What Degrades Peptides at the Molecular Level?
Peptides degrade mainly through deamidation, oxidation, hydrolysis and aggregation, each of which alters the molecule in a different way and is triggered by different conditions. Knowing the mechanism tells you exactly how to store and handle a sample.
Deamidation and Oxidation
Deamidation converts asparagine and glutamine residues into aspartic and glutamic acid, shifting the peptide’s charge, while oxidation modifies methionine and cysteine residues. Both are accelerated by temperature and exposure to air, which is why sealed, frozen storage matters.
Hydrolysis and Aggregation
Hydrolysis breaks peptide bonds in the presence of water, and aggregation causes peptides to clump into inactive structures — both of which are why reconstituted solutions degrade far faster than lyophilized powder. This is the molecular reason behind the storage rules.
What This Means for Your Lab
The practical takeaway is to minimize the three accelerators — heat, water and air — by keeping powder lyophilized at -20°C and reconstituting only at the point of use. For batch-specific stability data on any peptide, message WhatsApp: +852 4419 8097.
Frequently Asked Questions
Q1: What are the main peptide degradation mechanisms?
Deamidation, oxidation, hydrolysis and aggregation are the four primary degradation pathways.
Q2: Why does reconstituted peptide degrade faster?
Because hydrolysis and aggregation require water, so a peptide in solution is far more vulnerable than lyophilized powder.
Q3: How do I slow peptide degradation?
Minimize heat, water and air exposure — keep powder lyophilized at -20°C and reconstitute only at the point of use.
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