Cobalt Agarose Beads (High Density)

Available in bulk or in prepacked columns, cobalt has a binding capacity of >25 mg/ml with approximately 60 kDa protein. Cobalt binds fewer host protein contaminants, resulting in lower background than nickel resins and no metal contamination in eluted histidine-tagged protein sample. In addition, it allows for purification of proteins under native or denaturing conditions. Cobalt Agarose works very well with Ni/Cu/Co Resin Wash Buffer and Histidine Protein Elution Buffer.IDA cross-linked Agarose resin consists of iminodiacetic acid groups ligated by stable ether linkages via a spacer arm. IDA is a tridentate chelating agent, covalently coupled to cross-linked agarose beads. This resin is loaded with Co2+. The resulting, ready-to-use resin is ideal for rapid purifications of His-tagged proteins.Affinity chromatography is based on the interaction between certain superficial protein residues (histidines, cysteines and to a lesser extent tryptophans), with transition metal cations, forming chelates.Cobalt agarose resin is suitable for use with FPLC, but with pressuresno more than 20 kPa. Too much pressure or too fast of a flow rate will result in diminished performance.