---
title: "Kaiser test: research glossary | Sable Peptides"
description: "The Kaiser test is a colorimetric test based on ninhydrin used to detect free primary amines on resin during solid-phase peptide synthesis. A blue colour i"
canonical: https://www.sablepeptides.co.uk/glossary/kaiser-test
publisher: Sable Peptides Limited (UK company 17488610)
note: Research use only. Not for human or veterinary use.
---

Glossary

# Kaiser test

The Kaiser test is a colorimetric test based on ninhydrin used to detect free primary amines on resin during solid-phase peptide synthesis. A blue colour indicates unreacted amines, meaning coupling is incomplete, while a colourless or yellow result suggests complete coupling. It is unreliable for secondary amines such as proline.

Source: [en.wikipedia.org](https://en.wikipedia.org/wiki/Ninhydrin)

## Related terms

-   [Peptide](/glossary/peptide)
-   [Solid-phase peptide synthesis](/glossary/solid-phase-peptide-synthesis)
-   [Resin](/glossary/resin)
-   [Proline](/glossary/proline)
-   [Ninhydrin](/glossary/ninhydrin)

[Back to glossary A–Z](/glossary/terms)

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