[ccp4bb] Question about cryoprotectant

[yang li]

Hi,
l have a crystal grow at condition screen l 40:
0.1M tri-sodium citrate dihydrate  pH5.6  isoproponal 20%PEG4k 20%
and the crystal need a cryoprotectant, we have used the 30% glycerol but it
is not good, the mosaicity of
the diffraction pattern is a little high, so anyone knows which is the best
cryoprotectant for this crystal?
Thanks!