Question

For the manufacture of gluconic acid and citric acid, which of the following micro-organism is used?

• A. Lactobacillus bulgaricus
• B. Acetobacter sp.
• C. Aspergillus niger
• D. Gluconobacter sp.

Answer 1

The correct option is C Aspergillus niger

Aspergillus niger is cultured for the industrial production of many substances. Various strains of A. niger are used in the industrial preparation of citric acid and gluconic acid and have been assessed as acceptable for daily intake by the World Health Organisation. Gluconic acid is produced, during glucose oxidation by most Aspergillus sps. A. niger fermentation is generally recognized as safe (GRAS) by the United States Food and Drug Administration under the Federal Food, Drug, and Cosmetic Act.