Effect of different Coumarins on production of citric acid by Aspergillus niger NCIM 683

Citric acid has become an important raw material for general industrial use with many varied and expanding applications as in the cleaning and polishing of iron and steel, as a component in certain non-ferrous plastic solutions, and in the treatment and conditioning of industrial water supplies. It is also used in the preparation of alkyl resins, paints and in the printing of calico and textile industries. The present study involve study of citric acid production by fermentation which is defined as the incomplete oxidations of carbohydrate and carbohydrate like materials by microorganisms Aspergillus niger in the presence of different coumarins.