I've had good luck cryoprotecting high salt crystal conditions with sodium 
malonate (2.0-2.5M).  Start with a 5M sodium malonate solution and dilute to 
40-50% with mother liquor.
good luck,
Rob
________________________________________
From: CCP4 bulletin board [[email protected]] On Behalf Of Jerry McCully 
[[email protected]]
Sent: Wednesday, December 15, 2010 1:13 PM
To: [email protected]
Subject: [ccp4bb] cryoprotectant for protein crystal grown from Di-sodium 
hydrogen phosphate

Dear All;

      Recently we got some crystals from the condition #51 in the SaltRx 
crystallization kit from Hampton research.

       It contains 1.5M Na2HPO4 and 0.1M Tris(pH8.5). We am going to do a test 
diffraction ASAP.

      What cryoprotectant did you use for this condition?

      Thanks a lot and have a nice holiday season!


Jinghua

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