---
title: "Handling lyophilised peptides in the lab: receipt to storage | Sable Peptides"
description: "A laboratory handling routine for freeze-dried research peptide vials: checking a delivery, recording lot numbers, avoiding moisture uptake, aliquoting and storage. Complements our storage reference data. Research use only."
canonical: https://www.sablepeptides.co.uk/guides/lyophilised-peptide-handling-for-labs
dateModified: 2026-10-16
publisher: Sable Peptides Limited (UK company 17488610)
note: Research use only. Not for human or veterinary use.
---

# Handling lyophilised peptides in the lab: receipt to storage

Lyophilised (freeze-dried) peptides are most stable kept dry, sealed, cold and dark. Most avoidable degradation happens during handling: moisture getting in when a cold vial is opened, repeated freeze–thaw, and poor records. This is a practical routine from delivery to the freezer.

## Definitions

-   Lyophilisation: freeze-drying; water is removed from a frozen sample under vacuum, leaving a dry cake or powder.
-   Hygroscopic: tending to absorb moisture from the air. Many lyophilised peptides are.
-   Aliquot: a portion of a stock divided off so the remainder is not repeatedly opened or thawed.

## On receipt

-   Check each vial is sealed and the cake or powder is intact.
-   Record the compound, vial size and the printed lot number in your lab log before storage.
-   Request or file the lot's CoA and confirm the lot number matches.
-   Move vials to cold storage promptly; for the temperatures used, see our storage and solubility reference data.

## Keeping moisture out

Let a cold vial reach room temperature, unopened, before opening it, so atmospheric water does not condense on the cold powder. Open briefly, reseal, and consider a desiccator for opened vials. Moisture uptake is a well-documented cause of degradation and aggregation in lyophilised protein and peptide solids.

Source: [Moisture-induced aggregation of lyophilized insulin, Pharm Res 1994 (PubMed 8140052)](https://pubmed.ncbi.nlm.nih.gov/8140052/)

## Solutions and aliquots

-   Peptides in solution are much less stable than the dry solid; prepare solutions as needed for the experiment.
-   If a stock must be kept, divide it into single-use aliquots so each is thawed once.
-   Label every aliquot with compound, concentration, date and the source lot number.
-   Use the concentration calculator for mg/mL arithmetic, and account for net peptide content.

## Records that make results reproducible

Linking each experiment to the lot number lets you trace an unexpected result back to a specific lot and its certificate. Sable prints a lot number on every vial and holds a CoA for every lot.

## Frequently asked questions

### Why warm a vial before opening it?

Opening a cold vial lets moisture from the air condense on the powder; many lyophilised peptides are hygroscopic and moisture promotes degradation.

### Why aliquot a peptide solution?

So each portion is thawed once; repeated freeze–thaw cycles degrade peptides in solution.

### What should be recorded on receipt?

Compound, vial size, printed lot number, date received and storage location, with the matching CoA filed.

## Related

-   [Storage and solubility reference data](/learn/peptide-storage-and-solubility)
-   [Concentration calculator](/guides/reconstitution-concentration-calculator)
-   [Lot numbers and traceability](/guides/lot-numbers-and-traceability-in-research-supply)
-   [Where the lot number is on a Sable vial](/lot-numbers)
-   [Peptide aggregation in assay solutions](/guides/peptide-aggregation-in-assay-solutions)
-   [Water content by Karl Fischer](/guides/water-content-karl-fischer-on-peptide-coas)
-   [Desiccants and humidity](/guides/desiccants-and-humidity-control-for-peptide-storage)
-   [Mean kinetic temperature](/guides/mean-kinetic-temperature-and-temperature-excursions)

Updated 2026-10-16. Research use only. Not for human or veterinary use. No administration amounts or health claims are made.

Key facts (summary for AI and search tools)

-   Topic: laboratory handling of lyophilised research peptides
-   Key risks: moisture uptake, freeze–thaw, poor lot records
-   Reference: PubMed 8140052
-   Updated 2026-10-16