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Purging a fermenting cucumber tank with air rather than nitrogen carries the risk that

  • A.The lactic acid bacteria will be killed outright
  • B.The salt will precipitate out of the brine
  • C.The fruit will absorb far too little salt
  • D.Moulds may grow and soften the fruit

Answer: D

Air removes carbon dioxide just as nitrogen does, but it also supplies oxygen at the surface, and mould growth there brings the pectinolytic enzymes that soften the pickles. Where air purging is used it has to be carefully controlled.

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