36
CORN I NG ASCENT FBR PD SYSTEM
Figure 7-12.
Auxiliary Phases. Media
Removal is highlighted as an example to
show the phase set up pop-up box.
Table 7-8.
Auxiliary Phases descriptions.
Auxiliary Phases
Description
Substrate Sampling
Stops loops for the user to remove the bioreactor for sampling, prompts for
bioreactor re-install, and stabilizes the DO loops for a specified stabilization
time.
Media Addition
Adds media volume at a user-defined rate, number of cycles and delay time
between cycles.
Bolus Addition
Adds bolus volume at a user-defined rate, number of cycles and delay time
between cycles.
Media Removal
Removes media volume at a user-defined rate and volume.
Perfusion
Removes media to the waste container and adds media to the MCV.
The volume is specified for the media exchange. The user can choose the
number of cycles for removal flow rate as well as addition flow rate, and delay
between systems to minimize transients.
Media Dilution
Removes media from the MCV to the media container and replaces media from
the media container to the MCV.
The volume is specified for the exchange. The user can choose the number
of cycles for removal flow rate independent of addition flow rate, and delay
between systems to minimize transients.
Table 7-7.
Harvest Phases descriptions.
Harvest Phases
Description
Harvest Preparation
All loops – heaters, DO and pH – are turned off. Preparation time to connect
Harvest kit to the bioreactor and fluidically isolate the bioreactor. Harvest
Preparation can only be performed once.
Harvest Wash
The bioreactor is washed with DPBS buffer at a user-specified flow rate.
Harvest wash can be performed more than once.
Cell Release
Accutase® or similar proteolytic cell dissociating enzyme is flown through the
bioreactor at a user-specified duration. Cell Release Phase can be performed
more than once.
Cell Removal
The user sets the air pressure setpoint to help retrieve the majority of the cells
into the collection bottle. Cell Removal Phase can be performed more than
once.
Final Rinse
The user pumps extra wash solution through the bioreactor. Final Rinse can be
performed more than once.
Shutdown
There are no setpoints for the user to enter. The user ends the batch to
generate the process file. All equipment, timers and data logging are stopped.
Shutdown can only be performed once.
Figure 7-12 shows the sequences under Auxiliary Phases. Example: Selecting Media Removal allows a pop-up to set up the phase. Table
7-8 lists all sequences under Auxiliary Phases.