A comparative study on the formation of citric acid and polyols and on morphological changes of three strains of free and immobilized Aspergillus niger |
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| Authors: | Sanaa Hamdy Omar Siegfried Honecker Hans-Jürgen Rehm |
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| Affiliation: | (1) Institut für Mikrobiologie der Westfälischen Wilhelms-Universität, Corrensstrasse 3, W-4400 Münster, Federal Republic of Germany;(2) Present address: Botany Department, Faculty of Science, Moharram Bey, Alexandria University, Alexandria, Egypt |
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| Abstract: | Summary The formation of citric acid, oxalic acid, erythritol and glycerol by three strains of Aspergillus niger immobilized in calcium alginate was investigated and compared with that of free cells when cultivated in shake flasks under phosphate limitation. Morphological changes were followed using an electron microscope. The production of acids and polyols, the consumption of glucose and fructose, and also the morphological changes were strain-dependent. The results also reflected the influence of long storage of a strain on productivity, morphological behaviour and phosphate consumption.Offprint requests to: H.-J. Rehm |
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