Holograms, QR codes and other things that are not verification
Reported from the analysis, not from a warning notice.
Coverage naming SIG
Reporting from across the Journal that names Sigma-Aldrich (Shanghai) Trading 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 sigmaaldrich.org, a labelled and nofollowed link the Journal is paid nothing for; read the record before you use it.
Independent analysis puts a Homopeptide tirzepatide lot at 99.3%, against 95.3% on the certificate
The result is unremarkable. What the report states alongside it is not.
Reading a certificate as a document rather than as a score
The purity figure is the least informative line on a well-constructed certificate and the only line most buyers read.
Oxidation, and the peroxide that came in with the surfactant
An isoaspartate rearrangement changes the molecule and not the mass. A method that confirms identity by molecular weight alone will report it as the parent compound.
What changed at MKM in May, and what the company says prompted it
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
Sweden health authority warns on falsified exenatide pens
Reported from the analysis, not from a warning notice.
The named comparison we promised two years ago
Duplicate submissions under different names test within-laboratory repeatability, which is a different quantity from between-laboratory reproducibility.
GGPeps 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 a 37% rise in coupling-reagent prices does to a 5 mg vial
Follow the resin, not the catalogue.
A supplier suspends shipping to the Netherlands after 5 consecutive customs detentions
The route did not close because of a rule about peptides.
Janoshik result on a Xi'an tirzepatide lot lands 1.1 points above the supplier’s stated figure
The result is unremarkable. What the report states alongside it is not.
Why summer is a documented quality problem in this trade
The route did not close because of a rule about peptides.