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- W2069457617 abstract "Batch shake flask studies with Catharanthus roseus demonstrated that alkaloid production commenced only after growth had slowed or ceased. To obtain high alkaloid productivities for extended periods, a hormone-free production medium was used. To develop a readily scalable process, both immobilized and suspended cell systems were studied. In the immobilized cell systems, growth, glucose utilization, and alkaloid production were suppressed; for the case of membrane entrapped cells this suppression was observed to be reversible. Based on the oxygen requirements of the cells, and the oxygen transfer capabilities of a pneumatically agitated bubble column, conditions were established that allowed the growth and production dynamics observed in shake flasks to be reproduced in the air sparged column reactor. The requirement for the aseptic exchange of growth for production medium was satisfied by using a coarse cotton filter and coupling filtration to aeration. With this filtration system, media can be rapidly and completely exchanged and the filter can be quickly and effectively backwashed. By coupling filtration to aeration, a two-stage batch operation can be employed while requiring only a single bioreactor. Studies with this system demonstrated its capabilities for alkaloid production." @default.
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- W2069457617 date "1988-06-05" @default.
- W2069457617 modified "2023-09-24" @default.
- W2069457617 title "Bioreactor considerations for secondary metabolite production from plant cell tissue culture: Indole alkaloids fromCatharanthus roseus" @default.
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- W2069457617 doi "https://doi.org/10.1002/bit.260310903" @default.
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