title: Scaling-up vaccine production: implementation aspects of a biomass growth observer and controller.
abstract: This study considers two aspects of the implementation of a biomass growth observer and specific growth rate controller in scale-up from small- to pilot-scale bioreactors towards a feasible bulk production process for whole-cell vaccine against whooping cough. The first is the calculation of the oxygen uptake rate, the starting point for online monitoring and control of biomass growth, taking into account the dynamics in the gas-phase. Mixing effects and delays are caused by amongst others the headspace and tubing to the analyzer. These gas phase dynamics are modelled using knowledge of the system in order to reconstruct oxygen consumption. The second aspect is to evaluate performance of the monitoring and control system with the required modifications of the oxygen consumption calculation on pilot-scale. In pilot-scale fed-batch cultivation good monitoring and control performance is obtained enabling a doubled concentration of bulk vaccine compared to standard batch production.
authors.affiliation: Systems and Control Group, Wageningen University, P. O. Box 17, 6700 AA Wageningen, The Netherlands. zita.soons@gmail.com
authors.forename: Zita I T A
authors.initials: ZI
authors.lastname: Soons
authors.forename: Jan
authors.initials: J
authors.lastname: van den IJssel
authors.forename: Leo A
authors.initials: LA
authors.lastname: van der Pol
authors.forename: Gerrit
authors.initials: G
authors.lastname: van Straten
authors.forename: Anton J B
authors.initials: AJ
authors.lastname: van Boxtel
mesh_terms: D000465:Algorithms; D019149:Bioreactors / Q000382:microbiology*; D001886:Bordetella pertussis / Q000166:cytology / Q000502:physiology*; D018929:Cell Culture Techniques / Q000379:methods*; D049109:Cell Proliferation; D003198:Computer Simulation; D005246:Feedback / Q000502:physiology; D006801:Humans; D008954:Models, Biological; D010100:Oxygen / Q000378:metabolism*; D010567:Pertussis Vaccine / Q000096:biosynthesis* / Q000302:isolation & purification; D014917:Whooping Cough / Q000517:prevention & control*
chemical_list: D010567:Pertussis Vaccine; D010100:Oxygen