The most useful storage advice starts with the record supplied for your material. Keep dry-material conditions, prepared-solution conditions and transport conditions as separate fields.
Why one storage rule does not fit every peptide
Thermo Fisher's standard-peptide instructions link individual peptide properties to solubility, identify oxidation and light sensitivity as relevant considerations, and advise avoiding repeated freezing and thawing of solutions. Those instructions describe a supplier's material category. They do not validate a universal shelf life for all peptides, solvents or formulations.
Separate these three records
| State | Information to retain |
|---|---|
| Unopened dry material | Batch identity, receipt date, documented temperature range, expiry or retest information |
| Prepared solution | Solvent, concentration, preparation method, aliquot labels, documented conditions and supported use period |
| Transport or excursion | Duration, observed conditions, packaging, any logger data and the assessment requested |
A practical storage log
Record the material and batch, storage location, date placed into storage, operator, applicable instruction version, and any access or temperature event relevant to the method. For aliquots, link the identifier to the original preparation record so an experiment can be traced back to the same sample history.
What if a parcel arrived warm?
A parcel's surface temperature at arrival is not a complete transport history. Record what was observed and request an assessment against the material's supported transport conditions. Do not infer either full stability or complete degradation without the relevant evidence. Our shipping page describes the published dispatch process; contact us with the batch and delivery details for a specific enquiry.
What if a solution changes appearance?
Document the change and investigate it against the method. A clear appearance does not establish chemical stability, and a visible change does not identify the mechanism by itself. Keep observations separate from an analytical conclusion.
Use the preparation-record guide before making a solution, and the supplier worksheet to request missing storage or stability information.