Author Archives: Michelet Dorceus

Cell Culture Scale-Up in Stirred-Tank Single-Use Bioreactors

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Bioprocess development usually is carried out in systems with small working volumes. This helps save time and resources because, at small scale, several experiments can be conducted in parallel. Costs for media are kept low, and relatively little laboratory space is required to operate small-scale bioreactors. But over the course of development, biopharmaceutical companies need more material for characterization, trial runs, and finally for commercialization. They transition to bench scale and then up to pilot or production scale with the…

December 3, 2018

Comparing Culture Methods in Monoclonal Antibody Production: Batch, Fed-Batch, and Perfusion

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Recombinant protein manufacturing with Chinese hamster ovary (CHO) cells represents over 70% of the entire biopharmaceutical industry (1). In fact, human monoclonal antibodies (hMAbs) produced by CHO cells have played a major role in both the diagnostic and therapeutic markets for decades. One of the first human–mouse chimeric MAbs to obtain FDA approval was Roche’s rituximab treatment for non-Hodgkin’s lymphoma, chronic lymphocytic leukemia, and rheumatoid arthritis. Since that approval in 1997, scores of chimeric, humanized, and human MAbs have gained…

March 20, 2017

Single-Use Technologies: BIO Theater @ Interphex 2015

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Andrew Lidums (NA business development manager, Parker domnick hunter) 2:30–2:55 pm Implementing a Risk-Management–Based Approach to the Prevention of Mycoplasma Contaminations Lidums began with a recent report from Genentech, where a 150-µm long Leptospira organism from a drainage ditch outside the facility managed to penetrate 0.1-µm filters. The company solved this problem by lowering the temperature of the filtration operation, which made the bacteria more rigid and kept them from getting through. Clearly, however, contaminations happen even at large facilities.…

August 24, 2015