A short technical note on storage and handling of lyophilized reference standards

Lyophilized peptide reference standards are stable under recommended storage conditions. This note summarizes the storage and handling guidance documented in the Certificate of Analysis that accompanies every lot.

**Storage temperature.** Lyophilized reference standards are stable at 2–8°C for 24 months from the date of manufacture documented on the Certificate of Analysis. Long-term storage below –20°C is acceptable and may extend the documented stability window. Storage above 25°C accelerates degradation and is not recommended.

**Handling.** Vials should be equilibrated to room temperature before opening to minimize condensation. resuspension, when performed, should be done under aseptic conditions using a qualified diluent appropriate to the downstream assay. The Certificate of Analysis does not specify a diluent; the appropriate diluent is determined by the assay protocol.

**Chain of custody.** Each vial carries a lot identifier printed on the label. The buyer should record the lot identifier in their research records, along with the date of receipt, the storage temperature log, and the date of any subsequent handling. Chain-of-custody records are the buyer's responsibility and are not maintained by Coastal Vanguard LLC after delivery.

**Lot archive.** The Certificate of Analysis for every lot is archived for the lifetime of the lot. Researchers can request the archived CoA at any time by contacting the research desk with the lot identifier.

**All references in this note refer to laboratory research and in-vitro investigation. The information in this note is not medical advice and is not a recommendation for the administration of any product to humans or animals.**