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How HPLC is used to measure research peptide purity, what a chromatogram shows and where the method has limits.
What liquid chromatography is, how its six main modes separate peptides, why reversed-phase is the default, and how each module of an HPLC system shapes a purity result.
A single purity figure underdetermines a co-formulated peptide vial. What area percent measures, why it is not the component ratio.
Analytical method validation explained: specificity, accuracy, precision, LOD and system suitability under ICH Q2(R2), and what they mean for purity.
HPLC vs UPLC: smaller particles and higher pressure give sharper peaks and faster runs. What that changes for peptide purity results, and what it doesn't.
What LC-MS is, how electrospray turns a peptide into multiply charged ions, what a mass match does and does not prove, and the three things on a certificate that LC-MS cannot answer.
Plain-English definitions of 46 research-peptide terms, from HPLC, mass spectrometry and COAs to counter-ions, net peptide content, molarity, RUO and DIN, grouped by topic.
How to read an HPLC chromatogram: retention time, peak area, baseline and purity, what impurity peaks usually mean, and red flags on a peptide COA.
How research peptides are made: solid-phase peptide synthesis step by step, why errors compound with length, where impurities come from, and what a COA can catch.
How to spot fake or underdosed research peptides in Canada: the five failure modes, COA red flags, how to verify a lab report and what to ask.
Why a 10 mg peptide vial isn't 10 mg of peptide: net peptide content, TFA vs acetate counter-ions, how they're measured and when they matter in the lab.
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