Polypeptides are generally preserved in the form of freeze-dried powder, it is stable in -20℃, especially after freeze-dried and stored in the dryer. Most peptides can be stored at this temperature for several years unchangeably. If you use a small amount of peptides at a time, it's easier to pack them in small packages. To reduce the effect of humidity, the lyophilization peptides should be restored to room temperature in dry conditions before exposure to air. When the drying is not available, the best method is to store it in a small sample and use it as soon as possible. For the polypeptides which containing Met, Cys or Trp peptides, deoxidize buffer agent is necessary for the protection, because this kind of peptide is more likely to be oxidized by air. A better solution is to slowly replenish the nitrogen or argon gas before sealing so as to reduce the oxidation. The Polypeptides that contain Gln or Asn are also easy to degrade, so the retention period is shorter than other peptides that do not contain such amino acids.
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