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Which of the following is the most common method for citric acid production?

Which of the following is the most common method for citric acid production? Correct Answer Submerged fermentation

Submerged fermentation is the most common method for the production of citric acid. It is the most commonly employed technique and it is estimated that about 80 % of the world production of citric acid is obtained by submerged fermentation.

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Which one of the following is most widely used for commercial production of citric acid?