Size exclusion sees the thing reversed-phase dissolved
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.
Certificates of analysis
Page 15 of 51 of this archive, newest first.
Janoshik result on a Chengdu orforglipron lot lands 3.8 points below the supplier’s figure
The supplier has not disputed the finding. It has not explained the gap either.
What we asked twenty suppliers about stability data
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…
Holograms, QR codes and other things that are not verification
Reported from the analysis, not from a warning notice.
How to check a certificate in ten minutes
What each missing test would cost to add, and which of them a buyer should actually want.
Sweden health authority warns on falsified liraglutide pens
Reported from the analysis, not from a warning notice.
QST declines, for the 17th time, to name its synthesis house
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
What changed at SGN in October, and what the company will not say about it
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
Medutest result on a Qingdao dulaglutide lot lands 1.4 points below the supplier’s figure
The Journal submitted the sample and paid for the analysis. The vendor was told in advance.
Independent analysis puts a KP semaglutide lot at 95.6%, against 94.1% on the certificate
The Journal submitted the sample and paid for the analysis. The vendor was told in advance.
What changed at QST in October, and what the company will not say about it
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
PeptideMeter result on a Wuhan orforglipron lot lands 2.1 points below the supplier’s figure
The result is unremarkable. What the report omits is not.
How a claim degrades between the bench and the listing
The Journal does not treat a badge as evidence and states so wherever it reports one.
Homopeptide declines, for the 24th 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 tirzepatide lot at 95.4%, against 92.1% on the certificate
A reminder that a purity figure is the output of a method, and that methods differ.
Norway health authority warns on falsified semaglutide pens
Reported from the analysis, not from a warning notice.
Leucine, isoleucine, and a difference no balance can measure
Deamidation adds 0.98 daltons. On a low-resolution instrument at incretin molecular weights, that is inside the noise.
Holograms, QR codes and other things that are not verification
Reported from the analysis, not from a warning notice.
Six words a verification badge would need to mean anything
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.
Independent analysis puts a HJ dulaglutide lot at 95.0%, against 93.3% on the certificate
A reminder that a purity figure is the output of a method, and that methods differ.