Glucose-based Molecules Help Preserve Frozen Blood Better th
Stored blood is usually kept just above the freezing point, allowing it to be ready for use for up to six weeks after it was donated. This six week limitation is one of the reasons for constant blood drives, that are accompanied by cookies and apple juice. Storing blood for longer periods means you have to actually freeze it, but freezing damages cellular structures unless a protective substance such as glycerol, an ice recrystallization inhibitor, is used. The problem with glycerol is that it has to be separated from donor blood before a transfusion, a process that can take about an hour, which is often too long for emergency situations...

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