Laboratory bioreactors for cell culture: how can critical parameters be controlled to support cell proliferation?

From screening to scale-up, cell culture bioreactors provide precise control of temperature, pH, dissolved O? and agitation to gently expand CHO, HEK, iPSC or MSC cell lines. In the lab, the bioreactor system combines an autoclavable glass vessel or single-use vessel, sensors and a controller. Bioreactor caps (multi-ports, 0.2 µm filters, probes) ensure a closed, aseptic flow path for sampling and aeration. Result: reproducible cultures, ready for bioproduction or R&D. Bioreactors can operate in different modes: batch (simple culture), fed-batch (gradual nutrient addition) or perfusion (continuous feeding).

What types of bioreactors and accessories for cell culture?

In cell culture, there are several types of laboratory bioreactors. Stirred-tank bioreactors, in glass or single-use, allow precise control of culture parameters such as pH, dissolved oxygen and agitation. They are particularly suited to suspension cultures or microcarrier-based growth, such as CHO or HEK cells. Rocking systems (“rocking”), based on disposable bags, provide gentler mixing. They are simpler to operate and better suited to sensitive cells, as they generate less mechanical stress. Finally, micro-bioreactors enable multiple small-scale cultures in parallel. They are mainly used to rapidly screen different media, additives or feeding strategies before scaling up.

On the consumables side, bioreactor caps play a key role: multiport caps (laboratory screw thread), domes or lids with Luer-Lock ports, PTFE dip tubes, 0.2 µm inlet/outlet filters, silicone septa for sterile sampling and for routing optical probes. They ensure a closed system, reduce contamination risk and simplify the integration of feed, vent/purge or perfusion lines.

Selection criteria: working volume (bench scale 50 mL to 10 L), shear sensitivity, oxygen transfer needs (kLa), sensor accuracy (single-use optical vs electrodes), culture strategy (batch/fed-batch/perfusion), sterility requirements (autoclave or gamma), controller/software compatibility and environmental impact (cleaning water/energy vs bag waste). See the comparison table below.

Type	Principle	Applications
Stirred tank (glass or single-use)	Impeller + sparger, pH/DO control	R&D, seed train, mAb, gentle perfusion
Rocking system (disposable bag)	Rocking motion, low shear	Fragile cells, rapid set-up
Micro-bioreactor	Parallelisation, miniature sensors	Media screening, DoE, optimisation

In which fields are cell culture bioreactors used?

• Biopharma/biotech : production and development of mAbs, recombinant proteins and viral vectors (R&D, pre-clinical).
• Cell therapies : controlled expansion of T cells, NK cells and MSCs in a closed system for increased safety.
• Vaccines : cell line amplification and yield optimisation under aseptic conditions.
• Process development : DoE studies, culture media, antifoam, perfusion, scale-down/scale-up and technology transfer.
• Academic/teaching : understanding critical parameters (pH, DO, kLa, shear) and aseptic best practices.
• Cosmetics and dermatology : cell culture/reconstructed tissues for active-ingredient testing in a controlled environment.
• Agri/food & cellular agriculture : research on cultivated proteins and tissues.
• Environment/toxicology : reproducible in vitro bioassays, reduced variability.

Available bioreactors and closures

Frequently asked questions about cell culture bioreactors

What’s the difference between glass and single-use?
Glass is reusable and remains accurate after CIP/SIP. Single-use simplifies asepsis and cuts changeovers, at the cost of extra waste.

How to choose the impeller?
Favour marine impellers to limit shear on animal cells. Rushton turbines deliver higher oxygen transfer but also higher shear.

Are multiport caps universal?
Check the thread (GL), number of ports, probe/tubing-size compatibility, and the presence of certified 0.2 µm filters.

Batch, fed-batch or perfusion?
Batch = simplicity. Fed-batch = higher yield via feeds. Perfusion = high productivity with cell retention and sustained nutrient supply.

Which sensors for pH/DO in single-use?
Pre-assembled optical sensors (patches) provide reliable readings without breaching sterility and without wet recalibration.

How to limit foam?
Tune aeration, adjust the impeller, use antifoam under control, and fit a foam probe linked to a dosing pump.

Environmental impacts to consider?
Single-use cuts water/energy for cleaning but creates waste. Reusable glass requires CIP/SIP and validation, but limits plastics.