---
title: "How should peptide stock solutions be aliquoted and recorded? | Sable Peptides"
description: "Why and how to divide a peptide stock solution into single-use aliquots: choosing volumes, tubes, labelling, freezing, records linking each aliquot to the vial's lot number, and when to discard. No dosing; research use only."
canonical: https://www.sablepeptides.co.uk/guides/aliquoting-peptide-stock-solutions
dateModified: 2026-10-16
publisher: Sable Peptides Limited (UK company 17488610)
note: Research use only. Not for human or veterinary use.
---

# How should peptide stock solutions be aliquoted and recorded?

Aliquoting means dividing a freshly prepared stock solution into single-use portions so the main stock is never repeatedly thawed or opened. Use low-binding tubes, label each with compound, concentration, date and lot number, freeze promptly, and thaw each aliquot once. A simple log links every aliquot to the original vial's CoA.

## Why aliquot at all?

Each freeze–thaw cycle exposes a peptide to ice interfaces, concentration effects and condensation. Studies of compound libraries in DMSO and of biomolecules in tissues both show measurable losses with repeated cycles; single-use aliquots avoid the problem.

Source: [The effect of freeze/thaw cycles on the stability of compounds in DMSO, J Biomol Screen 2003 (PubMed 12844443)](https://pubmed.ncbi.nlm.nih.gov/12844443/); [Impact of repeated freeze-thaw cycles on biomolecule quality, Biopreserv Biobank 2017 (PubMed 28930488)](https://pubmed.ncbi.nlm.nih.gov/28930488/)

## What should each aliquot label and log entry contain?

| Field | Example |
| --- | --- |
| Compound | As on vial |
| Lot number | As printed on vial |
| Concentration | e.g. 1 mg/mL (from your calculation) |
| Solvent | e.g. sterile water, 0.1% acetic acid |
| Prepared | Date, initials |
| Aliquot ID | Stock-A-01 to -20 |
| Storage | −80 °C, box and position |

## Which practical steps help?

-   Choose an aliquot size that matches one experiment.
-   Use low-binding polypropylene for dilute or sticky peptides.
-   Freeze quickly and keep aliquots upright.
-   Thaw on ice or at room temperature once; do not refreeze.
-   Discard aliquots past the period your own stability check supports.

## How does Sable document lots?

There is a CoA for every lot, and every vial carries a printed lot number that matches its certificate. A CoA is emailed within 2 hours of a request.

## Frequently asked questions

### Why aliquot peptide stock solutions?

To avoid repeated freeze–thaw cycles and repeated opening of the main stock.

### Can a thawed aliquot be refrozen?

Best practice is not to; use each aliquot once.

### What should be on an aliquot label?

Compound, lot number, concentration, solvent, preparation date and an aliquot ID.

## Related

-   [Concentration calculator](/guides/reconstitution-concentration-calculator)
-   [Freeze–thaw and pH shift](/guides/freeze-thaw-and-ph-shift-in-frozen-peptide-solutions)
-   [Surface adsorption](/learn/tech-notes/peptide-surface-adsorption)
-   [−20 vs −80 °C](/guides/minus-20-vs-minus-80-freezers-for-peptide-storage)

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)

-   Single-use aliquots; no refreezing
-   Label: compound, lot, concentration, solvent, date, ID
-   References: PubMed 12844443, 28930488
-   Updated 2026-10-16