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Articles by Amna Ehsan
Total Records ( 2 ) for Amna Ehsan
  Sikander Ali , Asad-ur- Rehman , Amna Ehsan , Ikram-ul- Haq and Javed Iqbal
  The present investigation deals with the effect of vegetative inoculum on submerged citric acid fermentation by Aspergillus niger using stirred bioreactor. All fermentations were carried out following growth on 15% raw molasses sugars for 144 h. Ferrocyanide (200 ppm) was used to control the trace metals present in the molasses medium. The maximum production of citric acid was obtained when 1.0% vegetative inoculum was used. The dry cell mass and sugar consumption were 18.5 and 96.55 g l-1, respectively. The mycelia were intermediate round pellets in their morphology. The specific productivity (qp = 0.074±0.02a g g-1 cells h-1) was several folds higher than many other workers.
  Ikram-ul- Haq , Amna Ehsan , Waseem Ahmad Butt and Sikander Ali
  The optimization of cultural condition was studied for the production of xylanase by mutant strain of Aspergillus niger GCBMX-45. Submerged fermentation was carried out in 250 ml Erlenmeyer flasks. Medium containing (%w/v) NaNO3, 0.1; Tween-80, 0.2; NH4Cl, 0.1; KH2PO4, 0.1; MgSO4.7H2O, 0.03; CaCl2.2H2O, 0.1; wheat bran, 2 was used for xylanase production. The enzyme production was maximum (195 U ml-1) at pH 4.5. One percent meat extract was added in medium as an additional organic nitrogen source.
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