Glossary

HPLC (High-Performance Liquid Chromatography)

Analytical

HPLC (High-Performance Liquid Chromatography) — An analytical separation technique used to identify, quantify, and purify components in a mixture. The gold standard for determining peptide purity.

What Is HPLC?

HPLC (High-Performance Liquid Chromatography) is an analytical separation technique that pumps a liquid mobile phase at high pressure through a column packed with stationary phase particles. It is the gold standard method for determining peptide purity and is cited on every Certificate of Analysis issued by Peptera Research.

In peptide analysis, reversed-phase HPLC (RP-HPLC) using C18 columns is the most common configuration, separating compounds based on hydrophobicity differences between the target peptide and its impurities.

How RP-HPLC Works for Peptides

A peptide sample dissolved in aqueous solvent is injected onto a C18 column. A gradient of increasing organic solvent (typically acetonitrile with 0.1% TFA) is pumped through the column. Peptides elute at characteristic retention times based on their hydrophobicity. A UV detector at 214nm (peptide bond absorption) or 280nm (aromatic residues) records the chromatogram.

Purity is calculated as the area of the main peptide peak divided by the total area of all peaks, expressed as a percentage. Peptera Research requires minimum 98% purity by this method.

Reading an HPLC Certificate

Retention time: When the peptide elutes. Should be consistent between batches for the same compound
Peak shape: A single sharp, symmetric peak indicates high purity. Shoulders or split peaks suggest impurities or conformational heterogeneity
Purity percentage: Area under the main peak vs. total area. Must be ≥98% for research-grade peptides
Baseline: A flat baseline before and after the main peak confirms clean separation

Limitations

HPLC measures chromatographic purity but cannot confirm molecular identity. A peptide may show 99% purity by HPLC while being the wrong sequence entirely. This is why mass spectrometry confirmation is required alongside HPLC on every Certificate of Analysis.

Frequently Asked Questions

What is HPLC (High-Performance Liquid Chromatography)?

An analytical separation technique used to identify, quantify, and purify components in a mixture. The gold standard for determining peptide purity.

Why is HPLC (High-Performance Liquid Chromatography) important in peptide research?

HPLC (High-Performance Liquid Chromatography) is a fundamental concept in analytical as it relates to peptide science. It directly influences experimental design, compound characterization, and the reliability of research outcomes across biochemistry and molecular biology disciplines.

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