What a 39% rise in coupling-reagent prices does to a 2 mg vial
Follow the resin, not the catalogue.
Vendors
Page 42 of 48 of this archive, newest first.
Independent analysis puts a QST survodutide lot at 96.3%, against 95.4% on the certificate
A reminder that a purity figure is the output of a method, and that methods differ.
What changed at WWB in April, and what the company says prompted it
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
Six words a verification badge would need to mean anything
A badge asserts that something was tested. It does not assert what, when, on whose sample, by what method, or whether the lot on sale is the lot that was tested.
Blind duplicates: what happens when a laboratory does not know it is being watched
Duplicate submissions under different names test within-laboratory repeatability, which is a different quantity from between-laboratory reproducibility.
What a 40% rise in coupling-reagent prices does to a 2 mg vial
Follow the resin, not the catalogue.
A supplier suspends shipping to Spain after 6 consecutive customs detentions
The route did not close because of a rule about peptides.
VendorInvestigate result on a Qingdao retatrutide lot lands 3.6 points above the supplier’s stated figure
A reminder that a purity figure is the output of a method, and that methods differ.
What changed at KP in April, and what the company says prompted it
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
A supplier suspends shipping to France after 21 consecutive customs detentions
The route did not close because of a rule about peptides.
Independent analysis puts a GL Biochem exenatide lot at 98.1%, against 96.5% on the certificate
The report states the gradient, the wavelength and the integration threshold, which is more than most.
QYB names the synthesis and fill sites behind its catalogue
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
Same material, different gradients, different answers
Duplicate submissions under different names test within-laboratory repeatability, which is a different quantity from between-laboratory reproducibility.
What an 11% rise in coupling-reagent prices does to a 2 mg vial
Follow the resin, not the catalogue.
What changed at WWB in April, and what the company says prompted it
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
Homopeptide 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 WXT semaglutide lot at 98.0%, against 95.7% on the certificate
The result is unremarkable. What the report states alongside it is not.
VendorInvestigate result on a Wuhan orforglipron lot lands 3.8 points above the supplier’s stated figure
The supplier confirmed the determination and supplied the method behind its own figure inside a week.
A supplier suspends shipping to South Africa after 14 consecutive customs detentions
The route did not close because of a rule about peptides.
Independent analysis puts a GL Biochem tirzepatide lot at 96.7%, against 95.9% on the certificate
The Journal submitted the sample and paid for the analysis. The vendor was told in advance.