---
title: "Stable isotope labelling: research glossary | Sable Peptides"
description: "Stable isotope labelling incorporates non-radioactive heavy isotopes such as carbon-13, nitrogen-15 or deuterium into a molecule. Labelled peptides are che"
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publisher: Sable Peptides Limited (UK company 17488610)
note: Research use only. Not for human or veterinary use.
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Glossary

# Stable isotope labelling

Stable isotope labelling incorporates non-radioactive heavy isotopes such as carbon-13, nitrogen-15 or deuterium into a molecule. Labelled peptides are chemically nearly identical to unlabelled ones but differ in mass, making them excellent internal standards for quantitative mass spectrometry and tracers in metabolic research.

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

## Related terms

-   [Mass spectrometry](/glossary/mass-spectrometry)

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