What changed at WXT in November, and what the company will not say about it
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
Certificates of analysis
Page 14 of 51 of this archive, newest first.
Mexico health authority warns on falsified semaglutide pens
Reported from the analysis, not from a warning notice.
Holograms, QR codes and other things that are not verification
Reported from the analysis, not from a warning notice.
Accreditation, scope, and the question nobody asks Medutest
A manufacturer’s certificate is a self-declaration. An accredited laboratory’s report is a third-party measurement. The trade prints both under one heading.
Independent analysis puts a FGP survodutide lot at 95.6%, against 92.9% on the certificate
The report states the gradient, the wavelength and the integration threshold, which is more than most.
PeptideMeter result on a Tianjin retatrutide lot lands 3.7 points below the supplier’s figure
A reminder that a purity figure is the output of a method, and that methods differ.
Why VendorInvestigate may run electrospray where another laboratory runs MALDI
The two ionisation techniques in general use produce different charge distributions, different adducts and different failure modes. Certificates almost never say which was…
The United Arab Emirates health authority warns on falsified liraglutide pens
Reported from the analysis, not from a warning notice.
Adsorption, and the dose that stayed on the glass
An in-use period is established by a dedicated study on a specific formulation in a specific container at a specific concentration. Borrowing one from a marketed product is…
Independent analysis puts a CPC dulaglutide lot at 96.5%, against 94.8% on the certificate
The supplier has not disputed the finding. It has not explained the gap either.
Asparagine, glycine, and the two residues that decide a shelf life
We describe each pathway in enough chemical detail to explain why it is invisible to the method the trade uses, because that is the part which has practical consequences.
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.
Why the independent testing market grew a chemistry arm and not a microbiology one
The absence of microbiological capability in this market is a commercial fact with a straightforward explanation, and it is worth understanding before blaming anybody for it.
The United Kingdom 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.
Holograms, QR codes and other things that are not verification
Reported from the analysis, not from a warning notice.
The four testing services and the study none of them can run
We asked twenty companies three questions about stability data and print every answer, refusal and non-response.
BCH 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.
GGPeps 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.
Blind duplicates: what happens when a laboratory does not know it is being watched
Duplicate submissions under different names test within-laboratory repeatability, which is a different quantity from between-laboratory reproducibility.