---
title: "Arginine: research glossary | Sable Peptides"
description: "Arginine (three-letter code Arg, one-letter code R) is a strongly basic amino acid with a guanidinium side chain that remains positively charged across mos"
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---

Glossary

# Arginine

Arginine (three-letter code Arg, one-letter code R) is a strongly basic amino acid with a guanidinium side chain that remains positively charged across most of the pH range. Arginine-rich peptides are highly water soluble and bind counter-ions such as trifluoroacetate. Its side chain is usually protected with a Pbf group in Fmoc synthesis.

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

## Related terms

-   [Amino acid](/glossary/amino-acid)
-   [One-letter code](/glossary/one-letter-code)

[Back to glossary A–Z](/glossary/terms)

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