Custom peptide synthesis lets researchers order specific sequences from contract labs. Compare methods, purity grades, turnaround times, and regional providers.
Custom peptide synthesis is the laboratory process of producing a specific peptide sequence on demand, usually through solid-phase peptide synthesis (SPPS). Researchers provide the desired amino acid sequence, and a contract lab builds the peptide step by step, then purifies and quality-checks it. These products are sold for research use only and are not approved by the FDA for human use.
What Is Custom Peptide Synthesis?
Custom peptide synthesis differs from buying catalog peptides because the sequence, length, and modifications are defined by the customer. A catalog peptide is pre-made and limited to what a vendor stocks; a custom order can be any sequence within technical limits. Most labs use custom synthesis when studying a specific protein fragment, epitope, or binding motif.
Typical customers include academic researchers, biotech companies, and pharmaceutical development teams. They order peptides for assays, antibodies, vaccines, and structural studies. The final product is a lyophilized powder that is reconstituted in a suitable solvent before use.
How the Synthesis Process Works
Solid-phase peptide synthesis (SPPS) is the dominant method for custom peptides. The growing chain is anchored to a resin bead, and reagents are added in cycles to attach each amino acid. After the chain is complete, the peptide is cleaved from the resin and purified by high-performance liquid chromatography (HPLC).
Solid-Phase vs. Solution-Phase Synthesis
Solution-phase synthesis is sometimes used for short peptides or specialized chemistry, but SPPS is far more common. The table below summarizes the main differences.
| Feature | Solid-Phase (SPPS) | Solution-Phase |
|---|---|---|
| Typical peptide length | 5–50 residues | 2–10 residues |
| Purity achievable | Up to >98% | High but harder to scale |
| Cost for small scale | Lower | Higher |
| Automation | Highly automated | Often manual |
| Common use | Research and preclinical | Specialty short sequences |
Longer peptides and full proteins are usually produced recombinantly rather than by chemical synthesis. For sequences beyond about 50 amino acids, yields and purity drop sharply with SPPS.
Key Specifications to Define Before Ordering
A clear specification sheet prevents delays and costly re-runs. Most providers ask for the following details.
- Sequence: One-letter amino acid code, including any D-amino acids or non-natural residues.
- Modifications: Acetylation, amidation, biotin, fluorescent tags, phosphorylation, or PEGylation.
- Purity: Usually 70%, 80%, 95%, or 98% as measured by HPLC.
- Scale: Milligrams to grams, depending on assay needs.
- Counterion: Trifluoroacetate (TFA) or acetate, which can affect biological assays.
- Form: Lyophilized powder is standard; some labs request pre-dissolved aliquots.
Purity above 95% is standard for most biological assays. Lower purity grades can be acceptable for screening, but they may contain truncation products that interfere with sensitive experiments.
Purity, Scale, and Common Modifications
Purity and scale drive cost more than any other factor. A 5 mg order at 95% purity is relatively inexpensive, while a 100 mg order at 98% purity with multiple modifications can cost thousands of dollars. Fluorescent labels and phosphorylation add synthesis steps and reduce overall yield.
Common modifications include N-terminal acetylation to block degradation, C-terminal amidation to mimic natural peptide hormones, and biotinylation for pull-down assays. Each modification should be confirmed by mass spectrometry in the certificate of analysis.
Choosing a Custom Peptide Synthesis Service
A reputable custom peptide synthesis service will provide a certificate of analysis (COA) with HPLC and mass spectrometry data. Turnaround times range from a few days for short unmodified peptides to several weeks for long or heavily modified sequences.
Many academic groups prefer custom peptide synthesis usa companies for same-timezone support and domestic shipping. European researchers often request custom peptide synthesis uk services when they need faster domestic delivery and invoicing in GBP. Providers in Asia, including custom peptide synthesis china companies, can offer lower prices but may add shipping and customs time. Labs in the Asia-Pacific region sometimes choose Australian suppliers for regional logistics.
Large vendors such as custom peptide synthesis thermo fisher are often compared with specialized boutique labs. Large vendors excel at catalog-scale production and standardized quality systems, while boutique labs may handle unusual modifications or very short deadlines. Always request a small test order before committing to a large batch.
Cost and Turnaround Factors
Several variables determine the final price and delivery date.
- Sequence length: Each additional amino acid lowers yield and raises cost.
- Purity level: Moving from 80% to 98% purity can double the price.
- Modifications: Non-standard residues and labels add synthesis cycles.
- Scale: Larger quantities benefit from economies of scale, but not linearly.
- Documentation: Custom COAs, endotoxin testing, and confidentiality agreements may add fees.
Rush orders are available from many providers for an extra charge. Standard turnaround for a 15-mer at 95% purity is often 5–10 business days after order confirmation.
Quality Control and Safety Considerations
Every custom peptide order should arrive with analytical data. At minimum, request an HPLC chromatogram and a mass spectrometry spectrum that match the theoretical mass. For cell-based assays, consider endotoxin testing to avoid false inflammatory responses.
Custom peptides are sold for research use only. They are not drugs, supplements, or approved treatments, and they should never be injected or ingested by humans. If you are considering peptides for a health condition, consult a licensed healthcare professional rather than purchasing research-grade material.
Questions to Ask a Peptide Synthesis Provider
- What is the typical purity and yield for my sequence?
- Do you provide HPLC and mass spectrometry data for every batch?
- Can you handle non-natural amino acids or multiple labels?
- What is the lead time, and is rush service available?
- Do you offer endotoxin testing or sterile filtration?
Comparing at least three quotes helps researchers balance cost, speed, and quality. A lower price can be worthwhile for screening, but confirm that the provider’s analytical data meets your experimental standards.
Frequently Asked Questions
What is custom peptide synthesis used for?
Researchers use custom peptides for antibody production, binding assays, vaccine development, and structural studies. They are also common in preclinical drug discovery. Custom peptides are for laboratory research only and are not intended for human use.
How much does custom peptide synthesis cost?
A small 5 mg order at 80–95% purity typically costs $100–$300. Larger quantities, higher purity, and modifications like fluorescent labels can push the price above $1,000. Comparing at least three quotes helps control costs.
How long does custom peptide synthesis take?
Most short, unmodified peptides at 95% purity ship within 5–10 business days after order confirmation. Long sequences or multiple modifications may take 2–4 weeks. Rush service is often available for an extra fee.
This page provides educational research information and does not replace medical advice, diagnosis, or treatment.