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Sable Peptides

HPLC vs Mass Spectrometry (LC-MS) for Peptide Testing

HPLC vs Mass Spectrometry (LC-MS) for Peptide Testing is supplied for laboratory research only. Key facts are below; stored as lyophilised powder.

Last verified 12 Oct 2026.

A CoA for every lot; each vial carries a printed lot number that matches it. Ask with the lot number and we send it.

The short answer

HPLC measures purity and mass spectrometry confirms identity. LC-MS combines them, putting a mass to each chromatographic peak, which is the strongest routine check on a research peptide.

Research use only. Sable Peptides supplies laboratory reagents for in vitro and laboratory research by qualified people. Not a medicine. Not for human or veterinary use.

The short answer

HPLC measures purity and mass spectrometry confirms identity. LC-MS combines them, putting a mass to each chromatographic peak, which is the strongest routine check on a research peptide.

Side by side

| | HPLC-UV | MS | LC-MS | |---|---|---|---| | Question answered | How pure? | Is it the right molecule? | What is each peak? | | Output | Chromatogram, area % | Mass spectrum, m/z | Both, aligned | | Blind spots | Co-eluting species; identity | Quantity; isobaric species | Ion suppression; cost |

How the MS part works

Electrospray ionisation turns large, polar molecules such as peptides into multiply charged gas-phase ions (Fenn et al., 1989). The analyser measures m/z, and software reconstructs the neutral mass. High-resolution instruments resolve isotopes and can spot +1 Da (deamidation) or +16 Da (oxidation) changes (Aebersold & Mann, 2003).

How the HPLC part works

Reversed-phase separation with UV detection at 214–220 nm reports the main peak's share of the total area (Mant et al., 2007). LC-MS often uses formic acid instead of TFA, because TFA suppresses ionisation.

What a certificate should show

At minimum, the HPLC purity with its method, plus the observed and expected mass. LC-MS data, when supplied, is the stronger evidence.

- /learn/hplc-purity-explained - /learn/how-to-read-a-certificate-of-analysis

Sources

1. Fenn JB et al.. Electrospray ionization for mass spectrometry of large biomolecules. *Science* 1989;246:64-71. PMID 2675315. doi:10.1126/science.2675315 2. Aebersold R et al.. Mass spectrometry-based proteomics. *Nature* 2003;422:198-207. PMID 12634793. doi:10.1038/nature01511 3. Mant CT et al.. HPLC analysis and purification of peptides. *Methods Mol Biol* 2007;386:3-55. PMID 18604941. PMC7119934. doi:10.1007/978-1-59745-430-8_1

*Last reviewed: 2026-10-10. Original Sable content; sources verified via PubMed E-utilities / Crossref / live HTTP checks on 2026-10-10.*

Last reviewed: 2026-10-10

How much does HPLC vs Mass Spectrometry (LC-MS) for Peptide Testing cost in the UK?

Frequently asked questions

What does HPLC tell you?

How much of the UV-absorbing material is the main species: purity.

What does mass spectrometry tell you?

Whether the molecular mass matches the expected sequence: identity.

What is LC-MS?

Liquid chromatography coupled directly to a mass spectrometer, so each HPLC peak can be assigned a mass.

Why do MS spectra show several peaks for one peptide?

Electrospray ionisation produces several charge states (M+2H, M+3H and so on), which are deconvoluted to one mass.

Which test matters more?

Both. A pure wrong peptide and an impure right peptide each fail one of the two tests.