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Carbon dioxide produced early in sauerkraut fermentation is useful because it

  • A.Sterilises the exposed surface of the shredded cabbage
  • B.Displaces oxygen and helps keep conditions anaerobic
  • C.Raises the pH of the brine back towards neutral
  • D.Supplies carbon to feed the lactic acid bacteria

Answer: B

The gas flushes air out of the vat, which suppresses moulds and film yeasts and protects the vitamin C and the colour of the cabbage. It is a waste product, not a nutrient, and dissolving in water it acidifies very slightly rather than raising the pH.

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