soy-sauce moromi.
Cited in: Strain records