Insect supernatant inducing color change in Talon resin?

vladimir vigdorovich vladv at
Thu Feb 22 03:06:26 EST 2001

Hi, I am trying to optimize a purification procedure of a His-tagged
protein derived from Hi5 cells using Talon resin. When I apply clarified,
pH-adjusted (to ~8.0), buffered (supplemented with 20 mM Tris-HCl) supe to
the column, it slowly changes color to whitish-pink and the flowthrough
darkens. Some protein binds but I suspect that much ends up in
Can anyone verify my suspicions that Co2+ is being leeched and/or suggest
a remedy?

vladv at

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