Ni2+ ions give nickel agarose beads their characteristic blue color. This blue color can fade or disappear completely when loading his-tagged proteins onto the column....
How to Strip, Clean, and Recharge Nickel Agarose Beads
Like other resins, preparing nickel agarose beads for reuse involves cleaning with solutions that contain high salt, basic pH, or organic solvents. However, these beads...