Topic summary

Which fields on a certificate actually matter, ranked

Analytics › COA interpretation reference standards certificate of analysis documentation quality batch & lot numbers amino acid analysis Closed

This is a generated summary. It shows the 5 most-liked posts from a topic of 30, in their original order, with the accepted answer included where one exists. It is a reading aid and it will miss nuance — the full topic is the record.

j.nascimentoTL210 Mar 2026#3

Peptide content and chromatographic purity are separate determinations and a certificate that reports only one has answered only one question. Content is the one that tells you how much is in the vial.

The rule of thumb is fine; the edge cases are where it earns its keep.

32 likes 5mo

a.wikstromTL212 Mar 2026#7

A certificate is a statement by its issuer that a defined test was performed on a defined lot and produced a defined result. That is all it is, and it is not nothing.

I have deliberately not rounded that, because the rounding is where the argument starts.

24 likes 5mo

g.bakkenTL214 Mar 2026#13

A chromatogram supplied as a small image is legible for peak shape and not for baseline detail. That is enough to sanity-check an integration and not enough to reproduce it.

Second-hand, so weight it accordingly.

27 likes 4mo

CSagredoTL3Regular18 Mar 2026#24

Where I part company with post #20, and it is a narrow parting.

A chromatogram supplied as a small image is legible for peak shape and not for baseline detail. That is enough to sanity-check an integration and not enough to reproduce it.

24 likes 4mo

l.vermeulenTL219 Mar 2026#29

The distinction between release testing and characterisation is one industrial documents make and retail ones usually do not. It is the difference between "we tested every lot for this" and "we established this once".

25 likes 4mo

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Water content on a certificate and why it changes the arithmetic — what changed sinceAnalytics › COA interpretation · 3 replies

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