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Technical Reference · Compound Verification

How to Read a Peptide Certificate of Analysis

A certificate of analysis is a document, not a credential. It records what was tested on one specific batch, by whom, and on what date — and reading it properly means knowing which fields carry weight, which are routinely omitted, and which can be checked without taking anyone’s word for it.

Field by field What you can verify Seven red flags

See the anatomy

1 batch

What a certificate describes — never a product line

2 tests

Identity and purity answer different questions

13 fields

On a complete certificate. Most carry four or five

0 authorities

No regulator issues, approves, or endorses a COA

First Principles

What a certificate of analysis is, and what it is not

The word “certificate” does a lot of unearned work in this market. Clearing up what the document actually is makes every other field on it easier to read.

📋

It is a test record

A report of specific analyses run on a specific lot, on a specific date. It says “here is what we measured.” Its value comes entirely from which tests were run and how clearly the methods are stated.

🔑

It is batch-specific

A certificate describes one lot. A document without a batch number, or with one that does not match the label on your vial, is describing something other than what you are holding.

⚠️

It is not an approval

No regulator issues, reviews, or endorses a COA. It carries no authorization, and a compound with a comprehensive certificate is exactly as unauthorized as one without.

The distinction that matters most

A certificate answers “is this material what it claims to be, and how clean is it?” It does not answer whether the compound is safe, effective, or lawful to use in any particular way. Those are separate questions with separate answers, and no analytical document can speak to them.

Field By Field

The anatomy of a complete certificate

Thirteen fields, in the order they usually appear. The tag on each shows how often you will actually find it — because the gap between what a certificate could carry and what most carry is the whole reason this page exists.

Certificate of Analysis Illustrative layout

Product name & sequence

The compound identified unambiguously, ideally with the one-letter amino acid sequence. A name alone is not an identification — many compounds are sold under several names, and some names cover more than one molecule.

Standard

Batch / lot number

Ties this document to the vial in your hand. Check it against the label. This is the single field that makes everything below meaningful.

Standard

Manufacture & test dates

When the material was made and when it was analyzed. Analysis long after manufacture, or a certificate several years old, tells you less about the vial’s present condition than about its past.

Standard

Appearance

Typically “white to off-white lyophilized powder.” Trivial-looking, but a discolored or collapsed cake is visible evidence that something happened in handling.

Standard

Identity — mass spectrometry

Observed mass against theoretical mass for the sequence, by ESI-MS or MALDI-TOF. Both numbers should be printed. “Conforms” with no figures is an assertion, not a result.

Sometimes

Purity — HPLC

Area percent, with the method: column, gradient, and detection wavelength. A percentage without its method is not reproducible and not comparable to anyone else’s percentage.

Standard

Chromatogram

The actual trace, with labeled axes. Lets you see peak shape, shoulders and co-elution rather than trusting one integrated number.

Often missing

Net peptide content

Mass percent of the powder that is peptide, by amino acid analysis. A different measurement from purity and usually a much lower number — see purity vs net peptide content.

Rarely

Water content

By Karl Fischer titration. Part of the mass balance, and a direct indicator of how well the material has been sealed and stored.

Rarely

Counterion & salt form

Which salt, and how much. TFA and acetate forms of the same sequence have different mass balances at identical chromatographic purity.

Rarely

Residual solvents

Trace process solvents by gas chromatography, against ICH Q3C class limits. Expected in small amounts; the question is whether anyone measured.

Rarely

Storage conditions

The conditions the stated figures were established under. Values on a certificate describe material stored as specified, not material stored otherwise.

Standard

Testing lab, analyst & signature

Who performed the analysis and whether they are independent of the seller. An unattributed certificate cannot be followed up, and a lab that cannot be looked up cannot be checked.

Sometimes

Check It Yourself

The one field you can verify without any equipment

If a certificate prints both the sequence and the observed mass, you can confirm they agree using nothing but arithmetic. It is the cheapest and most informative check available to a buyer, and almost nobody performs it.

Worked identity check — a hypothetical certificate

Sequence, as printed on the certificate15 residues

Theoretical average mass, from the sequence1498.6 Da

Observed mass, as printed1499.4 Da

Difference+0.8 Da

Verdict — within instrument toleranceAgrees

How to read the difference

Small discrepancies of a dalton or less are normal — they come from instrument calibration and from whether the figure is an average or monoisotopic mass. What matters is the size and the pattern of the gap.

A difference of +16 suggests oxidation. +1 can indicate deamidation. A gap of a hundred daltons or more is not a rounding question: it means the certificate and the sequence are describing different molecules, and that is worth an explanation before anything else on the page matters.

What To Look For

Seven things that should prompt a question

None of these proves a problem on its own. Each one means something is unverifiable, and unverifiable is the state a certificate exists to remove.

No batch number

Or one that does not match the vial. The document is then describing some material, not your material, and every figure on it is decorative.

Unverifiable

A percentage with no method

“Purity >99%” with no column, gradient or wavelength. Different methods give different numbers for the same material, so an unmethodded figure cannot be compared with anything.

