Analytical Methods · 5 min read

HPLC Explained: The Standard for Peptide Purity Analysis

High Performance Liquid Chromatography (HPLC) is an analytical separation technique designed to resolve, identify, and quantify individual components in a complex mixture. In peptide science, HPLC serves as the benchmark method for evaluating purity, with results typically reported as a percentage of total chromatographic peak area attributable to the target compound.

HPLC achieves separation by exploiting differential affinities between analytes, a flowing liquid mobile phase, and a packed-column stationary phase. The dissolved sample is injected into the mobile phase stream and driven through the column, where individual components interact with the stationary phase to varying degrees and emerge at distinct retention times.

Reversed-phase HPLC (RP-HPLC) is the dominant mode employed in peptide analysis. The column stationary phase comprises hydrophobic alkyl chains (C8 or C18) bonded to silica particles, while the mobile phase consists of an aqueous-organic gradient, most commonly water and acetonitrile supplemented with 0.1% trifluoroacetic acid (TFA) as an ion-pairing reagent.

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