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Vinegar and Citric Acid

Vinegar and Citric Acid
Sugar content of the fermentation medium for citric acid is maintained at

25-30 %
20-25 %
10-15%
15-20%

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Vinegar and Citric Acid
Which of the following nitrogen sources is added in the fermentation medium of citric acid production?

Urea
Ammonium salt
Both (a) and (b)
Peptone

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Vinegar and Citric Acid
Which of the following microorganism is used for the production of citric acid?

Lactobacillus bulgaricus
Aspergillus niger
Saccharomyces cerevisiae
Streptococcus lactis

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

6
3
4
5

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Vinegar and Citric Acid
In liquid surface culture process for the fermentation to produce citric acid,

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
both (a) and (b)

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Vinegar and Citric Acid
Malt vinegar is produced from

malted grain
ale
fruit juices
ethanol

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