Independent analysis puts a QST dulaglutide lot at 95.3%, against 91.7% on the certificate
The result is unremarkable. What the report omits is not.
Analytics
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Independent analysis puts a TFC dulaglutide lot at 95.8%, against 95.1% 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
A stability programme needs a protocol, defined conditions, a stability-indicating method and time. Time is the ingredient no commercial testing service can sell.
The shelf life ends when the diluent goes in
At low concentrations a measurable fraction of peptide can adsorb to glass and plastic surfaces, and the loss is largest exactly where it is least expected.
Independent analysis puts a ERP survodutide lot at 95.6%, against 92.3% on the certificate
A reminder that a purity figure is the output of a method, and that methods differ.
Janoshik result on a Shenzhen liraglutide lot lands 1.2 points below the supplier’s figure
The result is unremarkable. What the report omits is not.
Independent analysis puts a FGP exenatide lot at 96.3%, against 92.6% on the certificate
The supplier has not disputed the finding. It has not explained the gap either.
PeptideMeter result on a Guangzhou liraglutide lot lands 3.3 points below the supplier’s figure
The Journal submitted the sample and paid for the analysis. The vendor was told in advance.
How a release document is put together in a regulated plant
The header identifies the batch, the table records the tests, and the footer says who is answerable. Two of the three are usually incomplete.
The badge economy, and what it is actually certifying
Every step between the laboratory report and the product page removes information, and the badge is the last step.
Medutest result on a Suzhou tirzepatide lot lands 2.9 points below the supplier’s figure
A reminder that a purity figure is the output of a method, and that methods differ.
D-amino acids are invisible to mass spectrometry, and that is the whole problem
Stereochemical inversion changes the molecule, changes its biology, and changes its mass by exactly nothing.
Medutest result on a Xi'an semaglutide lot lands 3.3 points below the supplier’s figure
The supplier has not disputed the finding. It has not explained the gap either.
Six words a verification badge would need to mean anything
Every step between the laboratory report and the product page removes information, and the badge is the last step.
Repackaging, subdivision, and the batch number that changed hands
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.
Independent analysis puts a TFC tirzepatide lot at 97.7%, against 95.0% on the certificate
The report states the gradient, the wavelength and the integration threshold, which is more than most.
Independent analysis puts a WXT tirzepatide lot at 96.4%, against 93.6% on the certificate
The report states the gradient, the wavelength and the integration threshold, which is more than most.
Custody, condition and the temperature nobody logged
A result on one vial generalises to a batch only if the vial was drawn in a way that makes it representative — and nobody records how it was drawn.
VendorInvestigate result on a Wuxi semaglutide lot lands 2.1 points below the supplier’s figure
The supplier has not disputed the finding. It has not explained the gap either.
Janoshik result on a Wuxi survodutide lot lands 2.9 points below the supplier’s figure
The supplier has not disputed the finding. It has not explained the gap either.