Your mother liquor is already very close to being a cryoprotectant. I
think adding 5% ethylene glycol, glycerol, etc. is enough. Too much
may damage your crystals. In addition, you can also try:
1. Grow new crystals in your current crystallization condition + 5%
cryoprotectant.
2. Increase the PEG in your reservoir to 40% and allow vapor diffusion
to gently dehydrate your crystals to allow direct freezing.
ho
UC Berkeley
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