Peptide Storage and Handling Guidelines

The peptide-containing vial should be tightly capped at all times. The experiment should be carefully planned to minimize opening of the lyophilized peptide vial.

Short Term Storage(<3 months): Short term storage of lyophilized peptide should be done in a freezer at -20°C.
Long Term Storage: We recommend storing the peptide in a deep freezer at -80°C if available.

Repeated freeze-thaw cycles should be avoided for both lyophilized peptides and peptide solutions. If custom peptide samples need to be frequently or periodically taken from the stock, it is recommended to make a series of aliquots from the stock. Synthetic 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. In general, peptide solutions are stable for up to a week at 4°C. However, if the synthetic peptide sequence has inherent instability (for example: containing C,M,W or D-G-,-D-P- structure), it might be better to freeze the solution when not in use. Peptide solutions at pH>8 should also be frozen when not in use.
It is better to use the peptide which contents unstable structure as soon as possible.

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