compared to Alcalase ® . The enzyme stability increased under process conditions, compared to the stability in buffer, due to the stabilizing effect of the substrate. The biochemical characteristics and the hydrolysis performance showed the potential of the novel extracellular peptidases for the hydrolysis of the industrially relevant substrate wheat gluten.
The rehydration behavior of biopolymer powders was investigated. Problems that arise during powder rehydration, e.g., floating and formation of particle aggregates, are mainly attributed to the dynamics of capillary water uptake. Common methods for analysis are too slow to assess the fast changes and do not allow conclusions about causal relationships. For a more detailed understanding, relevant powder properties were investigated. Results show that viscosity development in the rehydration liquid as well as swelling, and in particular their dynamics, are crucial for powder rehydration. The dynamic capillary rise was modeled based on the Washburn equation and results were linked to the physical powder characteristics. The approach allows the evaluation, whether viscosity or swelling effects lead to a critical rehydration behavior.
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