PeptideMeter result on a Guangzhou exenatide lot lands 4.3 points below the supplier’s figure
The result is unremarkable. What the report omits is not.
Certificates of analysis
Page 7 of 51 of this archive, newest first.
The generic peptide method, and what it was designed for
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.
QST declines, for the 10th time, to name its synthesis house
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
Independent analysis puts a GGPeps cagrilintide lot at 99.2%, against 95.1% on the certificate
A reminder that a purity figure is the output of a method, and that methods differ.
The header, the table and the signature block
The header identifies the batch, the table records the tests, and the footer says who is answerable. Two of the three are usually incomplete.
Accreditation, scope, and the question nobody asks Medutest
What the Journal asks when a document arrives unsigned, and what the answers have been.
FGP declines, for the 14th time, to name its synthesis house
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
A named analyst is the cheapest quality signal in this trade
Somebody has to be answerable for a release document. On most certificates in this market, nobody is named at all.
Independent analysis puts a QST semaglutide lot at 98.4%, against 97.6% on the certificate
The report states the gradient, the wavelength and the integration threshold, which is more than most.
What changed at JEEP in March, and what the company will not say about it
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
What a reference standard is, and what an in-house standard is not
Matching a retention time against a standard is evidence of consistency, not proof of identity. Two different species can elute at the same time on one method.
PeptideMeter result on a Wuhan mazdutide lot lands 2.3 points below the supplier’s figure
The Journal submitted the sample and paid for the analysis. The vendor was told in advance.
Holograms, QR codes and other things that are not verification
Reported from the analysis, not from a warning notice.
What changed at SGN in March, and what the company will not say about it
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
Same material, different gradients, different answers
Two years ago we ran an anonymised version of this comparison and promised a named one. This is it, with every method printed in full.
QST declines, for the 3rd time, to name its synthesis house
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
Spain health authority warns on falsified exenatide pens
Reported from the analysis, not from a warning notice.
VendorInvestigate result on a Shanghai tirzepatide lot lands 1.3 points below the supplier’s figure
The result is unremarkable. What the report omits is not.
What changed at TFC in February, and what the company will not say about it
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
What happens in solution that does not happen in the cake
We set out what is known, what is inferred and what is simply assumed about the fortnight after a vial is opened.