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Dear All,

This question sounds simple but I dont know the answer.

I was preparing a 24 well crystal screen. When I try to use 10 mM  ZnSO4 with HEPES (pH 7.6) buffer it precipitates. I tried both ZnCl2 and Zn acetate the effect is same.  

I dont know why this Zn in not compatible with HEPES.

Could you please tell me why is this?

I appreciate your help.

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All Things Serve the Beam
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                               David J. Schuller
                               modern man in a post-modern world
                               MacCHESS, Cornell University
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