Peptide degradation can occur when a peptide is exposed to conditions that promote chemical change or physical instability. In laboratory settings, the most common drivers are:
- Moisture, which can accelerate hydrolysis and other side reactions.
- Heat, which may increase the rate of decomposition over time.
- Light, especially for sequences or formulations sensitive to photochemical damage.
- Repeated temperature cycling, which can stress both solution and lyophilized materials.
- pH extremes and incompatible buffers, which may alter side-chain or backbone integrity.
- Oxidation, particularly for residues such as methionine, cysteine, and tryptophan.
- Contamination from salts, solvents, or improper labware handling.
Researchers typically monitor degradation through HPLC, mass spectrometry, and related quality control checks to detect impurity formation or sequence modification. Proper packaging, controlled storage, and minimized handling help reduce risk. As with all research use only materials, peptides should be managed according to laboratory procedures and are not intended for human consumption.