Best Ultrafiltration Lab Filters AI pick
Chosen by an AI model from its trained knowledge, with its reasoning.
AI pick (line): MilliporeSigma Amicon Ultra centrifugal filters
Amicon Ultra is the most widely used centrifugal ultrafiltration device for concentrating and buffer-exchanging proteins and nucleic acids, across many MWCOs and volumes.
Not for: Large-volume processing beyond centrifuge-tube scale, which needs stirred cells or tangential flow.
AI picks by need
For Alternative centrifugal concentrator
Sartorius Vivaspin (line)
A well-established centrifugal concentrator with PES membrane options.
Not for: Protocols written specifically around Amicon devices.
For Microvolume samples
Pall Nanosep (line)
Small-format centrifugal devices for sub-milliliter samples in a microcentrifuge.
Not for: Larger-volume concentration.
What the AI looks for in Ultrafiltration Lab Filters
- MWCO selection
- Choose a MWCO roughly one-third to one-half the molecular weight of the molecule you want to retain A MWCO too close to the molecule's size lets it pass through, and recovery drops.
- Device volume
- Match device capacity to the starting volume and your rotor (microcentrifuge vs 15 mL or 50 mL tubes) Overfilling or using the wrong rotor wastes time and can break the device.
- Membrane chemistry
- Regenerated cellulose for low binding and high recovery; PES for speed Membrane binding affects recovery of dilute proteins.
- Spin limits
- Do not exceed the manufacturer's maximum g-force, and don't spin to dryness Spinning to dryness or too hard causes protein loss and membrane failure.
Brands that matter
- MilliporeSigma: Amicon Ultra centrifugal devices and stirred cells.
- Sartorius: Vivaspin concentrators.
- Pall: Nanosep, Microsep and Macrosep devices.
- Thermo Scientific: Pierce protein concentrators.
What to avoid
- Choosing MWCO equal to the protein's molecular weight
- Skipping the pre-rinse when glycerol traces from the membrane matter downstream
Questions
Is MWCO an exact cutoff?
No. It is a nominal rating, and molecular shape and buffer affect retention, so leave margin below your molecule's size.