Verglichen mit dem rasanten Fortschreiten in den molekularbiologischen Wissenschaften während der... more Verglichen mit dem rasanten Fortschreiten in den molekularbiologischen Wissenschaften während der letzten Jahrzehnte, konnten die Entwicklungen, der in der industriellen Praxis verwendeten Fermentations- und Downstream-Techniken, bei weitem nicht mithalten. Daraus ergibt sich ein Ungleichgewicht zwischen neuen biologischen Systemen und den industriellen Produktionstechnologien, was zu einer fortwährenden Abnahme der jährlichen Neuanmeldungen von Produktionsprozessen für Biologics führt. In ihrer PAT-Initiative (PAT = Process Analytical Technology) benennt die für die Zulassung von Pharmaprodukten zuständige US-amerikanische Aufsichtsbehörde FDA die Problempunkte, welche verbessert werden müssen, und fordert die Hersteller gleichzeitig auf in wissenschaftlich basierte Ansätze zur Problemlösung zu investieren. Diese Doktorarbeit zeigt am Beispiel der rekombinanten Proteinproduktion mit Escherichia coli - Bakterien verschiedene bioverfahrenstechnische Ansätze, wie diesen Forderungen na...
Device comprising a stirrer and a dialysis module within a culture vessel, wherein the stirrer co... more Device comprising a stirrer and a dialysis module within a culture vessel, wherein the stirrer comprises - a radial transport comprising at least two blades mixer, and - one or more elements of axial transport comprising, each, at least two blades mixer, in which the blades mixer element radial transport are parallel to each other, wherein the outer diameter of all elements of axial transport is equal to or less than the internal diameter of the radial transport, in which all elements of axial transport are individually connected to the element radial transport, in which all elements of axial transport are located within the element radial transport, and in which all the transport elements have fixed spatial orientation with respect to each other.
The production of monoclonal antibodies by mammalian cell culture in bioreactors up to 25,000 L i... more The production of monoclonal antibodies by mammalian cell culture in bioreactors up to 25,000 L is state of the art technology in the biotech industry. During the lifecycle of a product, several scale up activities and technology transfers are typically executed to enable the supply chain strategy of a global pharmaceutical company. Given the sensitivity of mammalian cells to physicochemical culture conditions, process and equipment knowledge are critical to avoid impacts on timelines, product quantity and quality. Especially, the fluid dynamics of large scale bioreactors versus small scale models need to be described, and similarity demonstrated, in light of the Quality by Design approach promoted by the FDA. This approach comprises an associated design space which is established during process characterization and validation in bench scale bioreactors. Therefore the establishment of predictive models and simulation tools for major operating conditions of stirred vessels (mixing, mass transfer, and shear force.), based on fundamental engineering principles, have experienced a renaissance in the recent years. This work illustrates the systematic characterization of a large variety of bioreactor designs deployed in a global manufacturing network ranging from small bench scale equipment to large scale production equipment (25,000 L). Several traditional methods to determine power input, mixing, mass transfer and shear force have been used to create a data base and identify differences for various impeller types and configurations in operating ranges typically applied in cell culture processes at manufacturing scale. In addition, extrapolation of different empirical models, e.g. Cooke et al. (Paper presented at the proceedings of the 2nd international conference of bioreactor fluid dynamics, Cranfield, UK, 1988), have been assessed for their validity in these operational ranges. Results for selected designs are shown and serve as examples of structured characterization to enable fast and agile process transfers, scale up and troubleshooting.
Verglichen mit dem rasanten Fortschreiten in den molekularbiologischen Wissenschaften während der... more Verglichen mit dem rasanten Fortschreiten in den molekularbiologischen Wissenschaften während der letzten Jahrzehnte, konnten die Entwicklungen, der in der industriellen Praxis verwendeten Fermentations- und Downstream-Techniken, bei weitem nicht mithalten. Daraus ergibt sich ein Ungleichgewicht zwischen neuen biologischen Systemen und den industriellen Produktionstechnologien, was zu einer fortwährenden Abnahme der jährlichen Neuanmeldungen von Produktionsprozessen für Biologics führt. In ihrer PAT-Initiative (PAT = Process Analytical Technology) benennt die für die Zulassung von Pharmaprodukten zuständige US-amerikanische Aufsichtsbehörde FDA die Problempunkte, welche verbessert werden müssen, und fordert die Hersteller gleichzeitig auf in wissenschaftlich basierte Ansätze zur Problemlösung zu investieren. Diese Doktorarbeit zeigt am Beispiel der rekombinanten Proteinproduktion mit Escherichia coli - Bakterien verschiedene bioverfahrenstechnische Ansätze, wie diesen Forderungen na...
Device comprising a stirrer and a dialysis module within a culture vessel, wherein the stirrer co... more Device comprising a stirrer and a dialysis module within a culture vessel, wherein the stirrer comprises - a radial transport comprising at least two blades mixer, and - one or more elements of axial transport comprising, each, at least two blades mixer, in which the blades mixer element radial transport are parallel to each other, wherein the outer diameter of all elements of axial transport is equal to or less than the internal diameter of the radial transport, in which all elements of axial transport are individually connected to the element radial transport, in which all elements of axial transport are located within the element radial transport, and in which all the transport elements have fixed spatial orientation with respect to each other.
The production of monoclonal antibodies by mammalian cell culture in bioreactors up to 25,000 L i... more The production of monoclonal antibodies by mammalian cell culture in bioreactors up to 25,000 L is state of the art technology in the biotech industry. During the lifecycle of a product, several scale up activities and technology transfers are typically executed to enable the supply chain strategy of a global pharmaceutical company. Given the sensitivity of mammalian cells to physicochemical culture conditions, process and equipment knowledge are critical to avoid impacts on timelines, product quantity and quality. Especially, the fluid dynamics of large scale bioreactors versus small scale models need to be described, and similarity demonstrated, in light of the Quality by Design approach promoted by the FDA. This approach comprises an associated design space which is established during process characterization and validation in bench scale bioreactors. Therefore the establishment of predictive models and simulation tools for major operating conditions of stirred vessels (mixing, mass transfer, and shear force.), based on fundamental engineering principles, have experienced a renaissance in the recent years. This work illustrates the systematic characterization of a large variety of bioreactor designs deployed in a global manufacturing network ranging from small bench scale equipment to large scale production equipment (25,000 L). Several traditional methods to determine power input, mixing, mass transfer and shear force have been used to create a data base and identify differences for various impeller types and configurations in operating ranges typically applied in cell culture processes at manufacturing scale. In addition, extrapolation of different empirical models, e.g. Cooke et al. (Paper presented at the proceedings of the 2nd international conference of bioreactor fluid dynamics, Cranfield, UK, 1988), have been assessed for their validity in these operational ranges. Results for selected designs are shown and serve as examples of structured characterization to enable fast and agile process transfers, scale up and troubleshooting.
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Papers by Marco Jenzsch