Testing & quality

Purity

Also known as: area purity · hplc purity

The proportion of the detectable material in a sample that is the target peptide rather than peptide-related impurities.

In plain terms

Purity compares the peptide against the by-products of its own synthesis — truncated chains, deletion sequences, oxidised variants. It says nothing about sterility, heavy metals, endotoxin, or identity.

Around 98% area purity is the usual working expectation for research material. Honest figures vary batch to batch; a catalogue where everything is exactly 99.9% is telling you something, though not about purity.

Guides that use this term

How to read a peptide certificate of analysis

What a real certificate of analysis contains, why 99% purity does not mean 99% peptide, and the tells that separate a laboratory measurement from a marketing graphic.

Educational reference only. Pepperz does not provide medical advice, diagnosis, treatment, prescribing guidance, or dosing recommendations.