how much of what we believe about area percent actually comes from COA threads
The title is the whole question — how much of what we believe about area percent actually comes from COA threads — but here is why I am asking. Started keeping a folder of every certificate I have been sent. The ones that itemise impurities are a small group and they are mostly the same suppliers. Water content 3.8%,…
Net peptide content is the fraction of the powder that is actually peptide once counterion, water and residual solvent are accounted for. A 99% pure acetate salt can still be about 85% peptide by mass.
Net peptide content is the fraction of the powder that is actually peptide once counterion, water and residual solvent are accounted for.
Disagree on this specific point. Two honest labs can resolve that impurity differently and report different numbers.
I would not read a rounded figure as evasive. Plenty of documents round to one decimal as house style.
Area percent is the peak area of your compound over the total integrated area, at one wavelength, on one gradient. It is a relative measure of what the detector saw, not a mass fraction of the vial.
That is the catalogue certificate rather than the batch-specific one. Same layout, completely different status.
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.