Peptide Oxidative Degradation: Metal Ion Contamination
Learn how trace copper and iron ions leached from vials and crimp seals catalyze Fenton and Haber-Weiss reactions causing oxidative degradation in reconstituted peptides.
Articles
Diketopiperazine Formation in Reconstituted Peptides
Learn how diketopiperazine (DKP) formation degrades reconstituted peptides through N-terminal cyclization, and how sequence, proline, and storage conditions affect rates.
Peptide Racemization During Storage: Causes & Prevention
Learn how reconstituted peptide racemization occurs through base-catalyzed proton abstraction, creating D-amino acid epimers that reduce potency during alkaline pH storage.
Peptide Aggregation & Amyloid Fibril Formation in Storage
Learn how reconstituted peptide aggregation and amyloid-like fibril formation occur through nucleation-dependent polymerization during storage at elevated concentrations.
Peptide Aspartate Isomerization During Storage Explained
Learn how reconstituted peptides undergo aspartate isomerization via succinimide intermediates during storage, forming isoaspartate and D-aspartate backbone isomers.
Peptide Beta-Elimination: Serine & Threonine Degradation
Learn how reconstituted peptides undergo serine and threonine beta-elimination at alkaline pH, forming dehydroalanine crosslinks that compromise peptide stability during storage.
2-Oxohistidine Formation in Peptides via Metal-Catalyzed Oxidation
Learn how histidine residues in reconstituted peptides undergo metal-catalyzed Fenton oxidation to form 2-oxohistidine, a +16 Da degradation product during storage.
Methionine Sulfoxidation in Reconstituted Peptides
Learn how methionine sulfoxidation occurs in reconstituted peptides through ROS-mediated oxidation, generating +16 Da diastereomeric sulfoxide products during storage.
Peptide Transglutamination & Isopeptide Crosslinking
Learn how reconstituted peptides undergo non-enzymatic transglutamination forming isopeptide crosslinks between glutamine and lysine residues during storage.
Peptide Proline Cis-Trans Isomerization After Reconstitution
Proline cis-trans isomerization in reconstituted peptides creates conformational heterogeneity that alters receptor binding and potency over time during storage.