Effect of fluid dynamics on pellet morphology and product formation of Aspergillus niger

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The formation of biopellets from filamentous fungi, such as Aspergillus niger, is closely linked to pellet morphology. This study investigates the impact of fluid dynamic conditions on fungal pellet growth, providing crucial insights into morphological changes during cultivation in stirred tank reactors. Different volumetric power inputs from agitation and aeration were analyzed, yielding important data on the evolution of pellet morphology. Quantification was achieved through digital image analysis and laser diffraction, focusing on parameters like pellet diameter and concentration. The surface structure of the pellets was examined using microscopic image analysis and verified through sedimentation velocity measurements. Results indicated significant variations in morphological data among pellets cultivated under varying power inputs, which correspondingly affected the production yields of glucoamylase. Additionally, without increasing total energy input, the study demonstrated that optimizing the effects of aeration and agitation on volumetric power input could enhance product formation. This research highlights the potential for improving biopellet production through careful manipulation of cultivation conditions.