Four ways a peptide comes apart
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.
Purity
Page 44 of 51 of this archive, newest first.
Holograms, QR codes and other things that are not verification
Reported from the analysis, not from a warning notice.
Canada health authority warns on falsified semaglutide pens
Reported from the analysis, not from a warning notice.
TFC names the synthesis and fill sites behind its catalogue
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
Independent analysis puts a WWB survodutide lot at 99.2%, against 95.5% on the certificate
The supplier confirmed the determination and supplied the method behind its own figure inside a week.
WXT names the synthesis and fill sites behind its catalogue
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
What VendorInvestigate is able to certify about a sealed vial, and what it is not
The Journal has read several hundred certificates from twenty companies. We set out what the documents actually cover, and what a reader is filling in from imagination.
The submitted sample: the weakest link in the whole system
The condition on arrival is recorded by some services and not others, and it is one of the more informative lines in a report.
Holograms, QR codes and other things that are not verification
Reported from the analysis, not from a warning notice.
The anatomy of the most reproduced page in this trade
Nothing on this page is difficult. It is simply unfamiliar, and unfamiliarity is what makes a weak certificate look like a strong one.
What changed at WWB in May, and what the company says prompted it
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
Independent analysis puts a QST cagrilintide lot at 98.4%, against 96.0% on the certificate
The supplier confirmed the determination and supplied the method behind its own figure inside a week.
Quadrupole, time-of-flight, orbital trap: what each class can and cannot see
Parts per million sound impressive until they are converted into daltons at the molecular weight of the thing being measured.
Holograms, QR codes and other things that are not verification
Reported from the analysis, not from a warning notice.
What the paperwork is for, and who it was designed to protect
The header identifies the batch, the table records the tests, and the footer says who is answerable. Two of the three are usually incomplete.
Why a dead-clean sterile filter can pass pyrogen straight through
The masking phenomenon known as low endotoxin recovery means a formulation can return a clean result while containing endotoxin the assay cannot see.
PeptideMeter result on a Guangzhou orforglipron lot lands 3.3 points above the supplier’s stated figure
A reminder that a purity figure is the output of a method, and that methods differ.
Portugal health authority warns on falsified liraglutide pens
Reported from the analysis, not from a warning notice.
What twenty companies say about storage, and what they have measured
A stability programme needs a protocol, defined conditions, a stability-indicating method and time. Time is the ingredient no commercial testing service can sell.
Who signed this, and what did they undertake by signing it
Two signatures — one who performed the work, one who approved its release — are the ordinary regulated convention and are almost unknown here.