HPLC chromatograms are interpreted by examining peak position, peak shape, and peak area in relation to the method conditions and reference data. For research peptides, the main goal is usually to assess whether the expected compound is present and whether closely related impurities are also detected.
Key points to review
- Retention time: Compare the sample peak to the reference standard or validated method window.
- Peak purity: A single dominant peak may suggest a cleaner sample, while shoulders or extra peaks can indicate related species or impurities.
- Peak area: This is used for relative quantification and purity estimates, depending on the method.
- Baseline and integration: Poor baseline stability or inconsistent integration can affect the reported result.
When reviewing a COA, confirm that the HPLC method, column type, mobile phase, detection wavelength, and acceptance criteria are provided. HPLC results should be interpreted alongside mass spectrometry and other QC data rather than in isolation. For laboratory research use only; not intended for human consumption.