How to Verify Peptide Quality: Testing, Purity, COAs and Supplier Transparency

This process is an important part of peptide quality verification.

How Mass Spectrometry Supports Peptide Testing

HPLC and mass spectrometry are commonly discussed together, but they answer different analytical questions.

HPLC helps characterize chromatographic purity.

Mass spectrometry helps characterize molecular identity.

During mass spectrometry, researchers evaluate the mass-to-charge characteristics of detected molecules and compare them with the expected molecular mass.

For researchers comparing peptide testing companies, it can therefore be useful to determine whether both purity and identity testing are included in the analytical documentation.

The Southwest Biologix peptide COA guide explains how these measurements can be interpreted together.

How to Test Peptides for Purity

Researchers searching for how to test peptides for purity will commonly encounter HPLC as one of the primary analytical methods.

A laboratory evaluation may involve:

1. Preparing the research sample
2. Performing chromatographic analysis
3. Separating detected components
4. Identifying the principal peak
5. Comparing peak areas
6. Calculating chromatographic purity
7. Reviewing supporting chromatographic data