Why Two Certificates of Analysis Can Disagree on Purity
Two laboratories can analyse the same peptide and report different purity figures without either being wrong.
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Two laboratories can analyse the same peptide and report different purity figures without either being wrong.
A purity percentage is a summary. The chromatogram it came from carries information the number discards, and reading it is a skill worth having if you buy peptides regularly.
Two analytical questions sit behind every research peptide: is this the right molecule, and how much of the vial is that molecule rather than something else?
A Certificate of Analysis (COA) is the document that separates a characterised research compound from an unknown powder. It is also the document most buyers skim without reading.
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