Wine from Raisin Water: An Absurd Experiment with a Serious Answer
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A group of Japanese scientists recently published a study asking a simple question: can you make wine from raisin water? Without adding yeast?
the answer: yes.
The Experiment Was Surprisingly Simple
The researchers took water and organic raisins (actually: uncoated, additive-free raisins). That’s it. No commercial yeast, no temperature control, no tricks. Only a water seal to close the jar.
Within days it started to fizzle.After weeks, the sugar had disappeared from the raisins and the alcohol was present.The mixture behaved as if nature itself decided to make wine.
Where Does Fermentation Come From?
The secret is in the raisin peel. wild yeasts still live there, especially Saccharomyces cerevisiae.Also,other species such as Schizosaccharomyces and Zygosaccharomyces join in.These sleeping cells wake up in water. They then do what they always do: convert sugar into alcohol.
DNA analysis showed that this was no coincidence. The active yeasts were precisely the types that dominate wine fermentation. The process was therefore a full-fledged spontaneous fermentation.
How ‘Wine’ was the Result?
Chemically surprisingly wine-like.The samples had an alcohol content between 63 and 95 grams per liter. That is comparable to regular wine. The acid balance was correct. Volatile components indicated yeast metabolism. Phenolics would be expected.