How Research Peptides Are Made: Solid-Phase Synthesis to Freeze-Dried Vial
How Research Peptides Are Made: Solid-Phase Synthesis to Freeze-Dried Vial is supplied for laboratory research only. Key facts are below; stored as lyophilised powder.
Last verified 12 Oct 2026.
A CoA for every lot; each vial carries a printed lot number that matches it. Ask with the lot number and we send it.
The short answer
Most research peptides are built by solid-phase peptide synthesis (SPPS), cleaved from the resin, purified by preparative HPLC, optionally salt-exchanged, then freeze-dried and tested by HPLC and MS.
Research use only. Sable Peptides supplies laboratory reagents for in vitro and laboratory research by qualified people. Not a medicine. Not for human or veterinary use.
The short answer
Most research peptides are built by solid-phase peptide synthesis (SPPS), cleaved from the resin, purified by preparative HPLC, optionally salt-exchanged, then freeze-dried and tested by HPLC and MS.Step by step
1. Anchor: the C-terminal amino acid is attached to a resin (Merrifield, 1963). 2. Deprotect and couple: rounds of Fmoc removal and activated amino-acid coupling extend the chain. Washing between steps removes excess reagents (Coin et al., 2007). 3. Cleave: an acid cocktail, typically TFA-based, releases the peptide and removes side-chain protecting groups. 4. Purify: preparative reversed-phase HPLC isolates the target from truncated and deletion sequences (Mant et al., 2007). 5. Salt exchange (optional): TFA counter-ions can be exchanged for acetate or chloride. 6. Lyophilise: the purified fractions are freeze-dried to a stable solid (Tang & Pikal, 2004). 7. QC and release: analytical HPLC and mass spectrometry, documented on a lot COA.Where impurities come from
Incomplete couplings give deletion sequences. Side reactions (aspartimide formation, racemisation, oxidation) give closely related species. Aggregation-prone "difficult sequences" make both worse (Coin et al., 2007). Purification and QC exist to find and remove them.Synthetic vs recombinant
Recombinant expression suits long chains. Synthetic routes dominate for short peptides and for sequences with non-natural residues or terminal modifications.Related on Sable
- /learn/hplc-purity-explained - /learn/lyophilisation-explained - /learn/what-are-research-peptidesSources
1. Merrifield RB. Solid Phase Peptide Synthesis. I. The Synthesis of a Tetrapeptide. *Journal of the American Chemical Society* 1963;85:2149-2154. doi:10.1021/ja00897a025 2. Coin I et al.. Solid-phase peptide synthesis: from standard procedures to the synthesis of difficult sequences. *Nat Protoc* 2007;2:3247-56. PMID 18079725. doi:10.1038/nprot.2007.454 3. Mant CT et al.. HPLC analysis and purification of peptides. *Methods Mol Biol* 2007;386:3-55. PMID 18604941. PMC7119934. doi:10.1007/978-1-59745-430-8_1 4. Tang X et al.. Design of freeze-drying processes for pharmaceuticals: practical advice. *Pharm Res* 2004;21:191-200. PMID 15032301. doi:10.1023/b:pham.0000016234.73023.75*Last reviewed: 2026-10-10. Original Sable content; sources verified via PubMed E-utilities / Crossref / live HTTP checks on 2026-10-10.*
Last reviewed: 2026-10-10
How much does How Research Peptides Are Made: Solid-Phase Synthesis to Freeze-Dried Vial cost in the UK?
Frequently asked questions
What is solid-phase peptide synthesis (SPPS)?
A method in which the chain is built one amino acid at a time while anchored to an insoluble resin, so excess reagents can be washed away after each step.
Who invented SPPS?
R. Bruce Merrifield described it in 1963.
What is Fmoc chemistry?
The most widely used SPPS strategy. It protects each incoming amino acid with an Fmoc group that is removed under mildly basic conditions.
Why are some sequences 'difficult'?
Growing chains can aggregate on the resin, which lowers coupling efficiency and creates deletion impurities.
Are research peptides made recombinantly?
Short peptides are usually made synthetically. Recombinant expression is more common for long chains and proteins.