How to Choose a Bioreactor or Fermenter: A Buyer's Guide for Bioprocess and Research Labs

Bioreactors and fermenters are the core of any bioprocess development or manufacturing workflow. Selecting the right system requires matching vessel type, control capabilities, and scale to your organism, process stage, and regulatory environment. This guide covers the key decision points for labs and manufacturers sourcing bioreactors.

Bioreactor vs. Fermenter

The terms bioreactor and fermenter are often used interchangeably, but there is a distinction. Fermenters traditionally refer to systems designed for microbial culture (bacteria, yeast, fungi) that can withstand higher agitation and aeration rates. Bioreactors is the broader term that includes systems for mammalian, insect, and plant cell culture, which require gentler agitation and more precise environmental control. Most modern systems are designed to handle both applications with appropriate impeller and sparger configurations.

Scale: Bench, Pilot, and Production

Bench-scale bioreactors from 0.5-20 L working volume are the standard for process development, clone screening, and early-stage optimization. Pilot-scale systems from 20-200 L bridge development and manufacturing and are used for process validation and seed train expansion. Production-scale systems above 200 L are custom-engineered for GMP manufacturing. Most research and development labs require bench-scale systems, with pilot-scale units for late-stage development.

Stirred Tank vs. Wave vs. Single-Use

Stirred tank bioreactors use mechanical agitation and are the most versatile and widely used format for both microbial and mammalian culture. Wave bioreactors use rocking motion to mix and oxygenate culture in a disposable bag, offering low shear and easy scale-up for mammalian cell culture. Single-use bioreactors eliminate cleaning validation and reduce cross-contamination risk, making them increasingly preferred for GMP manufacturing and multi-product facilities.

Control Parameters

Essential control parameters for most bioprocesses include temperature, pH, dissolved oxygen (DO), agitation speed, and gas flow rates. Advanced systems add CO2 control, foam detection, and nutrient feeding control. Confirm that the bioreactor's control system supports all parameters required for your process before purchasing.

GxP and Regulatory Considerations

For GMP manufacturing applications, confirm that the bioreactor supports 21 CFR Part 11 electronic records, provides full process data logging and audit trails, and has validation documentation (IQ/OQ/PQ) available. Research-grade systems typically lack these features. Single-use systems simplify cleaning validation but require extractables and leachables (E&L) data for regulatory submissions.

New vs. Refurbished Bioreactors

Refurbished stirred tank bioreactors from Eppendorf, Sartorius, and Getinge can offer significant cost savings for process development applications. Key checks include vessel integrity, sensor calibration, control system function, and motor and agitation performance. For GMP manufacturing, new or fully requalified systems with current validation documentation are strongly preferred.

Source Bioreactors from mLab Supply

mLab Supply sources new, refurbished, and surplus bioreactors and fermenters from Eppendorf, Sartorius, Thermo Fisher, and Getinge for research, biotech, and bioprocess laboratories. Submit a quote request and we will confirm current availability, vessel configuration, and lead time within 1-2 business days.

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Frequently Asked Questions – Bioreactor Buyer's Guide

What working volume do I need for process development?

Most process development work begins at 1–5 L working volume for clone screening and initial optimization, scaling to 10–20 L for process characterization. Confirm your scale-up strategy before selecting a vessel size to ensure the platform supports your target production scale.

Should I choose a stirred tank or single-use bioreactor?

Stirred tank bioreactors offer maximum flexibility and are reusable, making them cost-effective for long-term process development. Single-use bioreactors eliminate cleaning validation and reduce cross-contamination risk, making them preferred for GMP manufacturing and multi-product facilities. Many labs use stirred tanks for development and single-use systems for manufacturing.

What control parameters are essential for mammalian cell culture?

Temperature, pH, dissolved oxygen (DO), agitation speed, and CO₂ are the essential control parameters for mammalian cell culture. Confirm the bioreactor's control system supports all five parameters with appropriate sensor types and control loops before purchasing.

Can mLab Supply source bioreactors with specific vessel sizes and control configurations?

Yes. Submit a quote request specifying your required working volume, vessel type, organism type, and control parameter requirements and we will confirm available options and lead time.