Picture two batches of the same peptide. Both test reports, called a Certificate of Analysis (COA), show 99% purity. So
How can you know if two batches of a peptide are the same? That you can’t know from the purity
How can you tell if a peptide batch matches its label? Look at the papers, not the powder. Peptide QC
Why does a peptide pass its COA, then fail a test a few months later? It was made well most
Why does one peptide dissolve well in one lab but become cloudy in another? The synthesis is rarely wrong. “It’s
Why do two vials of the same peptide give two different test results? Both labels claim 98% purity. Buyers with
In the net peptide content vs purity both certificates say 98% purity. The same protocol gives two different EC50 values.
Two suppliers quote the same sequence. Both certificates say 98%. The assay results still do not match. Finding the purity
A clean HPLC peak is a good sign. But it shows the pure only. It doesn’t prove what the compound
