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QveST
2 months ago
14

Why will contaminating bacteria make wine sour while pure yeast will not?

Biology
1 answer:
-BARSIC- [2.5K]2 months ago
6 0

Response:

While yeast is harmless and does not impart a sour flavor to wine, bacteria are capable of doing so. Yeast is able to thrive with or without air, but for alcohol production, it needs an anaerobic environment, which is referred to as Fermentation.

Alcoholic fermentation cannot occur in open containers. Bacterial contamination can lead pyruvate to transform into acetic acid, resulting in the alcohol developing a sour taste.

Thus, it is the bacterial contamination that could make the alcohol sour, not the addition of yeast.

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