[Vendor] SSA vs TFC on the same compound, same month — both cleared 97.5%
SSA vs TFC on the same compound, same month — both cleared 97.5%. I will put the method line and the batch identifier up front because that is what makes this checkable. 97.5%. Those are measured, not estimated, and not rounded up in my favour. Started keeping a folder of every certificate I have been sent. The ones…
Agreed on asking for the storage condition. It is one line and it changes how you read the entire stability claim.
Does the lot on the vial match the lot on the page?
identity and quantity are two questions and most documents answer one
Small fix — 214nm, not 280nm. It matters here because the impurity you are asking about barely absorbs at the longer wavelength.
Batch number and date of analysis, are both on there?
That is the catalogue certificate rather than the batch-specific one. Same layout, completely different status.
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.