---
title: "Isotope pattern: research glossary | Sable Peptides"
description: "An isotope pattern, or isotopic envelope, is the cluster of peaks in a mass spectrum arising from molecules containing different combinations of naturally"
canonical: https://www.sablepeptides.co.uk/glossary/isotope-pattern
publisher: Sable Peptides Limited (UK company 17488610)
note: Research use only. Not for human or veterinary use.
---

Glossary

# Isotope pattern

An isotope pattern, or isotopic envelope, is the cluster of peaks in a mass spectrum arising from molecules containing different combinations of naturally occurring isotopes, mainly carbon-13. The pattern's shape depends on elemental composition and is used to confirm molecular formulas and determine charge states of peptide ions.

Source: [osti.gov](https://www.osti.gov/biblio/1003289)

## Related terms

-   [Peptide](/glossary/peptide)

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