Environmental factors in peptide degradation Peptides are biological polymers of amino acids held together by peptide bonds. They are sensitive to environmental factors: - Temperature: Elevated temperatures accelerate chemical reactions, leading to hydrolysis, oxidation, or thermal denaturation. - Light: Exposure to ultraviolet light can cause photo-oxidation of specific amino acid residues, particularly tryptophan and tyrosine. - Moisture: Lyophilization removes water molecules to prevent chemical reactions, but any moisture ingress will lead to degradation.
The role of lyophilization Lyophilization (freeze-drying) converts the peptide from a liquid solution to a dry powder. By removing moisture, the chemical activity is greatly reduced, enabling stability at moderate temperatures. However, extreme heat during shipping can still cause degradation.
Thermal packaging standards To protect compounds from temperature spikes during domestic fulfillment, quality suppliers use insulated packaging: - Insulated Cold-Chain Mailers: Reflective thermal foil or expanded polystyrene inserts block radiant heat. - Gel Ice Packs: Cold-packs maintain a lower internal temperature relative to ambient air during transit. - Expedited Shipping: Minimizing transit time to 2-3 days reduces the thermal exposure duration.