Procurement and Supplier Knowledge
Buying a custom peptide is a specification exercise before it is a purchasing exercise. This hub explains what makes a quotation comparable, which factors actually move price and lead time, how to qualify a supplier, and what to arrange for shipping and customs so the material arrives in a usable condition.
What to include in a peptide RFQ
A comparable request for quotation contains the sequence, N- and C-terminal modifications, non-natural residues, quantity, purity target, salt form, delivery form, required documentation and any deadline. If the sequence is confidential, a generic description of length, hydrophobicity and modification is enough for an indicative quote. Quotes that omit the purity method or the quantity basis are difficult to compare and often hide a specification difference.
What drives custom peptide price
Price is driven mainly by length, sequence difficulty, purity target, quantity and the number of analytical tests. A 30-mer at 98 percent purity costs more than a 10-mer at 95 percent because purification losses rise sharply with length and hydrophobicity. Small pilot lots carry a higher price per milligram than repeat campaigns, where resin and reagent costs are amortised across a larger batch.
Lead time and the critical path
Lead time is not a single production step. It includes feasibility review, sequence optimisation, resin loading, chain assembly, cleavage, purification, analysis and, where required, lyophilisation and documentation. Delays usually come from an unclear specification, a difficult purification that needs method development, or a customer change after synthesis has started. Freezing the specification before the batch begins is the most effective way to protect the schedule.
Supplier qualification and second sourcing
A supplier should be qualified on evidence: analytical methods, batch records, deviation handling and responsiveness, not only on price. Second sourcing is prudent for programmes that cannot tolerate a supply interruption, but it requires each supplier to be qualified against the same specification. Re-testing the material from a second supplier against your method is the only way to know the two products are interchangeable.
Shipping, customs and packaging
Most lyophilised peptides ship at ambient temperature with desiccant and are stable for the transit period; heat-sensitive or solution products need cold-chain packaging. Commercial invoices must describe the goods accurately, and the importer is responsible for duties and local regulatory requirements. Packaging should protect the vial from light and moisture, and the shipment should include the certificate of analysis and the safety data sheet where required.
Articles in this topic
- A Positive Labeled-Peptide Signal — Controls for Competing Explanations
- Antibody Production with Synthetic Peptides — Controls for Peptide and Protein Recognition
- Peptide Purification Services — Write a Brief for Purity and Usable Recovery
- Amino Protecting Groups — Plan a Multistep Peptide Modification
- Recombinant Peptide Synthesis — Compare Precursor Processing and Mature Termini
- Enzymatic Peptide Synthesis — A Project Brief for Junction-Specific Ligation
- Long Peptide Targets — Compare Chemical Synthesis, Protein Expression and Combined Routes
- The Cost of a 12-Residue Peptide — Quotation Scope and Reproducibility Records
- Why 3D Cell Culture Is Creating New Demand for Better Peptide Scaffolds and Modifiers
- Why Oral Peptide Delivery Is Moving Beyond the Molecule Itself
- Peptide Development Partner Due Diligence: The Evidence Package a Deal Review Will Test
- Peptidomics Meets Docking: A Smarter Peptide–Protein Interaction Workflow
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Frequently asked questions
How long does a custom peptide order take?
Typical purified lots take two to four weeks after specification approval. Difficult sequences, custom modifications, higher purity targets and larger quantities add time. The quotation states the lead time for the agreed specification rather than a generic average.
Why are two quotes for the same peptide so different?
The sequence may be the same but the specification often is not. Purity method, quantity basis, salt form, analytical tests and documentation can all differ. Compare quotes line by line against a fixed specification before comparing price.
Can you ship to my country?
We ship worldwide with the documentation required for the destination. The importer is responsible for import permits and duties where applicable. Tell us the destination during the quotation so the correct paperwork and packaging are arranged.
Do you offer OEM or wholesale supply?
Yes. Repeat campaigns and OEM supply are quoted against a fixed specification and a defined batch size. A pilot batch is normally produced and approved before a larger campaign is scheduled.
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