title: Propane jet-freezing: a valid ultra-rapid freezing method for the preservation of temperature dependent lipid phases.
abstract: We have developed a temperature controlled specimen stage on the existing jet-freezing apparatus, in order to quench samples from elevated temperatures up to 330 K. We have shown that the phase transition both from the liquid-crystalline to solid phase for pure phosphatidylcholines and from hexagonal II to lamellar phase for phosphatidylethanolamine/4% egg phosphatidic acid is prevented. Moreover, cooling rates exceeding 10,000 K s-1 were recorded indicative of ultra-rapid freezing capacity. Cryoprotectants can be omitted, since phase separation due to ice crystal growth does not occur.
mesh_terms: D003460:Crystallization; D005614:Freeze Fracturing / Q000295:instrumentation / Q000379:methods*; D005615:Freezing; D007053:Ice; D008722:Methods; D010713:Phosphatidylcholines; D011407:Propane
chemical_list: D007053:Ice; D010713:Phosphatidylcholines; D011407:Propane