Peptide Histidine Oxidation & 2-Oxohistidine Formation
Learn how reconstituted peptide histidine oxidation and 2-oxohistidine formation occur through metal-catalyzed Fenton chemistry at copper and iron binding sites.
Articles
Methionine Sulfoxidation in Reconstituted Peptides
Learn how methionine sulfoxidation degrades reconstituted peptides through hydrogen peroxide and reactive oxygen species in bacteriostatic water storage.
Peptide Freeze-Thaw Damage: Cryoconcentration Effects
Learn how repeated freeze-thaw cycles cause peptide degradation through cryoconcentration, ice crystal formation, and aggregation in stored reconstituted peptide aliquots.
Tryptophan Photooxidation in Reconstituted Peptides
Learn how tryptophan photooxidation degrades reconstituted peptides through singlet oxygen and light exposure, and how proper storage prevents this damage.
Formaldehyde Crosslinks in Stored Peptides From Closures
Learn how formaldehyde leachables from rubber stoppers and silicone plunger tips cause methylol adducts and crosslinks in reconstituted peptides during storage.
Peptide Adsorption to Vial Surfaces: Why You Lose Potency
Learn how reconstituted peptide adsorption to glass vials, polypropylene tubes, and syringe surfaces causes potency loss at low concentrations during storage.
Pyroglutamate Formation in Reconstituted Peptides Explained
Learn how pyroglutamate formation occurs in reconstituted peptides through N-terminal glutamine cyclization, causing mass loss and charge changes during storage.
Peptide Cysteine Oxidation During Storage: Causes & Prevention
Learn how dissolved oxygen causes cysteine thiol oxidation in reconstituted peptides, why pH affects sulfhydryl stability, and how to prevent peptide degradation.
Peptide Acylation from Polysorbate Degradation Products
Learn how peptide acylation occurs when polysorbate 80 and polysorbate 20 degradation products react with nucleophilic peptide side chains during storage.
Peptide Tyrosine Nitration During Storage: Causes & Prevention
Learn how trace nitrite contaminants from sodium azide photolysis cause peptide tyrosine nitration via peroxynitrite during reconstituted peptide storage.