Abstract
Two hybridoma cell lines were cultivated in an indirectly aerated 10-1 reactor in batch, fed-batch and continuous (perfusion) operations and in spinner flasks. The medium in the reactor was sampled either by an aseptic cross-flow filtration module integrated into a loop or by an in-situ tubular filter. The glucose concentration was monitored by an on-line flow injection analyser and the ammonia concentration by an ion-selective electrode. Since the membrane transmission of the high-molecular components decreased during cultivation, the product, a monoclonal antibody, was enriched in the reactor. During cultivation, the concentrations of cells, viable cells, glucose, lactase, acetate, citrate, ammonia, urea, amino acids, proteins, and monoclonal antibodies were determined off-line. The specific growth rate, specific production, and consumption rates of the medium components were influenced considerably by the medium composition, especially by the type and amount of serum used.
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