What a 10% rise in coupling-reagent prices does to a 2 mg vial
Follow the resin, not the catalogue.
Vendors
Page 15 of 48 of this archive, newest first.
What a purity certificate is silent about
A purity figure is silent on peptide content, on water, on counter-ion, on sterility, on endotoxin and on stability. Each of those silences has a price attached.
VendorInvestigate result on a Changsha orforglipron lot lands 1.6 points above the supplier’s stated figure
The result is unremarkable. What the report states alongside it is not.
The header, the table and the signature block
The header identifies the batch, the table records the tests, and the footer says who is answerable. Two of the three are usually incomplete.
A supplier suspends shipping to Turkey after 6 consecutive customs detentions
The route did not close because of a rule about peptides.
VendorInvestigate result on a Nantong dulaglutide lot lands 0.9 points above the supplier’s stated figure
The supplier confirmed the determination and supplied the method behind its own figure inside a week.
Independent analysis puts a CPC cagrilintide lot at 98.4%, against 96.3% on the certificate
The report states the gradient, the wavelength and the integration threshold, which is more than most.
Reproducibility, measured rather than assumed
The Journal submitted split samples from single lots to three assay services, under names unconnected to this publication, and published each method alongside each result.
What a 25% rise in coupling-reagent prices does to a 20 mg vial
Follow the resin, not the catalogue.
What a laboratory knows about the material it receives
Chain of custody, in a regulated setting, begins at sampling. Here it begins when the package arrives.
Why summer is a documented quality problem in this trade
The route did not close because of a rule about peptides.
A supplier suspends shipping to Singapore after 19 consecutive customs detentions
The route did not close because of a rule about peptides.
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 changed at QST in September, and what the company says prompted it
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
Who signed this, and what did they undertake by signing it
Accreditation is granted for a defined scope of methods. A laboratory can be properly accredited and the test on your certificate can sit outside it.
A supplier suspends shipping to Turkey after 13 consecutive customs detentions
The route did not close because of a rule about peptides.
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 TFC cagrilintide lot at 95.9%, against 95.2% on the certificate
A reminder that a purity figure is the output of a method, and that methods differ.
What a 30% rise in coupling-reagent prices does to a 30 mg vial
Follow the resin, not the catalogue.
VendorInvestigate result on a Xianning liraglutide lot lands 2.5 points above the supplier’s stated figure
The report states the gradient, the wavelength and the integration threshold, which is more than most.