What happens to a stopper after the fourth needle
Multiple-dose vials are designed for a defined number of punctures. Nobody counts, and the elastomer does not care whether anybody counts.
Purity
Page 20 of 51 of this archive, newest first.
What twenty companies say about storage, and what they have measured
Storage instructions in this market are close to uniform and almost never accompanied by the study that would justify them. Uniformity is a sign of convention, not of…
Independent analysis puts a GL Biochem liraglutide lot at 96.0%, against 93.9% on the certificate
A reminder that a purity figure is the output of a method, and that methods differ.
Holograms, QR codes and other things that are not verification
Reported from the analysis, not from a warning notice.
Sterility is not a percentage, which is the whole difficulty
Every certificate circulating in this market answers a question about molecules. Almost none answers a question about organisms, pyrogens, or the integrity of the seal.
The named comparison we promised two years ago
The Journal submitted split samples from single lots to three assay services, under names unconnected to this publication, and published each method alongside each result.
What changed at GL Biochem in July, and what the company says prompted it
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
Holograms, QR codes and other things that are not verification
Reported from the analysis, not from a warning notice.
Custody, condition and the temperature nobody logged
The condition on arrival is recorded by some services and not others, and it is one of the more informative lines in a report.
LAL, kinetic chromogenic, recombinant factor C: three ways to the same figure
We submitted vials for endotoxin determination and report the results, the method and the laboratory, because a pyrogen figure without a method is as empty as a purity…
Medutest result on a Qingdao orforglipron lot lands 0.8 points above the supplier’s stated figure
A reminder that a purity figure is the output of a method, and that methods differ.
What column temperature does to selectivity
A shallow gradient resolves impurities that a steep one runs into the parent peak. Both methods are legitimate; only one of them can see the small stuff.
The badge is about a sample. The listing is about a product.
A badge asserts that something was tested. It does not assert what, when, on whose sample, by what method, or whether the lot on sale is the lot that was tested.
PeptideMeter result on a Wuxi mazdutide lot lands 2.1 points above the supplier’s stated figure
The supplier confirmed the determination and supplied the method behind its own figure inside a week.
QST 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 laboratory knows about the material it receives
A result on one vial generalises to a batch only if the vial was drawn in a way that makes it representative — and nobody records how it was drawn.
QYB names the synthesis and fill sites behind its catalogue
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
ERP names the synthesis and fill sites behind its catalogue
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
Independent analysis puts a JEEP orforglipron lot at 95.5%, against 92.7% on the certificate
A reminder that a purity figure is the output of a method, and that methods differ.
PeptideMeter result on a Qingdao cagrilintide lot lands 1.4 points above the supplier’s stated figure
A reminder that a purity figure is the output of a method, and that methods differ.