Sample Peptide CoA Field Guide

This page explains the fields a research peptide certificate of analysis should contain. It is an annotated field guide for procurement and QA — not a substitute for the lot-specific CoA that ships with an order. Live, searchable lots are published in the CoA Library.

Sample CoA fields (what to expect)

Field	What it should tell you	Fail / escalate if…
Product / SKU name	Matches the catalog listing and vial label	Name and vial disagree
Lot / batch number	Ties vial, CoA, and inventory record	Missing or mismatched lot
HPLC purity	Area-percent purity for the releasing method	Purity claimed with no method or chromatogram path
MS identity	Observed mass matches expected form (free acid/amide/acylated)	No MS result, or mass does not match the labeled form
Net peptide content	Active peptide mass fraction for concentration math	Required for molarity work but absent
Appearance / form	Lyophilized cake/powder notes consistent with receipt	Unexpected physical state for the SKU
Water / residual solvents (when reported)	Supports mass-balance and storage decisions	Out-of-spec vs stated acceptance criteria

How to use this with a real shipment

Match vial lot → CoA lot → packing slip.
Confirm HPLC + MS + (when needed) net peptide content.
Cross-check published lots in the CoA Library.
Follow the lot verification walkthrough and HPLC / MS / net peptide decision tree.

What this page is not

It does not publish fabricated lot numbers or pretend sample chromatograms as live certificates. For real lot data, use the CoA Library and the document included with your shipment.