Why Samples Should Not Be Plunged Straight into Liquid Nitrogen？
Editor:adminClick：
Time:2026-10-22 09:08
Cryopreservation is often reduced to a simple rule: the lower the temperature and the faster the cooling, the better. In practice it is not so. What determines whether a sample survives is frequently not the final temperature but the way it gets there.
Water is the problem. Cells contain a great deal of it, and below freezing it solidifies, expands and forms angular ice crystals. These crystals can puncture membranes and organelles, causing mechanical damage that is difficult to reverse. At the same time, water outside the cell freezes first, raising the solute concentration of the remaining solution; osmotic pressure then draws water out of the cell, which shrivels and dehydrates. Ice-crystal injury and this "solution effect" are the two principal sources of damage during freezing.
Two technical paths follow. The first is controlled-rate cooling: the temperature is lowered gradually so that water leaves the cell in an orderly fashion and intracellular ice is minimised, with cryoprotectants such as dimethyl sulfoxide or glycerol used to depress the freezing point and moderate solute concentration. The second is vitrification: a very high cooling rate combined with a higher concentration of protectant, so that water has no time to arrange itself into crystals and instead becomes an amorphous glassy state, sidestepping ice altogether. The two approaches differ considerably in their requirements for cooling rate and reagent formulation.
The relevance to a liquid nitrogen tank is a division of labour: the tank handles storage, while the cooling process handles entry. Dropping a sample straight into liquid nitrogen abandons rate control altogether. In practice, cooling is completed in a controlled-rate freezer before transfer to the tank, or the vapour zone is used as an intermediate step, with racks and boxes pre-cooled to lessen thermal shock. Thawing matters just as much, and rapid rewarming is generally recommended to avoid recrystallisation during warming.
The outcome of cryopreservation is often decided before the sample ever reaches the tank.
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