Pierce™ Polyacrylamide Desalting Columns, 1.8K MWCO, 5 mL

You may remove excess solvent and smaller moieties by centrifugation through a microconcentrator. This will concentrate your protein sample.

(1) Choose microconcentrator tube (available from a variety of commercial suppliers) with a protein cutoff smaller than the molecular weight of the protein in the sample. Check our Pierce Protein Concentrators PES.

(2) Add 1 µL of 20% w/v SDS to a dry microconcentrator tube (if sample does not already contain SDS).

(3) Slowly add sample (a few microliters at a time) to membrane until membrane is completely wet. Centrifuge to near (but not complete) dryness.

(4) If intention is to desalt sample or buffer exchange: Add ~50 µL water to microconcentrator and spin until nearly dry. Repeat buffer exchange. Sample will remain on membrane. Check our Zeba desalting proteins.

(5) Using a new collection tube, invert membrane and spin at low speed (1000 x g) to elute protein from membrane. Add 2X SDS-Sample Buffer containing 10 mM DTT to membrane: vortex, invert and spin. Final volume should be ~20 µL.

Find additional tips, troubleshooting help, and resources within our Protein Dialysis, Desalting, and Concentration Support Center.

No, the resin within these Desalting Columns is not meant to be centrifuged, they are only suitable for gravity-flow.

Find additional tips, troubleshooting help, and resources within our Protein Dialysis, Desalting, and Concentration Support Center.

The best way for removing unreacted SATA (Cat. No 26102) would be HPLC. Another possibility would be to use desalting columns. In case the peptide is bigger than 1.8 kDa, you would like to use the Pierce Polyacrylamide Desalting Columns, 1.8K MWCO, 5 mL (Cat. No 43426).

Find additional tips, troubleshooting help, and resources within our Protein Dialysis, Desalting, and Concentration Support Center.