VMF clarification of E. coli & lysates

Vibro^® Membrane Filtration (VMF) performs better than conventional TFF technologies for the clarification of high‑density E. coli cultures and lysates expressing diverse recombinant proteins.

This study shows that VMF is a robust, high‑performance solution for demanding midstream bioprocessing applications, particularly in high‑density microbial processes where conventional filtration approaches face performance or scalability limitations. VMF offers a compelling combination of:

• high protein recovery
• high solids handling
• low fouling
• robust operation

Superior Target Protein Recovery Across Diverse Molecules

VMF consistently delivered higher or equal target protein recovery compared with traditional TFF modalities at equivalent membrane loading. Notably, for challenging protein types—such as basic monomers in high‑salt conditions and large acidic oligomers—VMF achieved the highest overall recoveries (up to ~77%), significantly outperforming hollow fiber filtration under comparable conditions. This demonstrates VMF’s versatility across proteins with different sizes, charges, and biochemical behaviors.

High Solids Loading with Low Fouling Risk

The study showed that VMF handled high cell wet weight and lysate solids loading equivalent to hollow fiber systems, while maintaining stable flux and avoiding premature membrane fouling. In contrast, flat‑sheet cassettes required substantially lower loading to operate successfully. VMF’s vibrating membrane mechanism effectively mitigates surface polarization and fouling, enabling consistent performance with dense, viscous process streams.

Low Operating Pressure and Enhanced Process Robustness

VMF operated at significantly lower feed pressures than hollow fiber and cassette-based systems during both cell wash and lysate clarification. Lower pressure operation reduces mechanical stress, enhances process robustness, and supports gentle handling of sensitive biomolecules—an important advantage for high‑value biopharmaceutical applications.

Efficient Clarification and Impurity Reduction

The study demonstrated that VMF effectively achieved:

• >4‑log reduction in endotoxin levels
• Near‑complete removal of particulate matter (turbidity reduced to ≤1 NTU)
• Substantial clearance of host cell proteins and other impurities

These results confirm VMF’s strong clarification efficiency while preserving target protein yield, multi-stage configurations and paving the way for DSP intensification.

Operational Simplicity and Automation

VMF was shown to be fully compatible with automated TFF operation, enabling unattended or overnight processing with minimal supervision. Stable flux control, reduced fouling, and predictable processing times contribute to ease of use during process development and scale‑up.

Cost‑Effective & Scalable

When membrane cost was evaluated relative to achievable solids loading, VMF emerged as the most economical option among the technologies tested due to higher effective throughput and reduced membrane surface area requirements.

VMF’s low‑pressure operation and mechanical vibration approach furthermore position it as a strong candidate for linear scale‑up in high‑density microbial bioprocessing.