---
title: "Adduct ion: research glossary | Sable Peptides"
description: "An adduct ion is formed when a molecule associates with an ion other than a proton, such as sodium [M+Na]⁺, potassium [M+K]⁺ or ammonium [M+NH4]⁺. Adducts"
canonical: https://www.sablepeptides.co.uk/glossary/adduct-ion
publisher: Sable Peptides Limited (UK company 17488610)
note: Research use only. Not for human or veterinary use.
---

Glossary

# Adduct ion

An adduct ion is formed when a molecule associates with an ion other than a proton, such as sodium \[M+Na\]⁺, potassium \[M+K\]⁺ or ammonium \[M+NH4\]⁺. Adducts appear at characteristic mass offsets from the protonated species and are common in peptide mass spectra. They must be distinguished from genuine impurities.

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

## Related terms

-   [Peptide](/glossary/peptide)

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