Research Library:
Analytical testing
How peptide purity and identity are measured and reported: HPLC, mass spectrometry, what a result means and the ways a purity figure gets misread. Written for researchers who want to check a report rather than take it on trust.
- ExplainerEndotoxin and LAL testing for research peptides: what an EU/mg figure on a certificate means, and when it is missingWhat bacterial endotoxin is, how LAL and recombinant factor C assays report it in EU/mg under USP <85> and <86>, why limits vary, and how to read the COA line.November 2, 202613 min read
- GuideCommon Misreadings of Peptide Purity ReportsNine common ways a peptide purity report gets misread, from reading HPLC area % as content by weight to trusting a number with no chromatogram.October 24, 20267 min read
- ExplainerHPLC and Mass Spectrometry: How Peptide Purity and Identity Are TestedA plain-language explainer of the two core analytical methods behind a peptide COA: what HPLC purity measures, what mass spectrometry confirms, and what neither can tell you on its own.September 27, 20266 min read