Not comparable

Identity stated as “conforms”

Without observed and theoretical masses printed, the identity claim is an assertion. The two numbers cost nothing to include and are the ones a reader can check.

Unverifiable

A reused chromatogram

The same trace appearing across different products or batches, or an image with axes stripped off. A chromatogram that cannot be tied to a lot is an illustration.

Not batch-specific

Impossible precision

A purity figure quoted to two decimal places implies a repeatability the method does not have. Overstated precision usually signals a number that was typed rather than measured.

Overstated

No date, or a stale one

Analysis is a snapshot. A certificate with no test date, or one several years old, describes the material as it was, not as it is.

Out of date

An unnamed or unfindable lab

If the testing lab is not named, or cannot be looked up, nothing on the certificate can be followed up with anyone. Attribution is what makes a document answerable.

Unattributable

Regulatory language

“GMP,” “pharmaceutical grade,” or “approved” on a research certificate. These describe regulatory states a COA cannot confer, and their presence suggests the document is doing marketing work.

Misleading

Who Ran The Test

Manufacturer certificates and third-party certificates

Both are legitimate and they are not equivalent. The difference is independence, and it changes what a figure is worth rather than whether it is true.

	Manufacturer COA	Third-party COA
Run by	The synthesizer’s own QC laboratory	An independent analytical lab
Covers	Usually every batch as standard	Often a sample of batches, commissioned
Independence	The tester has an interest in the result	No commercial interest in the outcome
Typical depth	Identity, purity, appearance	Whatever was commissioned — often purity and identity only
Best used for	Batch-to-batch consistency	Confirming the supplier’s own figures
Weakness	Unverified by anyone outside	May not cover the specific lot you received

The question worth asking

Not “do you have a COA” — everyone says yes. Ask “is this certificate for my lot, who ran it, and can I see the chromatogram?” The answer to that separates suppliers far more effectively than any published purity figure, because it is a question about documentation practice rather than about a number.

A Four-Step Read

How to work through a certificate you have been sent

In this order, because each step makes the next one meaningful. There is no point scrutinizing a purity figure on a document that describes a different batch.

1

Match the lot

Compare the batch number on the certificate against the label on the vial. If they differ, stop here and ask — nothing further on the page applies to your material.

2

Check identity

Find the observed and theoretical masses. Confirm they agree within about a dalton, and note the size of any gap against the oxidation and deamidation patterns above.

3

Read purity with its method

Note the wavelength, column and gradient alongside the percentage. A figure without them cannot be compared to another supplier’s figure or reproduced later.

4

Note what is absent

List the fields that are not there — net peptide content, water, counterion, chromatogram. Those are the questions this certificate leaves open, and they are the ones to put to the supplier.

Common Questions

Certificates of analysis

Does a certificate of analysis mean a compound is approved or regulated?

No. A COA is an analytical test record produced by a laboratory. No regulator issues, reviews, or endorses one, and it confers no authorization of any kind. A compound with a thorough certificate is exactly as unauthorized as one without. The certificate speaks to what is in the vial, not to what may lawfully be done with it.

What is the difference between a COA and a third-party test report?

A manufacturer COA is produced by the synthesizer’s own quality control laboratory, usually for every batch. A third-party report comes from an independent lab with no commercial interest in the result, but is often commissioned for selected batches rather than run as standard. They answer the same questions with different degrees of independence, and the useful position is having both.

Why does the purity on the certificate not match the amount of peptide I have?

Because they are different measurements. HPLC purity is a share of the material the detector can see; net peptide content is a share of the powder’s mass, including counterion salt and residual water that are invisible to HPLC. A vial can be 99% pure and around 80% peptide by mass with no contradiction.

Can I verify a certificate of analysis myself?

Partly, and it is worth doing. You can match the lot number to your vial, calculate the theoretical mass from the printed sequence and compare it to the observed mass, check that a method accompanies the purity figure, and look up the testing laboratory. What you cannot do without instruments is re-run the analysis, which is why independent testing exists.

How recent should a certificate be?

Ideally it should be the analysis performed on your batch at or near the time it was produced. There is no fixed shelf life for the document, but analysis is a snapshot: a certificate from several years ago describes material as it was then, and says nothing about storage and handling since. Test date and manufacture date should both appear and should be close together.

What if the supplier will not provide a chromatogram?

It is a reasonable request and a reasonable thing to weigh in the answer. The chromatogram is the underlying evidence for the purity figure, and it shows peak shape, shoulders and co-elution that a single integrated percentage cannot. A supplier who holds the data and declines to share it is telling you something about their documentation practice.

Sourcing Research Materials In Canada

Batch-documented, domestically shipped

NuMe supplies HPLC-verified, batch-documented research compounds to Canadian laboratories and institutions, shipped domestically so material spends less time in transit.

Explore the Catalogue

Disclaimer: This page is provided for educational and informational purposes only. It does not constitute medical advice, and it contains no guidance on the use of any compound in people. All NuMe products are supplied strictly for laboratory research and in-vitro testing. They are not approved for human consumption, veterinary use, or any therapeutic application. Peptides are generally regulated as prescription drugs in Canada. Individuals seeking peptide therapy should consult a licensed healthcare practitioner.