Dear Chris, I recall from many years ago that we had a screening hit in high isopropanol, which started boiling violently when we opened the well. We "solved" the problem by using another precipitant but I would also be interested in tricks how to handle high isopropanol. Best regards, Herman
________________________________ From: CCP4 bulletin board [mailto:ccp...@jiscmail.ac.uk] On Behalf Of Chris Meier Sent: Friday, April 09, 2010 10:39 AM To: CCP4BB@JISCMAIL.AC.UK Subject: [ccp4bb] freezing crystals grown in isopropanol condition Dear all, I have a protein which crystallizes in 25% isopropanol, at pH4.5. Does anyone have experience freezing crystals grown in such a condition? What cryoprotectants should I try? Can isopropanol itself act as a cryoprotectant? Any suggestions on how to deal with isopropanol evaporation during mounting? Many thanks and best wishes, Chris