Question
Biology Question on Microbes in human welfare
The citric acid is produced by
A
Candida utilis
B
Azotobacter suboxydans
C
Aspergillus niger
D
Streptococcus lactis.
Answer
Aspergillus niger
Explanation
Solution
Citric acid is produced by aerobic fermentation of sucrose in beet molasses by Aspergillus niger. The fermentation process is completed in about 5-14 days at 27 - 33?C. Citric acid is made available in the market in the form of anhydrous crystalline chemical as powder. Citric acid is used in food industry (e.g. fruit drinks, confectionery, jams, jellies, preserved fruits), pharmacy (e.g. blood transfusion), consmetics (e.g. astringent lotions, shampoos and hair setting fluids), and industries (e.g. electroplating leather tanning).