Peptide Synthesis

Definition

Peptide synthesis is the chemical process of assembling peptide chains by forming peptide bonds between amino acid monomers in a defined sequence order. Modern synthetic peptides are produced almost exclusively by solid-phase peptide synthesis (SPPS), developed by Merrifield in the 1960s, which attaches the growing peptide chain to a solid resin support and adds amino acids sequentially through iterative coupling and deprotection cycles. After synthesis, the peptide is cleaved from the resin, side-chain protecting groups are removed, and the crude product is purified by preparative HPLC. The final product is characterized by analytical HPLC and mass spectrometry before release for research use.

Research Context

Peptide synthesis is the production method for the vast majority of research peptides available in the research compound market. Understanding the synthesis process helps researchers appreciate the sources of potential impurities (incomplete coupling, deprotection side reactions, racemization at sensitive residues) and the importance of rigorous purification and analytical characterization. The quality of peptide synthesis directly affects the purity, identity, and biological reliability of the research compound. Manufacturers producing research-grade peptides at 98% purity or above use optimized synthesis conditions and preparative HPLC purification to achieve this standard.