Hi to all,I dissolved calcitriol with ethanol and since calcitriol is cholesterol derivative it is important the remove any dissolved oxygen in the ethanol to maintain stability. I watched several videos and done several attempts with ethanol to optimize the time, pressure, etc...But unfortunately, ethanol evaporated on every attemp. Someone suggested to apply 5030C PURGE-AND-TRAP method but I d'ont think I have the equipment. Any suggestions? Thanks.