How Custom Peptide Synthesis Works: From Sequence to Shipment

A custom peptide order starts with a sequence. Before synthesis begins, the sequence is reviewed for practical issues: length, difficult residues, modification points and solubility. A clear sequence at this stage prevents most problems later, which is why suppliers ask for as much detail as possible in the initial inquiry.

The chain is built by solid-phase peptide synthesis. Amino acids are added one at a time to a growing chain anchored on a solid support. Each addition is a cycle of coupling and washing, and the whole build is automated. After the final amino acid, the peptide is cleaved from the support and the crude product is recovered.

Crude peptides are rarely pure enough to ship. Purification, usually by preparative HPLC, removes truncated chains and by-products. The purified material is then checked: identity by mass spectrometry, purity by analytical HPLC. These results form the core of the certificate of analysis.

Finally the peptide is lyophilised, packed and documented. The batch is tied to a specification, an analytical record and a label, so that every step can be traced back to the agreed scope. This traceability is what turns a custom synthesis project into a documented supply.

If you are planning a custom project, the four details that help most are the sequence, any modifications, the required quantity and the documentation you need. Send those together and the review can start immediately.