Quality & Testing
HPLC vs LC-MS for Research Peptides: Purity, Identity and What Each Test Actually Shows
HPLC and LC-MS are often placed side by side on peptide COAs, but they answer different analytical questions. Here is how to read them.
Peptide Purity vs Peptide Content: Why 99% HPLC Purity Does Not Mean 99% Peptide by Weight
A 99% HPLC purity result describes chromatographic composition under a method; it does not automatically mean 99% of the vial mass is target peptide.
Peptide Lot Numbers and Batch Traceability: How Researchers Verify What Is in a Vial
A COA is useful only when a laboratory can connect it to the material in hand. Lot numbers create that traceability chain.