Proper Storage Procedures

On arrival, confirm the package is cold, the seal is intact, and the vial label batch code matches the dispatch note. Photograph anything anomalous before opening.

Record: compound, batch code, supplier, receipt date, vial mass, storage location, opened date once reconstituted. Tie the entry to its COA PDF in your LIMS or shared drive.

FIFO. Use older lyophilised stock first within its stability window, and reconstitute only as needed.

A storage procedure becomes auditable when three records exist: what arrived (batch number, certificate reference, arrival condition), where it is (location tag — freezer, shelf, rack), and what happened to it (opening dates, aliquot events, disposals). None of this needs laboratory software; a bound notebook or a simple spreadsheet satisfies it.

The value shows up at the moments you can't predict: an audit query months later, a collaborator inheriting the project, or an anomalous result that needs tracing back to a specific vial and its handling history. Labs that keep the three records resolve those moments in minutes; labs that don't re-derive them from memory, badly.

Communal cold storage introduces failure modes that individual bench fridges don't: doors opened dozens of times per hour (temperature cycling), unlabelled containers from other users, and frost accumulation that buries small vials. The mitigations are cheap — a sealed secondary container for peptide vials, batch-and-date labelling on the outside, and a designated shelf rather than free placement.

One habit prevents most shared-storage incidents: never store reconstituted material in the same container as powder. Cross-contamination from a leaking solution is the classic way a carefully verified batch becomes unusable, and it is entirely preventable with two separate, clearly labelled containers.