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Citric acid production from a local isolate of the fungus Aspergillus niger by standerd medium | ||
| Tikrit Journal of Pure Science | ||
| Article 1, Volume 13, Issue 2, 2008, Pages 207-214 | ||
| Author | ||
| Wala Hamdoon Shuker | ||
| Abstract | ||
| In this study , five strains of Aspergillus niger have been isolated and characterized from different sources (air, soil, onion leaves , gulkan and sugar beet leaves ). These strains were used to produce citric acid by one of the structural medium . The production of citric acid from the different strains were compared . It was shown that the strain of Aspergillus niger 3 was best one in citric acid production and it was given the highest production (24.45 gm/L) after 9 days of incubation. Also it was clear that the sucrose and clucose were the best carbon sources for the maximum production of citric acid .The Production of citric acid was increased by the increasing of sucrose ,(29.86g/L) citric acid obtained when sucrose concentration was 18 % . Optimum initial pH for acid production was 2.5 . The addition of ethanol stimulate citric acid production especially at the concentration 1%. | ||
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