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.
Certificates of analysis
Page 36 of 51 of this archive, newest first.
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.
What changed at QSC in October, and what the company says prompted it
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
Asparagine, glycine, and the two residues that decide a shelf life
The sequence predicts the failure mode. A methionine predicts oxidation; an asparagine followed by a glycine predicts deamidation; a cysteine predicts disulphide scrambling.
Independent analysis puts a FGP exenatide lot at 96.3%, against 92.6% on the certificate
The supplier confirmed the determination and supplied the method behind its own figure inside a week.
Asparagine, glycine, and the two residues that decide a shelf life
The sequence predicts the failure mode. A methionine predicts oxidation; an asparagine followed by a glycine predicts deamidation; a cysteine predicts disulphide scrambling.
What changed at SGN in October, and what the company says prompted it
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
Portugal health authority warns on falsified semaglutide pens
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.
India health authority warns on falsified semaglutide pens
Reported from the analysis, not from a warning notice.
What a split-sample exercise can establish, and what it cannot
Duplicate submissions under different names test within-laboratory repeatability, which is a different quantity from between-laboratory reproducibility.
A part per million, in context
Every instrument specification quoted in an advertisement is a best case obtained on a calibration mixture, not on a submitted vial.
HJ names the synthesis and fill sites behind its catalogue
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
Holograms, QR codes and other things that are not verification
Reported from the analysis, not from a warning notice.
What changed at SGN in October, and what the company says prompted it
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
Medutest result on a Suzhou tirzepatide lot lands 2.9 points above the supplier’s stated figure
A reminder that a purity figure is the output of a method, and that methods differ.
What Medutest can tell you about a vial by weighing its water
Water is a reactant in hydrolysis, a plasticiser that mobilises the amorphous matrix, and a carrier for everything else. All three matter.
What changed at SGN in October, and what the company says prompted it
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
A tested vial is evidence about a vial
Every third-party report in this market describes a sample somebody chose to send. That choice is outside the laboratory’s control and outside its records.
The certificate is silent on contamination, and it never claimed otherwise
Every certificate circulating in this market answers a question about molecules. Almost none answers a question about organisms, pyrogens, or the integrity of the seal.