• question_answer
                Which of the micro-organisms is used for production of citric acid in industries?                    

    A)               Lactobacillus bulgaris                                      

    B)              Pencillium citrinum

    C)               Aspergillus niger

    D)              Rhizopus nigricans

    Correct Answer: C

    Solution :

                                                              At one time, citric acid was commercially prepared from concentrated lemon juice. But now its main source is the fermentation of sugar with A niger.             Citric acid has an extraordinary range of uses. It gives tartness and flavor to the foods. It is an antioxidant and pH adjuster in many foods and dairy products, it often serves as an emulsifier.

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