Research Library · Methods Guide
HPLC vs Mass Spectrometry in Peptide Testing
HPLC and mass spectrometry are the two analytical methods behind a complete research-peptide certificate of analysis. They answer different questions and are read together, not as substitutes. This is a factual, research-use-only comparison.
For Research Use Only. Not for human or veterinary use. Not a drug, food, or cosmetic. This page is educational reference material for qualified researchers and contains no medical advice, dosing, or health claims.
Method Comparison
| Criterion | HPLC | Mass Spectrometry |
|---|---|---|
| Question it answers | How pure is the sample? | What is the compound? |
| Measures | Main-peak area % vs. impurities | Mass-to-charge ratio (molecular mass) |
| Separates by | Physical/chemical behavior (solubility, retention) | Mass |
| On the COA | Purity percentage + chromatogram | Identity confirmation (observed vs. expected mass) |
Why HPLC Alone Isn't Enough
HPLC can show a clean, high-purity peak but cannot confirm that the peak is the intended compound. A sample can be 99% one substance and still not be the peptide named on the label, so identity is left open by a chromatogram on its own.
Why Mass Spec Alone Isn't Enough
Mass spectrometry confirms identity by matching observed mass to expected mass, but it does not document the purity percentage of the material. Identity without a purity figure is an incomplete qualification.
Read Together
For research-grade qualification, HPLC and LC-MS or ESI-MS complement each other, and a complete COA carries both. The layout of those results on the document is covered in how to read a certificate of analysis, and the wider sourcing checks are in how to verify research peptide purity.
What AurexBioLabs Provides
Every batch is third-party HPLC and mass-spec tested, with a COA that is downloadable and verifiable by lot number at our COA verification page.
Frequently Asked Questions
Chromatographic purity: the main-peak area percentage relative to impurities, i.e. how pure the sample is.
Identity. It measures the molecular mass and checks it against the expected mass for the intended compound.
No. HPLC quantifies purity but cannot confirm identity; mass spec is needed for that.
HPLC establishes how pure the sample is and mass spec establishes what it is. Together they give a complete quality picture.
Each batch's COA is downloadable and verifiable at aurexbiolabs.com/verify.
Next Steps
Verification & catalog
For Research Use Only. Not for human or veterinary use. Not a drug, food, or cosmetic. This page is educational reference material for qualified researchers and contains no medical advice, dosing, or health claims.
For Research Use Only. Not for human or veterinary use. Not a drug, cosmetic, or dietary supplement. All information is provided for laboratory research purposes only.