---
title: "Methionine: research glossary | Sable Peptides"
description: "Methionine (three-letter code Met, one-letter code M) is a sulfur-containing amino acid with a thioether side chain. Methionine is readily oxidised to meth"
canonical: https://www.sablepeptides.co.uk/glossary/methionine
publisher: Sable Peptides Limited (UK company 17488610)
note: Research use only. Not for human or veterinary use.
---

Glossary

# Methionine

Methionine (three-letter code Met, one-letter code M) is a sulfur-containing amino acid with a thioether side chain. Methionine is readily oxidised to methionine sulfoxide, increasing mass by 16 Da, which is a common degradation product seen by mass spectrometry. Antioxidant scavengers are often included during cleavage.

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

## Related terms

-   [Amino acid](/glossary/amino-acid)
-   [Cleavage](/glossary/cleavage)
-   [One-letter code](/glossary/one-letter-code)
-   [Mass spectrometry](/glossary/mass-spectrometry)

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