---
title: "Endotoxin: research glossary | Sable Peptides"
description: "Endotoxin refers to lipopolysaccharide (LPS) from the outer membrane of Gram-negative bacteria. Even trace amounts can trigger strong responses in immune c"
canonical: https://www.sablepeptides.co.uk/glossary/endotoxin
publisher: Sable Peptides Limited (UK company 17488610)
note: Research use only. Not for human or veterinary use.
---

Glossary

# Endotoxin

Endotoxin refers to lipopolysaccharide (LPS) from the outer membrane of Gram-negative bacteria. Even trace amounts can trigger strong responses in immune cells and confound cell-based experiments. Endotoxin levels in peptide preparations are measured using the Limulus amebocyte lysate (LAL) assay and expressed in endotoxin units (EU).

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

## Related terms

-   [Peptide](/glossary/peptide)

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