Comprehensive peptide analysis is essential for ensuring product quality and supporting regulatory submissions. Key analytical techniques include HPLC for purity assessment, mass spectrometry for molecular weight confirmation, and enantiomeric analysis for chiral purity.
HPLC is the primary technique for assessing peptide purity. Reversed-phase HPLC separates peptides based on hydrophobicity, with the target peptide appearing as a peak in the chromatogram. The area under the peak relative to total peak area represents the purity. HPLC also provides information about the impurity profile, which is important for understanding product quality.
Mass spectrometry confirms peptide identity by measuring molecular weight. The mass spectrum should show a peak corresponding to the expected molecular weight of the peptide. For modified peptides, the mass spectrum should also show the expected mass shifts corresponding to modifications. Mass spectrometry can also provide information about impurities and degradation products.
Enantiomeric analysis is important for peptides containing chiral amino acids. Chiral HPLC or capillary electrophoresis can separate enantiomers, enabling assessment of chiral purity. This is particularly important for peptides containing D-amino acids or other non-natural amino acids, where enantiomeric purity can affect activity and safety.
Additional analytical techniques for peptide characterization include amino acid analysis (for sequence verification), peptide mapping (for structure confirmation), and bioassays (for activity assessment). At PeptideHub, our analytical lab is equipped with advanced instrumentation, ensuring complete characterization and batch-to-batch consistency.