Understanding HPLC purity testing, mass spectrometry verification, and quality standards for research-grade peptides.
What Is HPLC?
High-Performance Liquid Chromatography (HPLC) is the gold standard analytical technique for assessing peptide purity. It separates peptide mixtures based on their physicochemical properties, allowing quantification of the target peptide versus impurities.
Purity Grades
- >99% HPLC: Research grade, suitable for most in vitro and in vivo studies
- >98% HPLC: Standard research grade
- >95% HPLC: Acceptable for preliminary screening
- <95% HPLC: Generally unsuitable for rigorous research
Mass Spectrometry Verification
HPLC alone does not confirm molecular identity. Mass spectrometry (MS) is used alongside HPLC to verify that the molecular weight of the peptide matches the expected value. Common techniques include ESI-MS and MALDI-TOF.
Third-Party Testing
Reputable peptide suppliers provide Certificates of Analysis (COA) from independent third-party laboratories. These should include HPLC chromatograms and MS data for each batch.
Research Disclaimer
This article is compiled from peer-reviewed research and publicly available scientific literature. It is intended for educational and informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before making health-related decisions.