Denmark health authority warns on falsified semaglutide pens
Reported from the analysis, not from a warning notice.
Counterfeits & mislabelling
Page 17 of 17 of this archive, newest first.
Resolving power and mass accuracy are two different specifications
Every instrument specification quoted in an advertisement is a best case obtained on a calibration mixture, not on a submitted vial.
Holograms, QR codes and other things that are not verification
Reported from the analysis, not from a warning notice.
Denmark health authority warns on falsified semaglutide pens
Reported from the analysis, not from a warning notice.
What “LC-MS: conforms” tells a reader, which is almost nothing
A short audit procedure, usable by anyone holding a certificate and a calculator.
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.
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 PeptideMeter may run electrospray where another laboratory runs MALDI
A brief and unromantic tour of the interface between a liquid sample and a vacuum.
Holograms, QR codes and other things that are not verification
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.
Why a 0.036-dalton difference is the hardest number in peptide identity
Parts per million sound impressive until they are converted into daltons at the molecular weight of the thing being measured.