What Should You Include in an RFQ When Contacting a Peptide Factory?

A well-prepared RFQ is the fastest way to get accurate quotes and realistic timelines from a peptide factory. Many buyers send incomplete requests, forcing technical teams to go back and forth for missing details. This delays quotations and sometimes leads to misaligned expectations on purity, scale and product specifications.

Start with the full peptide sequence. Write out each amino acid in order, and clearly mark any modifications at the N-terminus, C-terminus or side chains. Acetylation, amidation, phosphorylation or fluorescent tags all change synthesis complexity and pricing. If you have preferred protecting groups or special requirements for cyclization, note them upfront. Omitting modification details is one of the most common causes of revised pricing after quotation.

State your target purity grade clearly. Different applications require different standards. Specify whether you need crude material, 85%, 95% or higher purity, and define what test method should be used, usually HPLC. Also mention acceptable impurity thresholds if you have internal limits. This helps the peptide factory select suitable purification strategies.

Indicate the required quantity and packaging format. Separate trial sample quantity and bulk order volume. Some buyers only need milligram-scale testing first before scaling up. Also specify if you require individual vial packaging, bulk foil pouches, inert gas filling or cold-pack shipping. Packaging choices affect both cost and product stability during transit.

Add your intended application, without overstated therapeutic claims. Let the factory know whether the peptide is for lab research, cosmetic raw material formulation or screening tests. The application helps their chemists recommend appropriate quality standards and documentation packages, such as COA, HPLC traces and mass spectrometry reports.

List all required documentation. Specify which files you expect to receive alongside delivery: batch COA, mass spec data, HPLC chromatograms, batch production records, or stability test summaries. If you need documents formatted for internal audits or customs clearance, state these requirements in your RFQ.

Mention your target lead time and shipping destination. Realistic deadlines help the peptide factory check equipment schedules and reserve production slots. Include the delivery country so they can assess export paperwork and advise on suitable shipping options, especially if cold-chain transport is needed.

Leave space for technical feedback. A good RFQ invites the peptide factory to flag potential risks, such as sequence aggregation, low solubility or difficult synthesis steps. Their chemists may suggest minor design adjustments to improve yield and reduce cost, which can save you trouble later in your project.

When your RFQ contains all these details, the peptide factory can evaluate the project accurately. Fewer rounds of clarification mean faster quotations, fewer misunderstandings and a smoother start to your peptide development work.