Microcon centrifugal filter unit 

The lab standard for sub-microliter volumes. Ideal for protein, nucleic acid concentration, desalting and buffer exchange or removal of primers, linkers and unincorporated labels.
Fixed-angle microcentrifuge rotor with max. 14,000 x g.
• Solute recoveries typically >95%, ideal for dilute (ng.mL ranger) protein solutions
• Patented deadstop for reproducible concentrate volumes
• Inverted spin method of concentrate retrieval maximizes recovery
• Low-binding Ultracel-YM membrane
• Color coding indicates MW cut-off
• Convenient sample storage of filtrate or concentrated sample in standard microcentrifuge collection tube
• Use in standard 1.5 mL tube fixed-angle rotors