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XCell™ Lab Controller
User Guide
13 repligen.com XC-LAB-UG-V4
5.4
Optimization
It is important to optimize process conditions. The guidelines in this document provide a useful
resource as you plan your process development, but please reach out to your local FAS for
consultation during optimization, scale-up and scale down experimental design or data review.
6.
Overview of the XCell ATF® Technology and process intensification
The XCell ATF® Technology provides a complete solution for the retention of cells, removal of media
and ultimately the intensification of upstream cell culture processes. XCell ATF® Devices are often
used in continuous upstream processes, also called perfusion, but are equally beneficial in fed-batch
and hybrid processes. Examples of application of a cell retention device for fed- batch include:
•
N-1 processes using short periods of perfusion to boost cell growth or regular media exchange
•
High Productivity Harvest (HPH) application for fed-batch gene therapy, vaccine, mAb and
recombinant processes to boost productivity while also eliminating both centrifugation and
depth filtration unit operations.
•
Perfusion for continuous processing
•
Vaccine and viral process intensification
Repligen has an experienced global team of scientists ready to support the development,
optimization, scale-up and troubleshooting of XCell ATF® intensified cell culture processes. For
support or troubleshooting, please contact your local FAS.
A preventative maintenance (PM) contract ensures continued operation of the system at optimal
performance levels. The pneumatic parts that are connected to the controller and SAPA should
always remain free of dust and particles. Refer to
for additional safety precautions.
6.1
Alternating Tangential Flow (ATF) Filtration
The diaphragm pump of the XCell ATF® System generates alternating tangential flow (ATF) through
hollow fiber filters. ATF is a low shear, rapid, pulsating and bi-directional flow of cell suspension
between a bioreactor and a diaphragm pump (
Cell culture moves in a continuous back and
forth motion through the lumen of the hollow fiber filters. Two strokes of the diaphragm pump, the
Pressure stroke (P-stroke) and the Exhaust stroke (E-stroke), complete each back and forth cycle.
Delivery of positive air pressure to the base of the diaphragm by the pressure control valve in the
controller initiates the P-stroke. Positive air pressure pushes the diaphragm up from the
air-side
hemisphere of the device, driving liquid from the diaphragm pump through the lumen of the hollow
fiber filters and back to the bioreactor. Replacement of the positive pressure under the diaphragm
pump with a vacuum initiates the E-stroke. The vacuum pulls the diaphragm down from the
liquid-
side
hemisphere of the device, pulling liquid from the bioreactor through the hollow fiber lumens
and towards the diaphragm pump.