Custom synthesis at Shandong Shengyuan Peptide begins with a free feasibility review of your sequence. Our chemists assess synthesis difficulty, recommend a purity grade and timeline, and confirm pricing before any work begins — so there are no surprises later in the project.
What We Synthesize
- Linear peptides from 2 to 100+ residues
- Cyclic peptides — head-to-tail, disulfide-bridged, and stapled structures
- Difficult sequences — aggregation-prone, hydrophobic, and long-chain peptides
- Modified peptides — N-terminal acetylation, C-terminal amidation, D-amino acid substitution
- Conjugates and labels — PEGylation, biotinylation, fluorescent dyes, isotopic labels
The Workflow
- Feasibility review — sequence analysis, difficulty scoring, purity target, timeline, and quotation.
- Synthesis — automated SPPS with real-time coupling monitoring.
- Purification — preparative HPLC to your purity grade (crude to ≥99%).
- Analysis — RP-HPLC purity, ESI-MS identity, peptide content, water content.
- Lyophilization & packaging — lyophilized to stable dry powder, packed to your vial specification.
- Release — QA-reviewed Certificate of Analysis with raw HPLC and MS data on request.
Scale and Turnaround
| Research scale | 1–100 mg, typically delivered in 2–3 weeks |
|---|---|
| Pilot scale | 1–50 g, typically delivered in 4–6 weeks |
| Commercial scale | 50 g–multi-kg, timeline agreed in the project plan |
How to Request a Quote
Send your sequence, quantity, purity grade, modifications, and target date via the contact form. Include any special requirements — salt form (acetate/TFA), vial filling spec, or private labeling — and we will respond with a technical quotation within 24 hours.