Aspartate Isomerization in Stored Peptides: Succinimide Risk
Learn how aspartate isomerization and isoaspartate accumulation via succinimide intermediates degrade reconstituted peptides at Asp-Gly, Asp-Ser, and Asp-Thr motifs during storage.
Articles
Peptide Disulfide Bond Scrambling During Alkaline Storage
Learn how reconstituted peptide disulfide bond scrambling occurs at alkaline pH from trace reducing agents like DTT, BME, and TCEP in stored peptides.
Reconstituted Peptide Mixing Errors & Dose Variability
Reconstituted peptide incomplete mixing causes concentration gradients and dose variability. Learn how viscosity, vortexing errors, and stratification affect protocols.
Methionine Oxidation in Reconstituted Peptides During Storage
Learn how methionine oxidation from residual hydrogen peroxide in bacteriostatic water degrades reconstituted peptides during refrigerated storage and affects potency.
Peptide Histidine Oxidation & 2-Oxohistidine Formation
Learn how peptide histidine oxidation and 2-oxohistidine formation occur via metal-catalyzed Fenton chemistry from trace metal contaminants during storage.
TFA Counterion in Peptides: How It Skews Bioassays
Learn how TFA counterion contamination in reconstituted peptides disrupts cell viability bioassays, alters mass calculations, and confounds research outcomes.
Peptide Freeze-Thaw Cryoconcentration & Degradation Guide
Learn how freeze-thaw cycling causes peptide cryoconcentration, shifting pH and ionic strength in unfrozen microdomains that accelerate aggregation and degradation.
Tryptophan Oxidation in Reconstituted Peptides: Storage
Learn how tryptophan oxidation via singlet oxygen in reconstituted peptides stored in non-amber vials generates N-formylkynurenine and disrupts binding.
Reconstituted Peptide Pyroglutamate Formation Explained
Learn how reconstituted peptide pyroglutamate formation occurs through spontaneous N-terminal glutamine and glutamate cyclization during storage and its impact on stability.
Peptide N-Formylation From Residual Formic Acid in TFA
Learn how residual formic acid trace contaminants from TFA-to-formate salt exchange cause N-formylation in reconstituted peptides during storage.