Hydrolysis, isomerisation, and the arithmetic of a broken bond
An isoaspartate rearrangement changes the molecule and not the mass. A method that confirms identity by molecular weight alone will report it as the parent compound.
Recent work
258 piecesA supplier suspends shipping to the United Arab Emirates after 24 consecutive customs detentions
The route did not close because of a rule about peptides.
A supplier suspends shipping to Spain after 13 consecutive customs detentions
The route did not close because of a rule about peptides.
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.
New Zealand declines to reimburse liraglutide outside a specialist service
Efficacy was never the question in this appraisal. Duration of treatment was.
A supplier suspends shipping to Australia after 11 consecutive customs detentions
The route did not close because of a rule about peptides.
A supplier suspends shipping to Canada after 9 consecutive customs detentions
The route did not close because of a rule about peptides.
Singapore declines to reimburse exenatide outside a specialist service
Efficacy was never the question in this appraisal. Duration of treatment was.
France declines to reimburse exenatide outside a specialist service
Efficacy was never the question in this appraisal. Duration of treatment was.
A supplier suspends shipping to the Netherlands after 5 consecutive customs detentions
The route did not close because of a rule about peptides.
A supplier suspends shipping to the United Kingdom after 14 consecutive customs detentions
The route did not close because of a rule about peptides.
A supplier suspends shipping to Argentina after 22 consecutive customs detentions
The route did not close because of a rule about peptides.
South Korea declines to reimburse liraglutide outside a specialist service
Efficacy was never the question in this appraisal. Duration of treatment was.
A supplier suspends shipping to Switzerland after 4 consecutive customs detentions
The route did not close because of a rule about peptides.
A supplier suspends shipping to Turkey after 4 consecutive customs detentions
The route did not close because of a rule about peptides.
Poland declines to reimburse tirzepatide outside a specialist service
Efficacy was never the question in this appraisal. Duration of treatment was.
A supplier suspends shipping to Norway after 13 consecutive customs detentions
The route did not close because of a rule about peptides.
A supplier suspends shipping to Mexico after 5 consecutive customs detentions
The route did not close because of a rule about peptides.
Ireland declines to reimburse liraglutide outside a specialist service
Efficacy was never the question in this appraisal. Duration of treatment was.
Sending the same vial twice, under two names
Two years ago we ran an anonymised version of this comparison and promised a named one. This is it, with every method printed in full.