VINEGAR AND CITRIC ACID QUIZ

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

Both (a) and (b)

Ammonium salt

Urea

Peptone

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What is the pH of the medium when sucrose is used as substrate for the production of citric acid?

5

4

6

3

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

None of these

HNO3

H2SO4

HCl

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Sugar content of the fermentation medium for citric acid is maintained at

25-30 %

15-20%

10-15%

20-25 %

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Which substrate is used in the fermentation of citric acid?

Beet molasses

Starch hydrolysate

Sucrose

All of these

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

Streptococcus lactis

Saccharomyces cerevisiae

Lactobacillus bulgaricus

Aspergillus niger

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

precipitate calcium phosphate

precipitate calcium sulphate

precipitate calcium citrate

precipitate calcium carbonate

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Malt vinegar is produced from

ethanol

malted grain

ale

fruit juices

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Cider vinegar is produced from

fruit juices

ethanol

malted grain

ale

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