One vial, four weeks, and the data that does not exist
Every degradation pathway accelerates by orders of magnitude on reconstitution, because the solvent that lyophilisation removed is the reagent most of them need.
Analytics
Page 17 of 25 of this archive, newest first.
Page 17
VendorInvestigate result on a Chengdu cagrilintide lot lands 3.1 points below the supplier’s figure
A reminder that a purity figure is the output of a method, and that methods differ.
How far back does this document actually reach?
What happens to traceability when bulk material is subdivided, repackaged and relabelled two or three times before sale.
LAL, kinetic chromogenic, recombinant factor C: three ways to the same figure
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 Xianning semaglutide lot lands 4.3 points below the supplier’s figure
The supplier has not disputed the finding. It has not explained the gap either.
Independent analysis puts a BCH mazdutide lot at 95.5%, against 94.0% on the certificate
The report states the gradient, the wavelength and the integration threshold, which is more than most.
The retest date and the expiry date are not the same document
What would make a difference is not a regulator. It is three lines on a certificate, all of which are already known to whoever wrote it.
Independent analysis puts a TFC semaglutide lot at 99.0%, against 96.3% on the certificate
The result is unremarkable. What the report omits is not.
Independent analysis puts a SGN mazdutide lot at 99.2%, against 96.3% on the certificate
The report states the gradient, the wavelength and the integration threshold, which is more than most.
Medutest result on a Xi'an tirzepatide lot lands 2.1 points below the supplier’s figure
The Journal submitted the sample and paid for the analysis. The vendor was told in advance.
Deamidation, oxidation, and the two shifts worth memorising
Deamidation adds 0.98 daltons. On a low-resolution instrument at incretin molecular weights, that is inside the noise.
VendorInvestigate result on a Guangzhou retatrutide lot lands 3.9 points below the supplier’s figure
The result is unremarkable. What the report omits is not.
Twenty-eight days is a number from somebody else’s product
Bacteriostatic water contains benzyl alcohol at 0.9 per cent, which inhibits microbial growth in a preserved multiple-dose presentation. It does not sterilise a contaminated…
The reviewer, the approver, and why regulated documents carry two names
What the Journal asks when a document arrives unsigned, and what the answers have been.
VendorInvestigate result on a Nantong cagrilintide lot lands 4.4 points below the supplier’s figure
The report states the gradient, the wavelength and the integration threshold, which is more than most.
The conservative convention: report the lower of two numbers
Aggregates dissociate in the mobile phase and are recorded as monomer. Only a size-based separation reports them.
Independent analysis puts a Homopeptide tirzepatide lot at 99.3%, against 95.3% on the certificate
The result is unremarkable. What the report omits is not.
Resolving power and mass accuracy are two different specifications
Calibration drift is real, unremarkable, and the reason serious laboratories run internal standards.
Independent analysis puts a SGN exenatide lot at 96.4%, against 94.7% on the certificate
The report states the gradient, the wavelength and the integration threshold, which is more than most.
Repackaging, subdivision, and the batch number that changed hands
A document is only as good as the chain that connects it to the material, and most chains here are two or three links longer than the paperwork admits.