真菌学报第4卷1985年总目录

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Rolle der n-Alkane in Melasse-Nährmedium beim Oberflächenverfahren der Citronensäurefermentation

The investigation of unfitness of beet molasses for citric acid production shows the presence of hydroacarbons in a toxic fraction of lipid extracts derived from antifoaming agents used in the suger industry. The model experiments demonstrate that these compounds dispersed in water solutions of the medium create on the surface of growing spores a layer which isolates them from the surrounding and prevents their normal growth. The inhibition effect of hydrocarbons on Aspergillus niger increases with degree of their dispersion in the water phase and is promoted by surface active substances e.g. emulgators present in antifoaming additives.