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Q.
Which of the microorganisms is used for production of citric acid in industries?
Punjab PMETPunjab PMET 2010
Solution:
At one time, citric acid was commercially prepared from concentrated lemon juice. But now its main source is the fermentation of sugar with Aspergillus niger.
Citric acid has extraordinary range of uses. It gives tartness and flavour to the food. It is an antioxidant and $pH$ adjuster in many foods and dairy products, it often serves as an emulsifier.