Learn how Sigma custom peptide synthesis works, including scales, purities, modifications, and turnaround times for research-grade peptides and more.
Sigma custom peptide synthesis is the custom peptide production service offered by MilliporeSigma, the life science business of Merck KGaA. Researchers can order peptides built to their exact sequence, length, purity, and modification requirements. All products from this service are sold for research use only and are not intended for human or veterinary use.
The service is part of a larger portfolio that includes antibodies, biochemicals, and analytical tools. Many laboratories use the service for projects that range from small-scale screening to large preclinical studies. Understanding the available options helps researchers choose the right peptide for their experiments.
What Sigma Custom Peptide Synthesis Offers
MilliporeSigma provides a range of custom peptide synthesis options for academic, biotech, and pharmaceutical researchers. The service covers standard linear peptides, modified peptides, and specialty constructs. Typical orders include peptides for antibody production, assay development, and structural studies.
- Scales: from 1 mg to 1 gram or more, depending on the project
- Purities: from crude to >98% (HPLC)
- Modifications: phosphorylation, biotinylation, fluorescent labels, cyclization, and more
- Terminal modifications: N-terminal acetylation and C-terminal amidation
- Quality control: HPLC and mass spectrometry for each peptide
- Documentation: Certificate of Analysis provided with every order
Exact specifications depend on the peptide sequence and the service tier selected. Researchers should confirm available options and turnaround times when requesting a quote. Some sequences require special synthesis strategies, and not every modification is compatible with every peptide.
Key Specifications at a Glance
| Feature | Typical Options | Why It Matters |
|---|---|---|
| Scale | 1 mg to 1 g+ | Larger scales support in vivo or large screening projects |
| Purity | Crude, >70%, >80%, >90%, >95%, >98% | Higher purity reduces interference in sensitive assays |
| Modifications | Phospho, biotin, fluorescent dyes, amidation, acetylation, cyclization | Modifications enable labeling, conjugation, or stability |
| Peptide length | Up to ~50 amino acids (standard) | Longer sequences may require special synthesis and higher cost |
| Turnaround | 1–3 weeks for standard orders | Complex or modified peptides may take longer |
| Documentation | Certificate of Analysis (CoA), HPLC, MS | CoA confirms identity and purity for publication and audits |
Custom Peptide Synthesis is a broad category that includes many providers, and sigma custom peptide synthesis is one of several options. Many labs also use a custom peptide synthesis service from other suppliers depending on budget, sequence complexity, and timeline. Some researchers compare sigma custom peptide synthesis with custom peptide synthesis thermo fisher when selecting a vendor. Regional preferences also matter: a lab in Europe might search for custom peptide synthesis uk, while a group in Australia might look for custom peptide synthesis australia.
Understanding Purity Levels for Custom Peptides
Purity is one of the most important choices when ordering custom peptides. Crude peptides contain many truncated or deletion sequences and are best for preliminary screening. Higher purity levels are recommended for assays where impurities could affect results, such as receptor binding or cell-based studies.
| Purity Level | Typical Use Case |
|---|---|
| Crude | Initial screening, non-sensitive applications |
| >70–80% | General biochemical assays |
| >90–95% | Antibody production, ELISA, receptor studies |
| >98% | Structural studies, sensitive cell-based assays |
For most research applications, >95% purity is sufficient. Researchers should match purity to the sensitivity of their assay and the purpose of the experiment. Ordering higher purity than needed increases cost without improving results.
How to Order Sigma Custom Peptides
Ordering custom peptides from MilliporeSigma usually involves submitting a sequence, selecting purity and scale, and requesting any modifications. MilliporeSigma provides an online ordering portal and technical support to help with difficult sequences. Researchers should review the quotation carefully, as price and turnaround depend on length, purity, and modifications.
- Enter your peptide sequence and any modifications.
- Choose scale, purity, and quantity.
- Request a quote or place the order.
- Receive the peptide with a Certificate of Analysis.
- Store lyophilized peptides at -20°C, protected from light and moisture.
Turnaround Times and Ordering Tips
Standard orders typically ship within 1–3 weeks. Complex modifications, long sequences, or high-purity requirements can extend the timeline. Researchers should plan ahead and request a quote early, especially for grant deadlines or time-sensitive experiments.
- Provide the exact sequence and desired modifications.
- Specify the required purity and scale.
- Ask about rush options if available.
- Request a Certificate of Analysis in advance.
- Confirm shipping and storage conditions.
Quality Control and Safety Considerations
The custom peptide synthesis process includes quality control steps such as HPLC and mass spectrometry. Each peptide typically arrives with a Certificate of Analysis that reports purity and molecular weight. Researchers should verify the CoA before using peptides in downstream experiments.
MilliporeSigma custom peptides are not FDA-approved for human use. Custom peptides from MilliporeSigma are research chemicals, not drugs, supplements, or treatments. Anyone considering peptides for personal health reasons should consult a licensed healthcare professional. Self-experimentation with research peptides can be dangerous because purity, sterility, and dosing are not controlled.
Common Applications of Custom Peptides
- Antibody production and epitope mapping
- Receptor binding studies
- Enzyme substrate assays
- Vaccine development research
- Drug discovery and screening
- Structural biology (NMR, crystallography)
Not all sequences synthesize well. Long, hydrophobic, or highly repetitive peptides may have lower yields or require special handling. Sigma and other vendors may recommend alternative sequences or synthesis strategies when a sequence is problematic.
Regional and International Considerations
MilliporeSigma operates globally, but researchers in different countries may face different shipping times, import regulations, and customs procedures. Some labs search for local suppliers in the UK, India, China, or Australia to reduce shipping time and cost. Shipping peptides across borders may require documentation, and some countries have specific rules for research chemicals.
Sigma vs. Other Custom Peptide Synthesis Providers
| Provider | Typical Strengths | Considerations |
|---|---|---|
| MilliporeSigma (Sigma-Aldrich) | Broad catalog, global support, integrated research portfolio | Custom peptide service may be one part of a larger offering |
| Thermo Fisher | Large portfolio, competitive pricing, online tools | Similar research-use restrictions apply |
| Specialty peptide companies | Focused expertise, flexible modifications, fast turnaround | Quality and documentation vary by vendor |
Many labs compare sigma custom peptide synthesis with other providers before ordering. The best choice depends on sequence complexity, required purity, budget, and timeline. International orders may involve additional shipping, customs, and regulatory considerations.
Key Takeaways for Researchers
- Sigma custom peptide synthesis is a research-use-only service from MilliporeSigma.
- Purity, scale, and modifications should match the intended assay.
- Certificates of Analysis are essential for quality control.
- International orders may require additional planning.
- Custom peptides are not approved for human use.
Frequently Asked Questions
Is Sigma custom peptide synthesis for human use?
No. MilliporeSigma custom peptides are sold for research use only. They are not FDA-approved for human or veterinary use. Anyone considering peptides for health reasons should consult a licensed healthcare professional.
How long does Sigma custom peptide synthesis take?
Standard orders typically ship within 1–3 weeks. Complex modifications, long sequences, or high-purity requirements can extend the timeline. Researchers should request a quote for a specific turnaround estimate.
What purity should I choose for custom peptides?
Purity depends on the assay. Crude peptides work for initial screening. For antibody production or receptor studies, choose >90–95% purity. For sensitive cell-based or structural work, >98% is recommended.
This page provides educational research information and does not replace medical advice, diagnosis, or treatment.