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A rise in pH with the appearance of butyric and propionic acids late in a cucumber fermentation indicates

  • A.A normal and desirable stage of the fermentation
  • B.That the brine was made up too strong at the start
  • C.That the fruit was harvested when it was too small
  • D.Secondary spoilage, often by spore-forming anaerobes

Answer: D

Once the lactic acid is consumed the pH climbs and clostridia and other anaerobes can grow, producing butyric and propionic acids and a foul smell. It is a genuine spoilage and not a stage the process is meant to pass through.

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