How to read a RUO Certificate of Analysis — peptide purity checklist

RUO COA checklist for Canadian laboratories: identity fields, lot matching, HPLC purity, fill-mass separation, and verification references.

A RUO Certificate of Analysis is a documentation record for research peptides Canada labs. It helps a lab compare identity fields, lot details, purity reporting, and issuing-laboratory references before filing an order record.

This checklist is for Research Use Only laboratory documentation. It is not for human or veterinary use, and it is not health, therapeutic, or dosing guidance. Buyers must be 21+.

Key takeaways

Question	Short answer	Source
First field to read	Lot or batch number, then match it to the vial	Lot matching
Purity	An HPLC peak-area ratio for the tested sample	D'Hondt et al. 2014
Identity	A measured mass that fits the expected molecular weight	ICH Q2(R2)
Content	Measured peptide mass, separate from purity	Roux et al. 2008
Verification	Confirm the report number with the issuing laboratory	Janoshik verification

Start with identity fields

A lab should first check the compound name, nominal fill mass, physical form, lot identifier, issuing laboratory, and any accession or report reference. The certificate should match the vial label and the order record. Published certificates are listed on the COA index.

For GHK-Cu examples, compare the catalogue fields on GHK-Cu 50mg and GHK-Cu 100mg, then read the Canada sourcing notes at buy GHK-Cu Canada and GHK Cu peptide Canada research overview.

Lot match between vial label and COA

The lot or batch field is the bridge between the physical vial label and the certificate record. If the lot field does not match, treat the certificate as a separate record and do not attach it to that vial in your lab file.

HPLC purity versus fill mass

HPLC purity and fill mass are separate documentation fields. HPLC purity reports the analytical result for a tested material; it does not, by itself, establish the filled mass in a vial. Check the vial label, SKU, order record, and any lot-matched certificate fields where published.

Verification checklist references

Use Freedom Diagnostics peptide COA verification and Janoshik peptide COA as checklist references for field-by-field review. Then return to the COA index to compare the published document with the product record.

Catalogue context

The shop lists active RUO materials for Canadian labs. GHK-Cu catalogue examples include GHK-Cu 50mg and GHK-Cu 100mg, with Canada sourcing context at buy GHK-Cu Canada.

Research Use Only. Laboratory documentation for 21+ Canadian labs. Not for human or veterinary use.

Frequently asked questions

How do I read an RUO peptide COA?

Read it in order: lot number and match to the vial, issuing laboratory and report number, method, purity result, identity result, and content if reported. Then verify the report with the laboratory.

What does peptide purity on a COA mean?

It is the share of the target peptide among components detected by HPLC in the tested sample. It is not the mass fraction of peptide in the vial.

What is the difference between purity and content?

Purity is a ratio among detected components. Content is the measured mass of peptide in the vial. A certificate can report both, and they answer different questions.

What makes a COA unusable for a lab record?

No lot number, a lot that does not match the vial, no named laboratory or report number, or a report that cannot be verified with the laboratory.

References

D'Hondt M, Bracke N, Taevernier L, Gevaert B, Verbeke F, Wynendaele E, De Spiegeleer B. (2014). Related impurities in peptide medicines. Journal of Pharmaceutical and Biomedical Analysis, 101, 2–30. doi:10.1016/j.jpba.2014.06.012
Roux S, Zékri E, Rousseau B, Paternostre M, Cintrat JC, Fay N. (2008). Elimination and exchange of trifluoroacetate counter-ion from cationic peptides: a critical evaluation of different approaches. Journal of Peptide Science, 14(3), 354–359. doi:10.1002/psc.951
International Council for Harmonisation. (2023). ICH Q2(R2) Guideline on validation of analytical procedures, Step 5 (EMA/CHMP/ICH/82072/2006). ema.europa.eu (PDF)

Research Use Only. Not for human or veterinary use. Purchasers must be 21 or older.

Research Use Only

All content is provided for informational purposes for qualified researchers working with research materials in a laboratory setting. Products supplied by Hermetica Research Labs are sold strictly for in-vitro research. They are not intended for human or veterinary use, and nothing on this page constitutes medical, health, or dosing guidance. Must be 21+ to purchase.