VendorInvestigate result on a Tianjin tirzepatide lot lands 0.7 points below the supplier’s figure
The report states the gradient, the wavelength and the integration threshold, which is more than most.
Analytics in 2024
Page 5 of 10 of this archive, newest first.
PeptideMeter result on a Suzhou retatrutide lot lands 2.2 points below the supplier’s figure
A reminder that a purity figure is the output of a method, and that methods differ.
Twenty-eight days is a number from somebody else’s product
We set out what is known, what is inferred and what is simply assumed about the fortnight after a vial is opened.
A named analyst is the cheapest quality signal in this trade
What the Journal asks when a document arrives unsigned, and what the answers have been.
Independent analysis puts a SWB orforglipron lot at 97.7%, against 94.2% on the certificate
The report states the gradient, the wavelength and the integration threshold, which is more than most.
Medutest result on a Shenzhen tirzepatide lot lands 1.0 points below the supplier’s figure
The supplier has not disputed the finding. It has not explained the gap either.
Turnaround, cost and accreditation across the services this trade relies on
A compendial sterility test takes fourteen days of incubation and consumes the containers tested. That timescale is incompatible with the business model that made…
Medutest result on a Wuhan mazdutide lot lands 3.6 points below the supplier’s figure
The Journal submitted the sample and paid for the analysis. The vendor was told in advance.
Independent analysis puts a MKM retatrutide lot at 95.5%, against 92.8% on the certificate
The supplier has not disputed the finding. It has not explained the gap either.
Independent analysis puts a GL Biochem tirzepatide lot at 99.2%, against 95.8% on the certificate
The report states the gradient, the wavelength and the integration threshold, which is more than most.
Pore size, particle size, and why peptides need the wide pores
A shallow gradient resolves impurities that a steep one runs into the parent peak. Both methods are legitimate; only one of them can see the small stuff.
Independent analysis puts a SSA orforglipron lot at 95.7%, against 92.2% on the certificate
The Journal submitted the sample and paid for the analysis. The vendor was told in advance.
The fourteen-day problem, and what it does to a commercial testing model
Endotoxin is the more tractable of the two questions, and a kinetic chromogenic determination is neither slow nor exotic. It is simply not on the menu.
PeptideMeter result on a Shenzhen semaglutide lot lands 1.9 points below the supplier’s figure
The supplier has not disputed the finding. It has not explained the gap either.
Independent analysis puts a QYB mazdutide lot at 95.1%, against 91.4% on the certificate
A reminder that a purity figure is the output of a method, and that methods differ.
From vial to bench: what is recorded and what is assumed
The condition on arrival is recorded by some services and not others, and it is one of the more informative lines in a report.
Check the vial, not the box
The interval between manufacture and analysis is the most under-read figure on the page, and the one most likely to matter by the time a vial is opened.
Independent analysis puts a ERP cagrilintide lot at 95.3%, against 91.4% on the certificate
The result is unremarkable. What the report omits is not.
Benzyl alcohol is a preservative, not a sterilising agent
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.
VendorInvestigate result on a Shenzhen dulaglutide lot lands 1.9 points below the supplier’s figure
The supplier has not disputed the finding. It has not explained the gap either.