Peptide COA Verification Guide: HPLC & Mass Spectrometry

A complete laboratory guide to inspecting Certificate of Analysis (COA) documents. Understand HPLC chromatogram peak integration, mass spectrometry mass-to-charge (m/z) ratios, and endotoxin limit testing under USP <85>.

1. Reading HPLC Purity Chromatograms

High-Performance Liquid Chromatography (HPLC) separates chemical components based on their chemical affinity to a stationary column. A certified research peptide should demonstrate a single dominant peak at its documented retention time, with impurity peaks totaling less than 1.0% of total integrated area (> 99.0% purity).

⚠️ Red Flag: Flat baselines without detector baseline noise or identical chromatograms copy-pasted across different batches indicate fabricated laboratory test certificates.

2. Mass Spectrometry (MS) Molecular Weight Confirmation

While HPLC confirms purity percentage, it does not prove the identity of the molecule. Mass Spectrometry (ESI-MS or MALDI-TOF) measures the mass-to-charge ratio (m/z). The observed monoisotopic or average molecular weight must match the theoretical peptide formula within ±1.0 Dalton.

3. Cryptographic Verification with Testing Laboratories

Leading independent testing facilities provide direct verification mechanisms:

Janoshik Analytical: Look for the 10-character alphanumeric cryptographic key at the bottom of the COA. Enter it directly on janoshik.com to verify that the uploaded PDF has not been altered.
MZ Biolabs: Confirm the laboratory task number and date directly against their active reporting portal.

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