Sartorius Biostat STR vs Thermo HyPerforma vs Cytiva Xcellerex: Single-Use Bioreactor Comparison

Key differences at a glance

• Sartorius Biostat STR: top-driven magnetically coupled shaft with 2× 3-blade segment impellers, 50–2,000 L, Flexsafe STR bags, deepest CDMO adoption, factory-integrated Repligen XCell ATF option, ~15% market share.
• Thermo HyPerforma S.U.B.: bottom-mounted pitched-blade impeller, 50–2,000 L with 2:1 or 5:1 turndown BioProcess Container bags, and a separate DynaDrive line that extends to 3,000 L and 5,000 L cube-shaped vessels with 250 L minimum working volume — the only 5,000 L SUB on the market.
• Cytiva Xcellerex XDR: off-centred, four-pitched-blade bottom-mounted impeller, 10–2,000 L with 5:1 turndown, combined micro and macrosparger options, optional perfusion loading door at 1,000–2,000 L, integrates with the Cytiva ReadyToProcess X-platform continuous downstream stack.
• Best for scaling past 2,000 L: Thermo HyPerforma DynaDrive (only platform reaching 5,000 L).
• Best for CDMO tech transfer: Sartorius Biostat STR (installed at Samsung, WuXi, Boehringer Ingelheim).

Side-by-side comparison

Values reflect the vendors' published Generation 3 (Sartorius), classic S.U.B. 5:1 and DynaDrive (Thermo), and X-platform-refreshed XDR (Cytiva, March 2025) datasheets. Your current-datasheet specifications take precedence. See the single-use bioreactor selection guide for the stirred-tank vs wave vs fixed-bed decision upstream of vendor choice.

Sartorius Biostat STR in detail

The Sartorius Biostat STR, currently in its Generation 3 platform, is the workhorse single-use stirred-tank bioreactor for mammalian cell culture across process development, clinical manufacturing, and commercial biologics production. The family spans five vessel sizes — 50, 200, 500, 1,000, and 2,000 L working volume — and pairs with the Flexsafe STR bag family under a design paradigm Sartorius calls "one-for-all scale-up," where the same conical impeller geometry, sparger topology, and H/D ratio scale unchanged from 50 L bench to 2,000 L production.

How it works

The Biostat STR uses two 3-blade segmented impellers on a magnetically coupled centre-line shaft, top-driven by an AC motor sitting on the vessel head plate. The Flexsafe STR bag installs into a jacketed stainless-steel holder that provides thermal control (typical 4–40 °C for mammalian culture), load-cell weight measurement, and mechanical support during agitation. Gas delivery is via a choice of ring sparger (typical for macro-oxygenation with air/oxygen at 0.02–0.1 vvm) or micro sparger (used when the process pushes into higher kLa territory at high cell density). Published engineering characterisation by De Wilde et al. (2014, BioProcess International) reports mixing times of 2–20 s across the 2 L to 2,000 L scale range and kLa values greater than 10 h−¹ readily achievable at all scales, with up to 40 h−¹ at 2,000 L in microsparger operation. Sartorius Generation 3 adds factory-integrated Repligen XCell ATF hollow-fibre cell retention as a supported option for intensified fed-batch and perfusion, plus the Biobrain automation platform that replaces the legacy BioPAT MFCS control tower.

When Biostat STR wins

Sartorius wins on installed CDMO base and tech-transfer predictability. Biostat STR is the reference platform at Samsung Biologics (~784,000 L of commercial capacity across five plants in Songdo), WuXi Biologics, Boehringer Ingelheim BioXcellence, and much of the Sartorius-adjacent European CDMO fleet, so a process transferred from a Biostat STR PD line lands on an identical geometry at commercial scale. If your programme is CDMO-manufactured for clinical or commercial supply, the transfer risk is lowest here. The Generation 3 XCell ATF integration also makes it the smoothest platform for teams whose fed-batch strategy specifically needs perfusion-based N-1 seed generation.

Thermo HyPerforma S.U.B. and DynaDrive in detail

Thermo Fisher's single-use bioreactor portfolio spans two related product families. The HyPerforma S.U.B. is the classic cylindrical stirred-tank single-use bioreactor, available at 50, 100, 250, 500, 1,000, and 2,000 L in both 5:1 and 2:1 turndown geometries. The HyPerforma DynaDrive is the next-generation platform introduced to overcome mixing and mass-transfer ceilings at commercial scale — it uses a cube-shaped vessel and a novel multi-impeller drive train, and extends the range to 3,000 L and 5,000 L, the largest single-use bioreactor commercially available. Both families use HyPerforma BioProcess Container (BPC) bags with reusable BioProcess Controllers.

