National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Aspergillus niger inoculated into medium containing Tricalcium phosphate (TCP) and Rock phosphate (RP) resulted in acid production which is indicated from the measure of pH and titrable acidity. Maximum of 105 mM acid production is recorded in TCP supplemented culture of 12 days whereas it is 124 mM in nutrient medium aided with RP and 14 days old culture. At the same time, decline of pH has also been observed in media containing TCP and RP. However, fungal biomass did not show any impact of both the kind of P sources. Chromatographic analysis of culture filtrate has showed the presence of citric and oxalic acid in TCP and RP respectively. Cultural conditions of different range of pH and incubation temperature do not play an important role in organic acid secretion by the fungi but organic acid secretion is mostly influenced by the nutritional sources such as carbon and nitrogenous compounds present in the medium.
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