Reproducibility problems often trace back to small, undocumented handling differences: a vial left on the bench, a different storage freezer, a lot that changed mid-study. A simple, consistent record removes most of that ambiguity.
What to record on receipt
- Supplier, product name, lot number and quantity.
- Date received and condition of the packaging.
- A copy of the certificate of analysis, filed against the lot number.
- Where the vial was stored and at what temperature.
What to record during use
- The date and time each vial is opened.
- How long material spent outside cold storage.
- The diluent used, its lot number and the date it was first opened.
- Who handled the material and where.
Keep lots separate
Changing lots in the middle of a study can introduce a variable you did not intend. If you must switch, note exactly when, and keep the analysis reports for both lots on file.
Plan for the unexpected
If a result looks odd, a good record lets you check the obvious explanations quickly: was the vial stored correctly, was it warmed and refrozen, did the lot change. Without a record, you are left guessing.
Start with storage
Most handling problems begin with storage. Our guide to storing lyophilized research peptides covers temperature, moisture and freeze-thaw cycles, and our guide to reading a certificate of analysis explains what to file with each lot.
For laboratory research use only. Not for human or veterinary use. This article is general educational information for researchers and is not medical advice.