Prior to opening the package containing the peptide, it is best to equilibrate the material to room temperature in a desiccator. Failure to warm the peptides can cause condensation to form on the product upon opening the bottle, reducing stability.
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Tip: How to weigh peptides
When weighing out a quantity of peptide, warm the package as noted above and perform the measurement as quickly as possible. Store all unused peptide at -20°C or less. Sequences containing cysteine, methionine, tryptophan, asparagine, glutamine, or N-terminal glutamic acid will have shorter shelf lives than other peptides.
Tip: Peptide storage guidelines
Lyophilized peptides should be stored in a sealed container with desiccant at -80°C (at least -20°C) in order to minimize peptide degradation. The peptide can be stored for several years under these conditions, which also prevent bacterial degradation, secondary structure formation, and oxidation.