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Sauerkraut fermentation is usually complete when

  • A.The salt has fully dissolved into the cabbage juice
  • B.Gas is first observed rising through the brine
  • C.The cabbage has been fully submerged for a day
  • D.Acid production stops because the sugar has been used up

Answer: D

Correct answer: Acid production stops because the sugar has been used up

The fermentation is substrate-limited: it ends when the bacteria have consumed the available sugar, at which point the acidity stops rising and the process is complete. Gas appearing marks the beginning rather than the end, and the salt dissolves within hours.

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