[Discussion] can we stop arguing about COA until somebody posts a number
Genuine question, and the title is the question: can we stop arguing about COA until somebody posts a number.
Spent four months confusing area% and mass% in every post I made here. One explainer thread and it clicked permanently.
Asked QST 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.
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.
Research-use-only material is not approved for human use and nothing here should be read as a recommendation to use it.
best — the order this archive was captured in
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.
redact your own name, never the batch details
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.
the counterion is part of the mass you paid for
Sent one vial to Medutest and PeptideMeter. 98.4% and a claimed 97.5%. Cost me more than the vial and I would do it again.
That is not what the method line says. It names the technique; it does not certify the operator.
Does the lot on the vial match the lot on the page?
post the whole document, not the headline number