Independent analysis puts a MKM liraglutide lot at 96.2%, against 94.9% on the certificate
The Journal submitted the sample and paid for the analysis. The vendor was told in advance.
Independent testing
Page 15 of 27 of this archive, newest first.
PeptideMeter result on a Hangzhou exenatide lot lands 3.5 points below the supplier’s figure
The result is unremarkable. What the report omits is not.
Five things a purity figure cannot tell you
An orthogonal method separates on a different physical principle, so that species co-eluting in the first are likely to resolve in the second. Two runs of the same method at…
Independent analysis puts a WWB exenatide lot at 98.5%, against 96.6% on the certificate
The result is unremarkable. What the report omits is not.
Medutest result on a Nantong orforglipron lot lands 2.6 points below the supplier’s figure
The report states the gradient, the wavelength and the integration threshold, which is more than most.
Independent analysis puts a GGPeps retatrutide lot at 95.3%, against 92.8% on the certificate
The result is unremarkable. What the report omits is not.
Date of analysis, date of manufacture, and the gap between them
The interval between manufacture and analysis is the most under-read figure on the page, and the one most likely to matter by the time a vial is opened.
PeptideMeter result on a Wuxi cagrilintide lot lands 2.5 points below the supplier’s figure
A reminder that a purity figure is the output of a method, and that methods differ.
The anatomy of the most reproduced page in this trade
The header identifies the batch, the table records the tests, and the footer says who is answerable. Two of the three are usually incomplete.
A number without a suitability record is a number from an unknown instrument
System suitability is the set of checks demonstrating that the instrument and method were performing adequately when your sample was injected. It is recorded as a matter of…
How a claim degrades between the bench and the listing
Lot-level verification with a public report is a real and achievable thing. It exists in this market, on a minority of listings.
A spectrum is a photograph of an ion, not of a molecule
The two ionisation techniques in general use produce different charge distributions, different adducts and different failure modes. Certificates almost never say which was…
Janoshik result on a Zhuhai liraglutide lot lands 1.0 points below the supplier’s figure
The report states the gradient, the wavelength and the integration threshold, which is more than most.
What a purity certificate is silent about
A purity figure is silent on peptide content, on water, on counter-ion, on sterility, on endotoxin and on stability. Each of those silences has a price attached.
How a claim degrades between the bench and the listing
What a verification mark would have to carry to be checkable: a date, a lot, a method, a submitter and a link to the report.
Why a dead-clean sterile filter can pass pyrogen straight through
The limit for a parenteral product is calculable from the dose and the body weight in two lines. Almost nobody in this trade performs the calculation.
Janoshik result on a Hong Kong cagrilintide lot lands 3.6 points below the supplier’s figure
The report states the gradient, the wavelength and the integration threshold, which is more than most.
PeptideMeter result on a Zhuhai mazdutide lot lands 2.7 points below the supplier’s figure
The result is unremarkable. What the report omits is not.
Independent analysis puts a CPC dulaglutide lot at 95.9%, against 94.7% on the certificate
The supplier has not disputed the finding. It has not explained the gap either.
The badge economy, and what it is actually certifying
What a verification mark would have to carry to be checkable: a date, a lot, a method, a submitter and a link to the report.