Increasing product concentrations are achieved in biotechnological production processes for proteins. Hence, the subsequent isolation and purification of proteins using state of the art technologies becomes more and more economically challenging. Protein crystallization could contribute to a simplification of the downstream processing. In this work, suitable crystallization conditions for five different proteins were characterized in microbatch experiments. Parallel operated stirred-tank reactors on a milliliter scale were applied to increase the yield of the protein crystallization processes to up to 99 % within 2 hours by temperature shifts, the addition of crystallization agents, or the addition of novel additives, i.e., ionic liquids. The scale-up based on geometrically similar stirred-tanks up to the liter-scale was successful. Additionally, the crystallization agents could be depleted from the crystals by diffusion.
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Increasing product concentrations are achieved in biotechnological production processes for proteins. Hence, the subsequent isolation and purification of proteins using state of the art technologies becomes more and more economically challenging. Protein crystallization could contribute to a simplification of the downstream processing. In this work, suitable crystallization conditions for five different proteins were characterized in microbatch experiments. Parallel operated stirred-tank reactor...
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