VINEGAR AND CITRIC ACID QUIZ

Which of the following microorganism is used for the production of citric acid?

Lactobacillus bulgaricus

Aspergillus niger

Streptococcus lactis

Saccharomyces cerevisiae

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YOUR ANSWER : ?

In liquid surface culture process for the fermentation to produce citric acid,

both (a) and (b)

A. niger is used with solid substrate as sweet potato

Fungal mycelium grows through out the solution in a deep tank

A. niger floats on the surface of solution

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YOUR ANSWER : ?

In submerged process for the fermentation to produce citric acid,

A. niger is used with solid substrate as sweet potato

both (a) and (b)

Fungal mycelium grows through out the solution in a deep tank

A. niger floats on the surface of solution

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Ethanol is oxidized to acetic acid aerobically using

Lactobacillus

Gluconobacter

both (a) and (b)

Acetobacter

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During recovery step of citric acid, calcium citrate formed is treated with which of the following acid to precipitate calcium?

HCl

H2SO4

None of these

HNO3

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Vinegar production consists of

aerobic fermentation followed by anaerobic fermentation

anaerobic fermentation followed by aerobic fermentation

anaerobic fermentation

aerobic fermentation

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Which of the following nitrogen sources is added in the fermentation medium of citric acid production?

Ammonium salt

Urea

Both (a) and (b)

Peptone

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For the recovery of citric acid after fermentation, Ca(OH)2 is added to the slurry to

precipitate calcium sulphate

precipitate calcium carbonate

precipitate calcium citrate

precipitate calcium phosphate

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Spirit vinegar is produced from

ale

malted grain

fruit juices

ethanol

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Malt vinegar is produced from

malted grain

ale

fruit juices

ethanol

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