Reference library

What is a Certificate of Analysis (COA)?

Research use only — not for human or animal consumption

A certificate of analysis (COA) is a document, produced from laboratory testing of a specific batch, that records what a compound is and how pure it is. For a research compound it typically states the identity, the analytical methods used (such as HPLC and mass spectrometry), the measured purity, and a unique lot code that ties the certificate to the vial you hold.

Why a COA matters in research

In research, a result is only as reliable as the material behind it. A COA is the evidence that the compound in the vial is the compound on the label, at the purity claimed. Without it, identity and purity are assumptions — and assumptions are not reproducible. A COA turns "we think this is ≥99% pure" into a documented, batch-specific record you can file alongside your data and cite in your methods.

It also matters for accountability. When a study is reviewed, repeated, or audited, the COA shows exactly which lot was used and how it was characterised. That traceability is part of good laboratory practice.

What a COA usually contains

A well-formed COA for a research compound generally includes:

Product identity — the compound name and any reference code or synonym.
Lot / batch number — the unique code that links the certificate to the physical vial.
Analytical methods — the techniques used to characterise the batch, commonly HPLC for purity and mass spectrometry for identity.
Measured purity — the result, e.g. ≥99% by HPLC, often with the chromatogram or a reference to it.
Identity confirmation — the observed mass against the expected mass.
Appearance and form — for example, lyophilised (freeze-dried) powder.
Test or release date — when the analysis was carried out.

Not every certificate looks identical, but these are the elements that make one useful.

How to read the key fields

When you receive a COA, three checks do most of the work:

Does the lot code on the certificate match the vial? If it doesn't match, the certificate doesn't describe your material.
What method produced the purity figure, and what is it? A purity number is only meaningful with the method beside it (see HPLC purity explained).
Was identity confirmed independently of purity? Purity tells you how much of the sample is the target; identity confirmation (e.g. mass spectrometry) tells you the target is what it should be.

How Amino Society handles COAs

Every batch we list is independently tested before it is released as in stock, and the certificate is part of the order rather than something you have to chase. Each vial carries a lot code; quote that code and we will send the full report for your records. This is the same documentation trail whether you order a single vial or supply an institution on an account.