identity and quantity are two questions and most COAs answer one
identity and quantity are two questions and most COAs answer one. It is the sort of thing everyone half-believes and nobody writes down. Asked for the storage condition behind the stability statement. Got it in a sentence. It is a two-line email and almost nobody sends it. My first certificate had a compound name, a…
Yes. The structure of the document matters at least as much as the number printed on it.
Spent four months confusing area% and mass% in every post I made here. One explainer thread and it clicked permanently.
That is the catalogue certificate rather than the batch-specific one. Same layout, completely different status.
Ask what the stability statement was written against — temperature, light, and whether it was the lyophilised powder or the reconstituted solution. Those are three different claims.
Are the related substances itemised or is it a single total?
Water content 3.8%, acetate 6.2%, purity 99%, net peptide about 90% of label weight. All four numbers honest, and I had to read it twice.
net peptide content and purity are two different numbers on the same vial
The PDF creation date being later than the analysis date is usually a re-issue or a re-export. It is worth one question and it is not evidence of anything on its own.
The document I was worried about turned out to be a re-issue with a later creation date. Asked, got the original, entirely ordinary.