Peptide Impurity Profiling: Deletion Sequences, Truncations, and Side Products
A purity percentage is only the start of peptide quality review. Impurity profiling asks what else may be present, where those related substances came from, and how analytical methods help separate the target peptide from synthesis and storage byproducts.
Jul 17, 2026
Research Use Only Quality Literacy
Peptide Impurity Profiling: Deletion Sequences, Truncations, and Side Products
A purity percentage is only the start. Impurity profiling asks what else may be present and how strong the analytical evidence is.
Research Use Only Disclaimer
BetterBio Synthesis materials and educational content are intended for laboratory research use only. This article is not medical advice, does not recommend human or animal use, and does not provide dosing, administration, treatment, cure, or efficacy guidance. Any peptide, compound, or research material discussed here should be evaluated only by qualified professionals in appropriate research settings and in accordance with applicable laws, institutional requirements, and safety protocols.
A peptide can test as “high purity” and still deserve a deeper question: what makes up the remaining fraction?
That is the purpose of peptide impurity profiling. Instead of treating purity as a single number, impurity profiling looks at the related substances that may sit around the target peptide: deletion sequences, truncations, insertion products, side-reaction products, oxidized species, deamidated forms, dimers, residual process materials, or degradation products formed after synthesis.