---
title: "Fluorescein isothiocyanate: research glossary | Sable Peptides"
description: "Fluorescein isothiocyanate (FITC) is a derivative of fluorescein that reacts with primary amines to form stable thiourea linkages, introducing a green fluo"
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publisher: Sable Peptides Limited (UK company 17488610)
note: Research use only. Not for human or veterinary use.
---

Glossary

# Fluorescein isothiocyanate

Fluorescein isothiocyanate (FITC) is a derivative of fluorescein that reacts with primary amines to form stable thiourea linkages, introducing a green fluorescent label. It is commonly used to label peptides at the N-terminus or lysine side chains. Fluorescein emission is pH-sensitive and susceptible to photobleaching.

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

## Related terms

-   [N-terminus](/glossary/n-terminus)
-   [Lysine](/glossary/lysine)

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

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