Citric acids are industrially important molecules which are play potent role in
preprocessing, bioremediation and brewing industries. Hence, our study focuses on
production of citric acid by optimizing the conditions. Aspergillus niger was
isolated from the spoiled coconut and it was studied for citric acid production. The
citric acid production was optimized by screening different fermentation
parameters which gives high yield. pH 3.5 gives higher production of citric acid
(82.65 g l-1) and the temperature 30 °C showed maximum yield 80.68 g l-1
. However, inoculum size and time course playing main role by producing maximum amount of citric acid at 5% inoculum (83.24 g l-1) and 192 hrs (85.18 g l-1) of incubation respectively. Our study reveals the optimum conditions for citric acid production are pH - 3.5, temperature 30 °C, inoculum level - 5% and the time
course - 192 hrs.