How it works

The classic HyPerforma S.U.B. uses a pitched-blade impeller on a bottom-mounted magnetically coupled shaft, driven by an AC motor and jacketed for thermal control. Two turndown geometries are offered per size: the 5:1 model has a taller aspect ratio (H/D ~2) for higher kLa at commercial scale and is preferred for microbial or high-cell-density mammalian; the 2:1 model has a wider H/D ~1 for gentle mixing and lower shear, preferred for shear-sensitive cell lines. The HyPerforma 5:1 S.U.B. brochure quantifies performance at each scale. The DynaDrive S.U.B. departs from the cylindrical stirred-tank archetype entirely: a cube-shaped vessel houses multiple impellers on a drive train that delivers higher power input per unit volume (P/V) than a classic S.U.B. at the same tip speed, achieving shorter mixing times, higher kLa, and lower minimum working volume. Thermo publishes a 250 L minimum working volume in the 3,000 L and 5,000 L DynaDrive vessels — a turndown of 12–20:1 — which lets a single seed train span two more generations without an intermediate vessel handoff. Thermo's own economics claim a 25% production-cost reduction versus a matched classic S.U.B. seed train through fewer reactors, less consumables, and less labour.

When HyPerforma wins

Thermo wins whenever the programme's mass-balance demands push past what a 2,000 L single-use bioreactor can deliver. DynaDrive 3,000 L and 5,000 L are the only commercially available single-use bioreactors above 2,000 L; if you want single-use disposables at that scale (for facility flexibility, faster changeover, or lower cleaning validation burden) HyPerforma is currently the only option. DynaDrive is also the strongest choice for consolidating a long seed train — the 12–20:1 turndown lets one vessel serve two seed generations, which reduces the number of reactors on the plant floor. On the classic S.U.B. side, Thermo wins in fill-finish-adjacent bioprocess facilities that already run the Thermo Fisher (formerly Life Technologies, Millipore) stack, and in fermentation applications via the HyPerforma SUF (Single-Use Fermentor) variant that achieves kLa greater than 600 h−¹ for microbial culture. The February 2025 Thermo Fisher acquisition of Solventum's Purification and Filtration business further strengthens Thermo's single-use portfolio.

Cytiva Xcellerex XDR in detail

The Cytiva Xcellerex XDR single-use stirred-tank family originated with Xcellerex Inc., was acquired by GE Healthcare, and is now marketed by Cytiva (part of Danaher). The XDR line spans XDR-10, XDR-50, XDR-200, XDR-500, XDR-1,000, and XDR-2,000 for cell culture applications with a consistent 5:1 turndown across the range. In March 2025 Cytiva expanded the "X-platform" branding to formally include the refreshed XDR-500 and XDR-2000 with tighter integration to the Cytiva ReadyToProcess X-station continuous downstream infrastructure — the Xcellerex XDR is now the upstream anchor for Cytiva's end-to-end continuous manufacturing story.

How it works

The Xcellerex XDR uses a distinctive off-centred, bottom-mounted impeller with four pitched blades on a magnetically coupled shaft driven from below. The off-centre placement provides asymmetric flow that avoids the central vortex of a conventional centre-line stirred tank and improves gas dispersion at low agitation rates. Sparging is via two families of interchangeable elements: microsparger with 2 μm or 20 μm nominal pore size for high-kLa oxygen delivery, and drilled-hole macrosparger with 0.5 mm or 1.0 mm holes for CO₂ stripping and low-shear operation. Sensor integration is via standard 12 mm and 25 mm PG13.5 ports that accept Hamilton VisiFerm and PreSens optical DO/pH, biocapacitance probes, and Raman spectroscopy flow cells. Published engineering characterisation by Kreitmayer et al. (2022, Bioengineering) for the XDR-10 reports mixing times below 30 s across all tested conditions and kLa up to 22.1 h−¹, confirming "hydrodynamic conditions well suited for the cultivation of animal cells despite the unusual design of a single bottom-mounted impeller and an unbaffled cultivation bioreactor." An optional perfusion-specific biocontainer loading door is available for the 1,000 L and 2,000 L systems to accommodate external ATF or TFF cell retention devices, and the 1,000 L and 2,000 L systems ship with a semi-automatic hoist that simplifies biocontainer installation. Control uses Cytiva's DeltaV configuration or an Allen-Bradley PLC/PAC with AVEVA HMI on the XDR-2000.

When Xcellerex wins

Cytiva wins when the downstream train is Cytiva. Xcellerex XDR pairs natively with the Cytiva ReadyToProcess single-use downstream stack (MabSelect PrismA Protein A capture, ReadyMate connectors, KTA ready single-use chromatography skids), so a facility that has standardised on Cytiva's end-to-end continuous manufacturing story gets the tightest hardware and software integration by staying inside the ecosystem. Xcellerex also wins on turndown — the 5:1 turndown is standard across the full range without a separate 2:1 SKU, so seed-train planning is simpler. The optional perfusion loading door on the XDR-1000 and XDR-2000 is a purpose-built engineering feature for high-density perfusion campaigns that other vendors bolt on externally.

Pros and cons

Sartorius Biostat STR

Thermo HyPerforma S.U.B. and DynaDrive

Cytiva Xcellerex XDR

Which vendor should you choose?

Pick based on the dominant constraint: CDMO tech-transfer risk, scale ceiling, downstream integration, or perfusion architecture.

Real-world use cases

How process teams typically converge on one vendor for a specific problem.

