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Onex Peptides, Canadian research peptide supplier

Checklist

Certificate of Analysis Checklist

Check a certificate of analysis against what one should contain, and see which missing items are red flags and why.

The material

Identity

Purity

The document

Red flags

0 of 15 present. 15 missing:

  • Names the compound, with a CAS number or sequence

    Without an unambiguous identifier the certificate could describe a related compound or a different salt form.

  • Carries a lot or batch number

    A certificate with no lot number cannot be tied to any particular vial, including yours.

  • The lot number matches the label on the vial you hold

    A genuine certificate for a different lot says nothing about the material in front of you.

  • States the declared amount or fill

    The assay results are only meaningful against the amount the vial claims to contain.

  • Includes a mass spectrometry result

    Mass spectrometry is what confirms the vial holds the declared compound. Purity without identity can describe a different substance.

  • Shows the observed mass beside the theoretical mass

    A bare 'conforms' gives the reader nothing to check. Two numbers can be compared against the formula.

  • Reports HPLC purity as a specific number

    'Pass' or '>98%' with no measured figure hides the actual result.

  • Includes the chromatogram itself, not only the figure

    The trace is the evidence: peak shape, secondary peaks and baseline are what the percentage summarises.

  • Gives method details: column, detection wavelength, gradient

    Without the method, the figure cannot be reproduced or compared with another lab's.

  • The purity figure varies between lots rather than repeating exactly

    Identical figures to two decimal places across many lots suggest a template rather than measurements.

  • Identifies the laboratory, with an address or contact

    An unidentified lab cannot be asked to confirm the result, so the certificate cannot be verified.

  • Shows a date of analysis

    An undated result could predate the lot it is attached to.

  • Has a report or certificate number

    A unique report number is what a lab uses to confirm a document is theirs.

  • Is signed or authorised by a named analyst or reviewer

    An unsigned result has nobody accountable for it.

  • Looks unaltered: consistent fonts, sharp figures, no pasted blocks

    Mismatched type or blurred numbers around the result are the usual signs of an edited document.

What a certificate should let you check

A certificate of analysis is useful to the extent that it can be tied to your vial and verified with the lab that issued it. The items above are the ones that make that possible: an identifier for the material, a lot number that matches the label, an identity result, a purity result with its evidence, and a document that names who produced it and when.

A missing item is a reason to ask, not proof of a problem. Read how purity is measured for what each assay can and cannot tell you.

All products sold by Onex Peptides are supplied strictly as reference materials for in vitro laboratory research and analytical use. They are not drugs, foods, cosmetics or medical devices, and they are not for human or veterinary use, consumption or administration of any kind.