Soluble possibilities include glucose, ethylene glycol, DMSO, glycerol (15-30%). You may not need much cryoprotectant at all at these salt concentrations. PEGs are not very soluble in high ammonium sulfate solutions. (I think PEG-400 can go up to only 4% or so at 2 M ammonium sulfate.)

Cheers.


Schulman, Brenda wrote:
Hello!

I would be grateful for suggestions on cryoprotectants for crystals growing
in > 3M ammonium sulfate.

Thanks!

Brenda


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