Lyophilized peptides should be stored at -20℃, away from bright light. Most lyophilized peptides are stable for several years under these conditions. However some special amino acids exsit in sequence curtail the storage time. It should adopt special storage methods. For example, Peptide sequences containing C, M, or W are prone to air oxidation. It is recommended to purge the air out of the vial and replace it with a blanket of nitrogen or argon.

peptide solutions are stable for up to a week at 4°C. it is very limted shelf life. especially for sequences containing cysteine, methionine, tryptophan, asparginine, glutamine, and N-terminal glutamic acid. To prolong the storage life of peptides in solution, sterile buffers with a pH of around 5-6 should be used. Aliquots should be stored at -20°C or colder wherever possible.

In general:

•  Repeated freeze-thaw cycles should be avoided for both lyophilized catalog peptides and peptide solutions.
• The peptide-containing vial should be tightly capped at all times.
• It is also recommended that the peptide be dissolved to the highest possible concentration, and then diluted with water or buffer to the working concentration.