High-Performance 5kDa PES Ultrafiltration Cassette Achieves >95% Protein Recovery in TFF Process

Optimizing Protein Concentration with 5kDa PES Ultrafiltration Cassettes

In biopharmaceutical and protein purification workflows, achieving high recovery rates, stable flux, and reliable membrane integrity is critical for process efficiency. Recently, a performance evaluation was conducted using a 5kDa PES ultrafiltration cassette with a membrane area of 0.11m² to process protein feed solutions through a Tangential Flow Filtration (TFF) system.

The experimental results demonstrated excellent concentration efficiency, stable transmembrane pressure (TMP), and outstanding target protein recovery, highlighting the advantages of PES ultrafiltration membranes in laboratory-scale and pilot-scale applications.

 

Product Information

Membrane Type: 5kDa PES Ultrafiltration Cassette

Effective Membrane Area: 0.11m²

Model: N2PE2405GA02

The 5kDa PES membrane cassette is designed for protein concentration, diafiltration, and biomolecule purification applications requiring high retention performance and chemical compatibility.

 

Experimental Results

The TFF experiment processed 800mL feed solution using the 5kDa PES ultrafiltration cassette, achieving a concentration factor of 5–10×.

Key Performance Data

Parameter	Result
Feed Volume	800mL
Concentrate Volume	63.4mL
Flush Volume	60mL
Total Concentrated Product	123.4mL
Total Permeate Volume	726.5mL
Average Flux	17.2 LMH
Total Filtration Time	23 min
TMP	0.55 bar

During the entire filtration process, the transmembrane pressure remained stable at 0.55 bar, ensuring smooth operation and minimizing membrane fouling.

The experiment further confirmed that the 5kDa PES ultrafiltration cassette can maintain stable filtration performance while delivering efficient protein concentration.

 

Excellent Protein Recovery Performance

SDS-PAGE analysis showed that the target protein recovery exceeded 95% after ultrafiltration concentration.

This result demonstrates that the PES ultrafiltration membrane provides excellent retention capability for sensitive biomolecules while minimizing product loss during TFF processing.

Key benefits include:

High protein recovery

Stable membrane flux

Low TMP operation

Efficient concentration performance

Reliable membrane integrity

These characteristics make the cassette highly suitable for:

Recombinant protein purification

Antibody concentration

Enzyme concentration

Vaccine downstream processing

Biopharmaceutical ultrafiltration applications

 

Water Flux Recovery and Membrane Integrity

After use, the membrane cassette underwent cleaning and regeneration procedures to evaluate long-term reusability.

Water Flux Recovery Results

Condition | Flux (LMH) | Flux Recovery |
| Before Use | 47.5 LMH | 92% |
| After Cleaning | 43.6 LMH | - |

The membrane maintained excellent permeability after cleaning, indicating strong chemical resistance and reusable performance.

Integrity testing using the pressure-hold method confirmed that the 5kDa PES ultrafiltration cassette remained fully intact before and after the experiment.

 

Tangential Flow Filtration Process Conditions

The filtration experiment was performed under stable operating conditions:

Time	Feed Flow Rate	Feed Pressure	Retentate Pressure	TMP	Permeate Flow
0 min	295 mL/min	0.6 bar	0.5 bar	0.55 bar	32 mL/min
9 min	295 mL/min	0.6 bar	0.5 bar	0.55 bar	35 mL/min
17 min	295 mL/min	0.6 bar	0.5 bar	0.55 bar	29 mL/min
22 min	295 mL/min	0.6 bar	0.5 bar	0.55 bar	33 mL/min

The consistent process data highlights the stability of the Tangential Flow Filtration system and the reliable performance of the PES ultrafiltration membrane cassette.

 

Cleaning and Storage Procedure

To ensure optimal membrane lifetime and performance, the cassette was cleaned using:

Purified water flushing

0.5M NaOH alkaline cleaning

Final storage in 0.1M NaOH solution at room temperature

The cleaning procedure effectively restored membrane flux while maintaining membrane integrity.

 

Advantages of 5kDa PES Ultrafiltration Cassettes

The experimental results demonstrate several advantages of using 5kDa PES ultrafiltration cassettes in TFF applications:

High target protein retention (>95%)

Stable low-pressure operation

Fast concentration efficiency

Excellent flux recovery after cleaning

Strong membrane durability

Suitable for repeated use

As an important component in Tangential Flow Filtration systems, PES ultrafiltration cassettes are widely used in biopharmaceutical manufacturing, laboratory research, and downstream purification processes.

 

Conclusion

This study confirms that the 5kDa PES ultrafiltration cassette delivers outstanding performance in protein concentration and purification workflows. With high recovery rates, stable flux, and excellent membrane integrity, it is an ideal solution for modern TFF ultrafiltration applications.

For laboratories and bioprocess manufacturers seeking reliable PES ultrafiltration membrane technology, the 5kDa cassette provides an efficient and scalable solution for protein purification and concentration processes.