how much of what we believe about COA actually comes from area percent threads
Genuine question, and the title is the question: how much of what we believe about COA actually comes from area percent threads. 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. Asked for the storage condition behind the stability…
What does the method line actually say? Not the technique — the column and the gradient.
Did you get the chromatogram or only the summary line?
Sent one vial to Janoshik and Medutest. 97.9% and a claimed 97.0%. Cost me more than the vial and I would do it again.
Sent one vial to Janoshik and Medutest.
aurel_boateng has the distinction right — one is a fraction of the detector signal, the other is a fraction of the mass.
Disagree that a lower number is automatically worse. A conservative claim that survives testing is worth more than an optimistic one that does not.
Agreed on asking for the storage condition. It is one line and it changes how you read the entire stability claim.
the counterion is part of the mass you paid for
a total of 0.4% tells you less than four named impurities adding to 0.6%
Yes. The structure of the document matters at least as much as the number printed on it.
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.