Immobilized Copper, Cobalt and Zinc Chelating Resins are also available. Cobalt has the highest selectivity followed by Zinc, Nickel then Copper, but has the lowest binding capacity. Copper has the highest binding capacity, followed by Nickel then Zinc.
www.gbiosciences.com/NickelChelatingResin-desc.aspx
www.mail-archive.com/ccp4bb@jiscmail.ac.uk/msg04172.html
Copper binds
the 6xHis tag more tightly than nickel, whereas zinc and cobalt have a lower affinity
for the 6xHis tag.
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