A custom peptide synthesis quote is only as useful as the specifications behind it. Two enquiries for the same sequence can require very different work if they differ in quantity, purity, terminal chemistry, modifications, analytical documentation or delivery requirements. For a faster and more useful quotation, give the supplier a clear technical brief instead of asking for a price based on a peptide name alone.
SciLight Biotechnology reviews research peptide projects according to the customer’s sequence and agreed requirements. Use this guide to prepare an enquiry for custom peptide synthesis or a larger wholesale peptide order.
Information to include in a peptide synthesis RFQ
1. Sequence and chemical structure
Provide the full amino acid sequence in one-letter or three-letter code. Identify D-amino acids, non-standard residues, disulfide bonds, cyclization, terminal modifications, labels, linkers or conjugation requirements. Explain any ambiguity in the sequence and attach a structure file when it helps clarify the request.
2. Target quantity
State the requested amount for each sequence and the required unit. Tell the supplier whether the quantity is needed in one batch, multiple vials or repeat shipments. Separate the amount of each peptide rather than giving only a combined project total.
3. Purity and analytical expectations
Specify the target purity and identify the analytical evidence your procurement or research team expects. Ask whether the proposed scope includes chromatographic purity assessment, mass-based identity confirmation, or a more detailed report. Analytical methods answer different questions; a single purity percentage should not be treated as a complete description of material quality.
4. Purification and formulation preferences
Indicate whether a purification method, counter-ion, salt form, solvent or other material attribute matters to your work. Do not assume a particular form is available. Ask the technical team to review whether your requirement is compatible with the sequence and intended handling.
5. Delivery and documentation
Provide the destination country, preferred delivery window, packaging needs and any institutional documentation requirements. Import rules differ across jurisdictions, so the receiving organization should confirm its own requirements before ordering.
What affects the cost of custom peptide synthesis?
Quotation factors commonly include sequence length, residue composition, difficult or hydrophobic regions, non-standard amino acids, modifications, target purity, quantity, purification effort and analytical scope. A sequence with unusual chemistry may need more technical assessment than a straightforward linear sequence. Larger quantities do not always translate into a simple per-gram calculation because scale, yield, purification and quality requirements interact.
For that reason, compare quotations line by line. Confirm whether synthesis, purification, analytical testing, packaging and shipping are included or listed separately. Ask suppliers to state assumptions and exclusions.
How to compare peptide synthesis quotations
- Confirm that every supplier quoted the same sequence and quantity.
- Compare purity targets and analytical deliverables, not just the headline percentage.
- Check whether requested modifications are included in the quoted scope.
- Review lead-time assumptions and what happens if the sequence needs optimization.
- Clarify repeat-order specifications, documentation and shipping terms.
Our guide to evaluating a peptide supplier provides a broader vendor-review checklist. For technical testing requirements, visit peptide characterization services.
Request a project-specific peptide quote
Send the sequence, quantity per sequence, target purity, modification details, analytical expectations and delivery destination through the SciLight quotation form. Complete specifications allow a more meaningful feasibility review and a quotation based on the work your project actually requires.
This information is for scientific procurement and research planning. It is not medical advice or authorization for clinical use.