---
title: "Charge state: research glossary | Sable Peptides"
description: "Charge state is the number of charges carried by an ion, written as z. In electrospray mass spectrometry, peptides commonly appear as [M+2H]²⁺, [M+3H]³⁺ an"
canonical: https://www.sablepeptides.co.uk/glossary/charge-state
publisher: Sable Peptides Limited (UK company 17488610)
note: Research use only. Not for human or veterinary use.
---

Glossary

# Charge state

Charge state is the number of charges carried by an ion, written as z. In electrospray mass spectrometry, peptides commonly appear as \[M+2H\]²⁺, \[M+3H\]³⁺ and higher charge states. The spacing between isotope peaks, equal to 1/z, allows the charge state to be determined at high resolution.

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

## Related terms

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

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