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Production of citric acid by aspergillus sp isolated from different sources


, : Production of citric acid by aspergillus sp isolated from different sources. Journal of Research Punjab Agricultural University 19(1): 44-50

About 300 isolates of Aspergillus sp. were tested for the production of citric acid using molasses and cane sugar as C sources. Two culutres, 1 each isolated from soil and orange rind, giving high yield in molasses and cane sugar medium, respectively, were used to standardize the optimum citric acid production. High yields of citric acid were obtained with 20% sugar, 0.2% ammonium nitrate, 0.1% potassium dihydrogen phosphate and a pH of 3.5 in a medium containing cane sugar as a sole C source. Organic metabolic inhibitors like napthol, resorcinol, cresol and benzaldehyde increased thet yield of citric acid when present in 1000, 2000, 3000 and 4000 ppm, respectively.

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