COA & Purity Science

Peptide photostability describes how a peptide resists chemical change when exposed to ultraviolet and visible light, and it is one

Peptide impurity thresholds for synthetic peptides are not the ICH Q3A figures most suppliers quote. ICH Q3A(R2) explicitly excludes peptides

Subvisible particulate matter is the population of undissolved particles between roughly 2 and 100 micrometres that a reconstituted peptide solution

Container closure integrity testing measures whether a sealed vial genuinely isolates its contents from the surrounding environment, and it is

Peptide reference standards are the anchor that makes a purity number mean something. A percentage on a certificate is not

Peptide sterility testing and endotoxin testing answer two completely different questions, and a certificate of analysis reporting one tells you

Peptide analytical method validation is the documented evidence that a laboratory procedure measures what it claims to measure, with the

qNMR peptide purity analysis measures how much peptide is actually present as a fraction of total sample mass, rather than

Capillary electrophoresis peptide purity analysis separates species by charge-to-size ratio rather than by hydrophobicity, which allows it to resolve impurities

Karl Fischer titration measures residual water in lyophilized research peptides. Why moisture skews net peptide content, drives solid-state degradation, and belongs on the COA.