METHOD AND APPARATUS FOR CRYOPRESERVATION

摘要

A method of cryopreserving biological material, which method comprises providing a sample of the biological material, where a liquid phase of the sample includes at least one solute; lowering the temperature of the sample to a nucleating point at which ice nucleation can occur in the sample; effecting ice nucleation in the sample; and lowering the sample temperature from the nucleating point to the solidification point thereof, characterised in that the temparature lowering from the nucleating point to the solidification point is non linear, whereby the rate of change of solute concentration in the liquid phase decreases for more than 80 % of the time taken to lower the temperature from the nucleating point to the solidification point.