Cost and lifecycle considerations

All three vendors price their 2,000 L systems in the USD 0.6–1.2 million range for a fully instrumented line (vessel holder, control tower, DO/pH/temperature/pressure sensors, master station). Sartorius and Cytiva typically land at the higher end when bundled with their proprietary sensor and automation ecosystems (BioPAT, DeltaV); Thermo's classic HyPerforma S.U.B. is often the lowest-capex option, though DynaDrive at 5,000 L is a separate capital tier.

Bag consumables are the recurring cost. A 2,000 L Flexsafe STR, HyPerforma BioProcess Container, or Xcellerex biocontainer runs USD 4,000–8,000 per batch depending on sensor and impeller configuration. At 30 batches per year over 3 years that is USD 360,000–720,000 in bag spend alone per line. Reusable optical DO/pH sensors (Hamilton VisiFerm, PreSens) amortise across ~50–100 batches; single-use sensor patches for optical DO/pH add roughly USD 100–300 per batch.

Labour and QC cost tracks batch count and staffing model. Assume USD 500,000–1,000,000 over 3 years per 2,000 L line for shift operators, QA release testing, and environmental monitoring. For a full 3-year, 30-batch/year 2,000 L line the total cost of ownership sits at roughly USD 2.0–3.7 million. The crossover point where stainless-steel becomes cheaper is 2,000–5,000 L working volume with 30+ batches per year — see the dedicated single-use vs stainless-steel cost comparison and the Fermentation Economics Calculator for the model.

Vendor landscape

Beyond the big three, the single-use stirred-tank market includes several credible alternative and complementary vendors. Sartorius, Thermo Fisher, and Cytiva together hold just over 45% of 2024 revenue; the remainder is fragmented.

Sartorius platform

• Biostat STR Generation 3: 50, 200, 500, 1,000, 2,000 L; the reference workhorse for mammalian cell culture across the largest CDMO fleet.
• Biostat STR Microbial: microbial fermentation variant with elevated kLa and higher heat-removal capacity for E. coli and Pichia expression.
• Sartorius ambr 250 / ambr 15: automated micro-bioreactor systems for PD and cell-line screening that share Sartorius scale-up mathematics with the Biostat STR.

Thermo Fisher platform

• HyPerforma S.U.B.: 50–2,000 L classic cylindrical single-use bioreactor with 2:1 and 5:1 turndown BPC bags.
• HyPerforma DynaDrive: 50, 500, 3,000, 5,000 L cube-shaped multi-impeller platform — the only 5,000 L single-use bioreactor commercially available.
• HyPerforma SUF (Single-Use Fermentor): microbial fermentation variant with kLa exceeding 600 h−¹.

Cytiva platform

• Xcellerex XDR: XDR-10 through XDR-2000 with consistent 5:1 turndown and off-centred bottom impeller; refreshed X-platform SKUs at 500 L and 2,000 L (March 2025).
• ReadyToProcess WAVE 25: rocking-motion single-use bioreactor to 25 L for seed train and small-scale cell therapy.
• iCELLis fixed-bed: fixed-bed single-use bioreactor to 500 m² surface area for adherent cell culture, particularly viral vector.

Alternative vendors (the remaining ~55% of the market)

• Merck Millipore Mobius: 3 L to 2,000 L single-use bioreactor family with integrated MyControl software.
• ABEC Custom Single Run (CSR): the largest single-use bioreactors on the market (up to 6,000 L custom); typically deployed for high-titer mAb and vaccine campaigns.
• Getinge/Applikon AppliFlex STR: 40–1,000 L single-use bioreactor with the AppliFlex direct-drive design (formerly Applikon).
• Eppendorf BioBLU: single-use bioreactor vessels from 0.3 L to 40 L, popular in PD labs and academic settings.
• PBS Biotech PBS single-use: vertical-wheel single-use bioreactors from 3 L to 2,000 L targeting cell therapy and viral vector.

Related calculators and tools

Related articles

Resources and references

• De Wilde et al. (2014). Superior scalability of single-use bioreactors. BioProcess International. — peer-reviewed characterisation of Biostat STR mixing time (2–20 s from 2 L to 2,000 L) and kLa (up to 40 h−¹ at 2,000 L with microsparger).
• Kreitmayer D et al. (2022). CFD-Based and Experimental Hydrodynamic Characterization of the Single-Use Bioreactor Xcellerex XDR-10. Bioengineering (Basel) 9(1):22. — peer-reviewed hydrodynamic and mass-transfer characterisation of Xcellerex XDR-10 confirming mixing <30 s and kLa up to 22.1 h−¹.
• HyPerforma 5:1 Single-Use Bioreactor Family Brochure (Thermo Fisher Scientific). — vendor datasheet covering the 50–2,000 L classic S.U.B. family including impeller design, sparger options, and turndown geometries.
• Mordor Intelligence. Single-use Bioreactor Market Size, Growth, Share & Report Analysis. — industry market-share and CAGR data underlying the 2024 USD 4.58 billion market value and vendor share estimates.