Buyer guide
Peptide synthesis methods for a defined B2B project
Compare how SPPS and LPPS assemble a peptide, then ask the route and analytical questions that belong in your project quote.
SPPS and LPPS comparison
What changes in the synthesis route?
Solid-phase peptide synthesis (SPPS) and liquid-phase peptide synthesis (LPPS) describe different ways of assembling a peptide. Use these distinctions to ask a specific route question. The applicable route and feasibility are confirmed in writing for the sequence, modifications and requested quantity.
On a narrow screen, scroll the table horizontally to compare all four columns.
| Review point | SPPS | LPPS | What the buyer should clarify |
|---|---|---|---|
| Where the peptide is assembled | The growing peptide chain is attached to an insoluble polymer support. | Peptide assembly takes place in solution. | Ask which route is proposed for the defined sequence and final material specification. |
| Intermediate handling | The peptide remains on the support during assembly; reagents and by-products can be separated from that support-bound material. | Depending on the proposed route, intermediates can be isolated, characterized and purified. | Ask what intermediate controls and final purification are included in the project scope. |
| Sequence-dependent considerations | Sequence length and the resulting crude mixture can affect the purification challenge. | Solubility and compatibility of the planned protecting chemistry can affect route planning. | Ask for the route choice to be explained for the actual sequence, modifications and requested quantity. |
| Final analytical evidence | Record identity, HPLC purity and peptide-content requirements separately from the route. | Record the same analytical requirements separately from the route. | Confirm the method and result basis for each required attribute, which records apply to the supplied lot, and which attributes remain unconfirmed. |
Method background: Bachem's introduction to peptide synthesis methods. Analytical attribute background: AnaSpec's QC testing attributes. These sources explain method concepts and separate analytical attributes; BioPepSyn Lab's route, testing and document scope remain project-confirmed.
Route decision questions
Ask for the route choice and the evidence separately.
The method acronym alone does not establish the supplied material's identity, HPLC purity or peptide content. Put the route discussion and final-lot requirements in the same written brief.
Use the full synthesis RFQ briefFor document review, see the COA and HPLC guide. Keep synthesis scale and delivered quantity as separate quotation fields.
Why this route for this project?
Which route is proposed for the sequence, modifications and requested delivered quantity, and what project factors support that choice? If your team has no route requirement, mark it “supplier recommendation requested.”
What work is included?
Which intermediate controls and final purification are included? Ask the written response to distinguish assembly from purification and analytical work.
Which final-lot records answer each requirement?
Which records address identity, HPLC purity and peptide content? Confirm the method, result basis and lot linkage for each required attribute.
Supply presentation
Make the final format match the quotation.
Keep the synthesis scope and final vial, kit or bulk presentation in the same project quote. Use the brief below to distinguish requested fields from the scope confirmed in writing.
Review custom synthesis serviceBuyer brief fields
Put the decision fields in writing.
State what is known and mark undecided fields for review. Method, feasibility, quantities and document availability remain project-confirmed. This table is a procurement checklist, not a synthesis protocol.
| Field | Buyer supplies | Confirmed in writing |
|---|---|---|
| Route | SPPS, LPPS, another route to compare or “supplier recommendation requested” | Applicable method and feasibility for the sequence, modifications and scale |
| Sequence / modification | Sequence, catalog reference or target structure, including N-terminal, C-terminal, labeling, cyclization or other modifications | Accepted structure, modification scope and reference |
| Scale / quantity | Synthesis scale, bulk amount and intended vial or kit quantity as separate fields | Quoted quantity, unit and commercial scope; custom quantities confirmed by project |
| Purification / purity | Written purification target and requested analytical fields | Available specification and applicable batch evidence; a marketing label is not a batch result |
| Analytical records | COA, HPLC, identity or independent testing request | Item or current-lot reference, report date, method and result basis, sample scope and testing terms |
| Format / packing | Amount per vial, pack count and labels, or bulk container; required packing and seller records | Final presentation and release document pack |
| Destination / timing | Country, postal code, target date, route assumptions and previous quote or lot reference for repeat supply | Preparation and production timing, delivery route, destination-based transit estimate and responsibilities |
For analytical scope, see the COA and HPLC guide and third-party batch testing guide. Vial-format order quantities are confirmed by project; bulk and custom quantities remain project-specific.
Route FAQ
Questions buyers ask before a synthesis quote.
What is SPPS?
SPPS means solid-phase peptide synthesis. The growing peptide chain is attached to an insoluble polymer support during assembly. Whether this route is appropriate for your sequence, modifications and requested quantity is confirmed in the project review.
What is LPPS?
LPPS means liquid-phase peptide synthesis. Peptide assembly takes place in solution. Depending on the proposed route, intermediates can be isolated, characterized and purified. The applicable route and included controls are confirmed for the individual project.
Should a buyer request HPLC and identity records?
Yes, where those records are needed for the written specification. Request the applicable item or lot, report date and available fields. Third-party COA, HPLC and independent testing remain project- or batch-confirmed.
How is the custom synthesis quantity confirmed?
Custom synthesis and bulk quantities are reviewed against the individual brief and confirmed in the project quote.
Next step
Confirm the route in writing.
Share the sequence, scale, modifications and required analytical records for a technical review.