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Item type:Publication, Access status: without files , Stirred Bioreactors: Current State and Developments, With Special Emphasis on Biopharmaceutical Production Processes. Current State and Developments, With Special Emphasis on Biopharmaceutical Production Processes(Elsevier, 2016-09-16); ; ; ; It is undisputed that stirred bioreactors are the most common type of bioreactors for submerged bioprocesses. Stirred bioreactors for biopharmaceuticals, which represent the strongest-growing branch of modern biotechnological products, are the focus of our chapter. They are available in working volumes from milliliters up to 70m3 and are used for a wide range of expression systems that require aseptic conditions. Based on a brief summary of some basic rules for the construction and operation of stirred bioreactors, this chapter will review key engineering issues that affect the design of aseptic stirred bioreactors. We will also provide readers with some general information on transport phenomena in stirred bioreactors before discussing special design aspects and performance parameters for expression systems (mammalian and microbial cells) that prevail in commercial biopharmaceutical production processes. Special attention will be paid to single-use stirred bioreactors, which may have advantages over their reusable counterparts and have become widely accepted over the past years.Publicationtype: Book Part60 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Theoretical and practical issues that are relevant when scaling up hMSC microcarrier production porocesses(Sage-Hindawi, 2016); ; ; ; The potential of human mesenchymal stem cells (hMSCs) for allogeneic cell therapies has created a large amount of interest. However, this presupposes the availability of efficient scale-up procedures. Promising results have been reported for stirred bioreactors that operate with microcarriers. Recent publications focusing on microcarrier-based stirred bioreactors have demonstrated the successful use of Computational Fluid Dynamics (CFD) and suspension criteria (N S1u , N S1) for rapidly scaling up hMSC expansions from mL- to pilot scale. Nevertheless, one obstacle may be the formation of large microcarrier-cell-aggregates, which may result in mass transfer limitations and inhomogeneous distributions of stem cells in the culture broth. The dependence of microcarrier-cell-aggregate formation on impeller speed and shear stress levels was investigated for human adipose derived stromal/stem cells (hASCs) at the spinner scale by recording the Sauter mean diameter (d 32) versus time. Cultivation at the suspension criteria provided d 32 values between 0.2 and 0.7 mm, the highest cell densities (1.25 × 10(6) cells mL(-1) hASCs), and the highest expansion factors (117.0 ± 4.7 on day 7), while maintaining the expression of specific surface markers. Furthermore, suitability of the suspension criterion N S1u was investigated for scaling up microcarrier-based processes in wave-mixed bioreactors for the first time.Publicationtype: Journal ArticleScopus© Citations 44 188 186 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Mass production of mesenchymal stem cells : impact of bioreactor design and flow conditions on proliferation and differentiationThe book serves as a good starting point for anyone interested in the application of tissue engineering. It offers a colorful mix of topics, which explain the obstacles and possible solutions for TE applications. The first part covers the use of adult stem cells and their applications. The following chapters offer an insight into the development of a tailored biomaterial for organ replacement and highlight the importance of cell-biomaterial interaction. In summary, this book offers insights into a wide variety of cells, biomaterials, interfaces and applications of the next generation biotechnology, which is tissue engineering.Publicationtype: Book Part2320 1240