Why a result on one vial says less than the trade needs it to
What a laboratory can and cannot know about the provenance, storage history and representativeness of what lands on its bench.
Independent testing
Page 26 of 27 of this archive, newest first.
When a template becomes a misrepresentation
A blank certificate with the numbers left editable is an ordinary internal document. Its circulation as a finished record is the problem.
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.
The submitted sample: the weakest link in the whole system
What a laboratory can and cannot know about the provenance, storage history and representativeness of what lands on its bench.
The batch number is the only thing connecting the page to the vial
What happens to traceability when bulk material is subdivided, repackaged and relabelled two or three times before sale.
What column temperature does to selectivity
Column chemistry, particle size and pore diameter determine what the separation is capable of before the gradient is even programmed.
Independent analysis puts a SSA exenatide lot at 97.3%, against 93.3% on the certificate
The supplier has not disputed the finding. It has not explained the gap either.
Specification and result are two columns, and only one of them is a measurement
Statements of conformity are supposed to rest on a stated decision rule. Almost nothing in this trade states one.
Janoshik result on a Qingdao dulaglutide lot lands 3.9 points below the supplier’s figure
The supplier has not disputed the finding. It has not explained the gap either.
Accuracy, precision and the tolerance nobody states
Every instrument specification quoted in an advertisement is a best case obtained on a calibration mixture, not on a submitted vial.
What “LC-MS: conforms” tells a reader, which is almost nothing
None of what a checkable identity statement requires is commercially sensitive, and all of it is known to whoever produced the document.
Independent analysis puts a SSA semaglutide lot at 98.0%, against 94.0% on the certificate
The supplier has not disputed the finding. It has not explained the gap either.
Independent analysis puts a MKM survodutide lot at 97.0%, against 95.7% on the certificate
The result is unremarkable. What the report omits is not.
The impurity hiding underneath the parent peak
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…
Six words a verification badge would need to mean anything
Lot-level verification with a public report is a real and achievable thing. It exists in this market, on a minority of listings.
Mass spectrometry answers a different question, properly
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.
Independent analysis puts a BCH tirzepatide lot at 98.3%, against 94.9% on the certificate
The report states the gradient, the wavelength and the integration threshold, which is more than most.
A named analyst is the cheapest quality signal in this trade
What the Journal asks when a document arrives unsigned, and what the answers have been.
Retest date, expiry date, and the two conventions being confused
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.
Deamidation, oxidation, and the two shifts worth memorising
What would be needed to catch each of these, and what it would cost.