Chemistry
Why peptides degrade the moment they meet water
A peptide in dry powder form is stable for years. A peptide in solution starts losing potency the moment reconstitution happens.
This page covers the three mechanisms that cause the loss – hydrolysis, oxidation, and aggregation – and why they matter for anyone comparing freeze-dried and pre-filled formats.
Mechanism 1
Hydrolysis – the water attack
Placeholder: Cover how water molecules cleave peptide bonds. Note that even bacteriostatic water only slows microbial growth, not chemical breakdown. Reference typical rate constants if Louie has them. Louie: replace this block with your prose.
Mechanism 2
Oxidation – the oxygen attack
Placeholder: Cover cysteine and methionine residue vulnerability. Note effect of dissolved oxygen in reconstitution water and the role of low-temperature storage. Louie: replace this block with your prose.
Mechanism 3
Aggregation – peptides sticking together
Placeholder: Cover how peptides self-associate in solution, especially at higher concentrations. Note effect of freeze-thaw cycles and mechanical agitation (why we never shake). Louie: replace this block with your prose.
What it means
What this means for your kit
Three practical consequences follow from the chemistry above:
- Freeze-dried survives shipping. A pre-filled pen has been in solution since the factory, through freight, customs, and warehousing. A freeze-dried kit stays dry until you reconstitute it yourself. See Freeze-dried vs pre-filled.
- Reconstitute only what you’ll use. Once in solution, the clock starts.
- Storage matters. Refrigerated, dark, unshaken. See our reconstitution and storage guide.
Supplied strictly for laboratory research use. Not for human consumption. Not intended to diagnose, treat, cure or prevent any disease. Purchasers must be 18 or over.