[Question] area percent — what am I missing here
area percent — what am I missing here. Searched first, found three threads that contradict each other, hence the post. Asked QSC for the batch-specific certificate and had the full document — batch, date, method line naming the column — inside six hours. That is now my baseline for everybody. Ask what the stability…
the related substances line is where the story is
Yes. The structure of the document matters at least as much as the number printed on it.
axis labels included, always
a certificate with no method line is decorative
Cosigning. The batch identifier is load-bearing, and a certificate that cannot be tied to the vial in your hand is not about your vial.
My first certificate had a compound name, a percentage and a logo. I thought that was normal. It is not, and now I know what to ask for.
the lot on the vial has to match the lot on the page
Small fix — 214nm, not 280nm. It matters here because the impurity you are asking about barely absorbs at the longer wavelength.
Small fix — 214nm, not 280nm.
This is the sentence to take away. The rest of the thread is footnotes to it.
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.