{"id":1701,"date":"2026-05-31T19:33:53","date_gmt":"2026-05-31T19:33:53","guid":{"rendered":"https:\/\/one-peptides.com\/hplc-vs-ms-methods-for-analyzing-research-peptide-purity\/"},"modified":"2026-10-04T10:27:53","modified_gmt":"2026-10-04T10:27:53","slug":"hplc-vs-ms-methods-for-analyzing-research-peptide-purity","status":"publish","type":"post","link":"https:\/\/one-peptides.com\/es\/hplc-vs-ms-methods-for-analyzing-research-peptide-purity\/","title":{"rendered":"HPLC vs MS – methods for analyzing the purity of research peptides"},"content":{"rendered":"
\n\tHome<\/a>\n<\/span>\u00bb<\/span>\n\tQuality & safety<\/a>\n<\/span>\u00bb<\/span>\n\tHPLC vs MS \u2013 methods for analyzing the purity of research peptides\n<\/span><\/div><\/div>\n

In a laboratory working with peptides, there comes a moment when the supplier sends a certificate of analysis with two key data: an HPLC chromatogram with the declaration “purity \u226598%” and a mass spectrum with the molecular mass consistent with the theoretical value. To a person without a background in analytical chemistry, both documents look like a technical formality – a strip of peaks, a few numbers, the signature of a QC employee. For the research team planning an experiment, the values of these two documents are the foundation for everything that happens next. Without them, the peptide is simply a white powder of unknown identity and purity.<\/p>\n

High performance liquid chromatography (HPLC<\/strong>) and mass spectrometry (MS<\/strong>) are two basic analytical techniques used in research peptidology. They both answer different questions. Both are essential. Understanding, what exactly does each technique verify?<\/strong> – and which none of them verifies on their own – is the first element of the scientific workshop when working with peptides. You can find more context on quality standards and supplier ratings in the overview article how to recognize high-quality research peptides<\/a>.<\/p>\n

This article compares both methods from the perspective of a researcher receiving a peptide from a supplier: what to read in the chromatogram, what to read in the mass spectrum, how to interpret the results together, and when additional analytical techniques are needed.<\/p>\n

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\ud83d\udcd6 The following article is educational and describes the principles of research peptide analysis in the context of assessing the quality of reagents (Research Use Only). It does not constitute technical advice on specific laboratory protocols – consult your peptide supplier’s QC team for advanced analyses.<\/p>\n<\/blockquote>\n

What is HPLC – the foundation of purity determination<\/h2>\n

High performance liquid chromatography (High-Performance Liquid Chromatography<\/strong>, HPLC) is a separation technique in which a mixture of substances dissolved in the liquid phase passes through a column filled with a sorbent. Different substances are retained in the column with different forces – as a result, they leave the column at different times. The detector records the flow of individual fractions, generating chromatogram<\/strong>.<\/p>\n

It is standard in peptology Reverse phase HPLC<\/strong> (Reversed-Phase HPLC, RP-HPLC).<\/p>\n

Mechanism of reversed phase separation<\/h3>\n

In RP-HPLC, the chromatographic column is filled with a hydrophobic sorbent – most often silica gel modified with 18-carbon aliphatic chains<\/strong> (column C18). The mobile phase is a mixture of:<\/p>\n