Publication

k(L)a as a predictor for successful probe-independent mammalian cell bioprocesses in orbitally shaken bioreactors

Florian Maria Wurm, David Hacker, Lucia Baldi Unser, Stéphanie Tissot
2012
Journal Articles

Abstract

The aim of this study was to gain a better understanding of orbitally shaken bioreactors (OSRs) operated without controllers for pH and dissolved oxygen (DO) concentration. We used cylindrical OSRs with working volumes ranging from 250mL to 200L to determine that the volumetric mass transfer coefficient of oxygen (k(L)a) is a good predictor of the performance of OSRs at different scales. We showed that k(L)a values of 7-10hour(-1) were required to avoid DO limitations and to prevent conditions of low pH during the cultivation of CHO cells. Overall, cell cultures in probe-independent OSRs of different nominal volumes ranging from 250mL to 200L achieved similar cell densities, recombinant protein concentrations, and pH and DO profiles when having the same k(L)a. We conclude that k(L)a is a key parameter for probe-independent bioprocesses in OSRs and can be used as a scale-up factor for their operation.

Official source

https://infoscience.epfl.ch/entities/publication/b1eb6089-b65f-47f1-a0d6-08ac3a67168c

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Florian Maria Wurm, David Hacker, Lucia Baldi Unser, Stéphanie Tissot
2012
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/b1eb6089-b65f-47f1-a0d6-08ac3a67168c

About this result

Related concepts (18)

Cell culture

Cell culture or tissue culture is the process by which cells are grown under controlled conditions, generally outside of their natural environment. The term "tissue culture" was coined by American pathologist Montrose Thomas Burrows. This technique is also called micropropagation. After the cells of interest have been isolated from living tissue, they can subsequently be maintained under carefully controlled conditions. They need to be kept at body temperature (37 °C) in an incubator.

Primary cell culture

Primary cell culture is the ex vivo culture of cells freshly obtained from a multicellular organism, as opposed to the culture of immortalized cell lines. In general, primary cell cultures are considered more representative of in vivo tissues than cell lines, and this is recognized legally in some countries such as the UK (Human Tissue Act 2004). However, primary cells require adequate substrate and nutrient conditions to thrive and after a certain number of divisions they acquire a senescent phenotype, leading to irreversible cell cycle arrest.

Tissue culture

Tissue culture is the growth of tissues or cells in an artificial medium separate from the parent organism. This technique is also called micropropagation. This is typically facilitated via use of a liquid, semi-solid, or solid growth medium, such as broth or agar. Tissue culture commonly refers to the culture of animal cells and tissues, with the more specific term plant tissue culture being used for plants. The term "tissue culture" was coined by American pathologist Montrose Thomas Burrows.

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