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HPLC Purity Testing for Peptides, Explained

By the Banger Labs Research Team · Updated June 2026

HPLC Purity Testing for Peptides, Explained

Short answer: HPLC (high-performance liquid chromatography) separates the components of a sample so the target peptide can be measured as a percentage of the total — that figure is “HPLC purity.” ≥99% is considered excellent; ≥96% is the common floor. Identity is confirmed separately by mass spectrometry on the COA.

How HPLC works (in brief)

A sample is pushed through a column that separates molecules by their chemical properties; each component appears as a peak on a chromatogram. The area of the target peptide’s peak relative to all peaks gives the purity percentage.

Purity vs identity

HPLC tells you how much of the sample is the target; mass spectrometry confirms what the molecule is. A complete COA shows both. Learn to read one in how to read a peptide COA.

Frequently asked questions

What HPLC purity is good for a peptide?

≥99% is excellent; ≥96% is the common floor.

Does HPLC confirm identity?

No — HPLC measures purity; mass spectrometry confirms identity. Both belong on a COA.

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By the Banger Labs Research Team. For research use only. Not for human or veterinary use. Not a drug, food, or cosmetic. Educational information, not medical advice.