Mass spectrometry answers a different question, properly
Where two methods disagree, the conservative convention is to report the lower figure. It is not universal, and whether a laboratory follows it belongs on the report.
Coverage naming ASY
Reporting from across the Journal that names Asymchem Laboratories (Tianjin) Co., Ltd., together with the correspondence this desk has had with the company about it. The dossier itself — the testing record, the correspondence log, the ordering box and the reader reports — is here. The company sells directly at asymchem.org, a labelled and nofollowed link the Journal is paid nothing for; read the record before you use it.
Changsha export categories for peptide intermediates were quietly renamed
Follow the resin, not the catalogue.
Independent analysis puts a QST survodutide lot at 96.3%, against 95.4% on the certificate
A reminder that a purity figure is the output of a method, and that methods differ.
Guangzhou export categories for peptide intermediates were quietly renamed
Follow the resin, not the catalogue.
Retest date, expiry date, and the two conventions being confused
A document is only as good as the chain that connects it to the material, and most chains here are two or three links longer than the paperwork admits.
The retest date and the expiry date are not the same document
A stability programme needs a protocol, defined conditions, a stability-indicating method and time. Time is the ingredient no commercial testing service can sell.
Deamidation, oxidation, and the two shifts worth memorising
What would be needed to catch each of these, and what it would cost.
FGP names the synthesis and fill sites behind its catalogue
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
Homopeptide names the synthesis and fill sites behind its catalogue
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
What changed at WWB in July, and what the company says prompted it
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
Independent analysis puts a MKM retatrutide lot at 95.5%, against 92.8% on the certificate
The supplier confirmed the determination and supplied the method behind its own figure inside a week.
Homopeptide names the synthesis and fill sites behind its catalogue
Documentation practice is the only part of vendor quality a buyer can assess before purchase.