Independent analysis of a research peptide in Greece: where and how

Where can a Greek buyer send a vial for independent testing, and what should they ask for?

A buyer of research material in Greece has three realistic routes for having a sealed vial checked by a third party: a private testing laboratory listed in the catalogue of the Hellenic Accreditation System (E.SY.D.), a university laboratory that takes on services for outside parties, and the General Chemical State Laboratory. None of the three is a ready-made «peptide testing service» with an off-the-shelf form. In all of them the request is individual and written, and your first job is to establish that the laboratory has the instrument, the method and the willingness to accept your sample.

The second thing to know is what you are asking for. Identity (the vial holds a mass that corresponds to the sequence) and purity (what share of the peptidic material is the correct molecule) are two different tests with different instruments and different limits. If you write «peptide analysis» on the request, you get whatever the laboratory considers reasonable. If you write which test, by which method and against which reference, you get something that can be laid next to the supplier's COA.

What «independent» means, and why the seller's COA is not enough

The COA that accompanies a lot is a document from the supplier or from the laboratory the supplier chose. It may be complete and honest, but the reader has no way to know which sample was measured or whether the vial in hand came from it. An independent test means three things together: you choose and seal the sample, the laboratory has no commercial stake in the result, and the report comes directly to you.

That does not make the test infallible. ISO/IEC 17025 asks laboratories for impartiality, validated methods and traceable measurements ^[2], but a laboratory can apply a method correctly and still apply the wrong method for your question. The quality of the request matters as much as the quality of the laboratory.

The three routes in Greece

The table summarises what we know and do not know about each route, as established from public pages on 10 October 2026. We deliberately do not name a private laboratory as suitable: we have not verified that any specific laboratory accepts peptide samples, and only the laboratory itself can answer that.

The university and state-laboratory routes each have a dedicated article in the same research journal, with the details of the procedure.

How to read the E.SY.D. catalogue

The E.SY.D. laboratory catalogue offers two search fields: by name, and by accreditation certificate or standard number. Results are paginated, with a «detailed information» link for each entry ^[1]. The list page itself shows no distinction between testing and calibration laboratories and no scope of accreditation; those are looked up on the page of each entry.

The practical consequence: a laboratory's presence in the catalogue does not prove it can run your test. Accreditation is granted per method and per scope. A laboratory accredited for pesticide residues in food is not automatically accredited for the purity of a synthetic peptide. If you cannot find the scope or cannot interpret it, ask the laboratory for its accreditation certificate with the annex, and ask explicitly whether the specific test you want falls inside it.

What exactly to request

Write the request as a list of tests. For a synthetic peptide the two core tests are purity by liquid chromatography (HPLC) and identity by mass spectrometry. For the first, it is worth reading what the HPLC purity percentage measures and what it leaves out: it is a ratio of peak areas, not a percentage by mass. For the second, see what a mass-spectrometry identity check proves and what it does not: the intact mass matches the theoretical mass or it does not; it does not confirm the sequence.

• An identity test by LC-MS or another mass-spectrometry technique, stating the theoretical mass, the measured mass and the tolerance.
• A purity test by HPLC, with the chromatogram, column, detection wavelength and integration table in the report.
• The method, and whether it is validated for this kind of analyte; if it is a general in-house method, the report should say so.
• The acceptance criterion applied, if any, or a statement that the report gives results only, with no judgement of conformity.
• Optionally, and only if the laboratory offers it, a separate peptide-content test; it cannot be inferred from purity.

What the laboratory needs from you

A laboratory that accepts a third party's sample cannot test it without information about it. Prepare before the first contact: the full sequence and molecular formula, so the laboratory can calculate the theoretical mass; the lot number as written on the vial; the salt form if known; and a short statement of purpose: that this is research material and that the test concerns documentation of the lot.

Also ask how much material the laboratory needs, whether it wants a reference standard from you and whether it may consume the sample. The last point matters: if you want a repeat test later, you need a remainder. Packaging, courier choice and protection from heat are handled in a separate article, because that is where it is decided whether the sample arrives in acceptable condition.

Cost, turnaround and what a report contains

We give no prices or turnaround times, because we have not verified them for peptide analysis. The only public price list we read, that of the General Chemical State Laboratory, is organised by product category and in annexes that we did not check for peptides ^[4]. The quotation you receive should state which tests it includes, how many samples, whether VAT is included and when the report is expected.

A test report from a laboratory working under ISO/IEC 17025 has a defined minimum content: identification of the sample as received, dates, the method, the results and the signature of an authorised person ^[2]. Read it in the same order as a COA: first that it concerns your vial, then the method, then the number.

What a single test does not prove

A test concerns one sample, from one lot, on one date. It says nothing about the supplier's next lot, or about what happened to the vial after sampling. A result that matches the COA strengthens the documentation of that lot; it does not certify the supplier. A result that does not match does not by itself prove intent or error: it may reflect a difference of method, storage, or a sampling mistake.

What to do next

Choose one route, write the request as a list of tests and ask for a written quotation. In the lot file keep: the request, the quotation, the proof of sample delivery, the report and, where there is one, the accreditation certificate with its scope. Compare the report with the supplier's COA field by field and note the differences with a date; a difference that was never recorded cannot be discussed later.

For the state laboratory and the universities the legal basis is public. Decision 30/002/000/6484/2024 provides that applicants may be natural persons and businesses ^[4], and article 53 of Law 5094/2024 that university laboratories may take on services for bodies of the private or public sector ^[5]. Neither shows that a specific laboratory will accept your sample; the laboratory settles that. The Laboratory of Analytical Chemistry at the Aristotle University of Thessaloniki, for example, lists techniques such as HPLC and LC-MS on its page without mentioning services to third parties ^[3]: owning an instrument is not the same as offering a service.