peptide purity
3 articles tagged with ‘peptide purity’
Peptide Purity Testing: Why 99% Differs on a Tripeptide and a 44-mer
At 99% per coupling a tripeptide comes off the resin 98% correct and a 44-residue chain comes off at 65%. What had to be removed, why deletion sequences are the hardest impurity to separate, and the trifluoroacetate counterion that is in the vial and not on the paperwork.
How to Verify a Peptide in Canada
A vial is the end of a chain that runs from a synthesis lot to the note you write when the parcel arrives. Where each link sits, what proves it, how each one breaks in this market, and why a purity percentage cannot answer the quantity question.
How to Read a Certificate of Analysis (COA): The Complete Guide for Peptide Researchers
A working guide to interpreting every section of a peptide Certificate of Analysis, from HPLC chromatograms and mass spec data to spotting the red flags that separate credible documentation from recycled paperwork.
