GenScript peptide services cover custom peptide synthesis, modifications, and libraries for research. Learn what to expect, turnaround times, quality checks.
GenScript peptide services are custom peptide synthesis offerings from GenScript Biotech, a life sciences supplier that manufactures made-to-order peptides for laboratory research. A researcher submits a sequence, chooses a purity level and quantity, and receives a lyophilized peptide with analytical documentation. GenScript peptides are sold for research use only and are not intended for human or veterinary use.
What GenScript Peptide Services Cover
GenScript runs one of the larger commercial peptide synthesis platforms, so the service list goes well beyond a standard 15-mer. Most orders fall into a few categories.
- Custom single peptides: sequences of roughly 5 to 50+ amino acids, delivered in milligram to multi-gram quantities.
- Chemical modifications: phosphorylation, acetylation, amidation, biotinylation, fluorescent labels such as FITC or FAM, PEGylation, cyclization, disulfide bridges, and unnatural amino acids.
- Peptide libraries: overlapping, alanine-scanning, positional-scanning, and random libraries used for epitope mapping and screening.
- Immunogen peptides: carrier-protein conjugation with KLH, BSA, or OVA for antibody production.
- Scale-up and supporting products: bulk peptide synthesis, peptide arrays, and custom conjugates.
Ordering happens through an online quote tool. You paste a sequence, pick purity and quantity, and the system returns a price and estimated delivery window before synthesis begins.
Purity Grades and How They Affect Cost
Purity is the biggest cost driver after sequence length. GenScript lists several standard grades, and each suits a different kind of experiment.
| Purity grade | Typical use | Notes |
|---|---|---|
| Crude / desalted | Initial screening and library work | Lowest cost; contains truncated sequences |
| >70% | Non-quantitative screening | Budget option when exact mass matters less |
| >95% | ELISA, binding assays, cell culture | The default choice for most labs |
| >98% | Sensitive cell assays, structural work, animal research | Highest standard grade; requires HPLC purification |
Quotes scale with amino acid count, purity, quantity, and modification complexity, so the same sequence can vary widely in price. Short, unmodified peptides at crude purity are the cheapest per milligram, while long, labeled, or cyclized sequences at 98% purity can cost several times more.
Turnaround Time, Documentation, and Quality Control
Most standard, unmodified peptides ship within one to three weeks, and simple sequences can move faster. Long, modified, or difficult sequences take more time because they require extra purification and re-analysis.
Every order arrives with a certificate of analysis. Expect the following data:
- HPLC chromatogram with a reported purity percentage
- Mass spectrometry results confirming molecular weight
- Net peptide content and counter-ion information
- Appearance, solubility guidance, and storage recommendations
Peptides typically arrive as a lyophilized powder. Store them desiccated at -20 °C, let vials warm to room temperature before opening, and avoid repeated freeze-thaw cycles that degrade the sequence.
How GenScript Compares with Other Peptide Synthesis Suppliers
GenScript competes with university core facilities, specialty custom peptide companies, and large distributors. The right choice depends on scale, timeline, and the documentation you need.
| Supplier type | Typical purity range | Turnaround | Best for |
|---|---|---|---|
| GenScript | Crude to >98% | Often 1-3 weeks | Routine research peptides ordered online |
| University core facility | Usually up to >95% | Varies, often slower | Local labs with simple sequences |
| Specialty custom peptide companies | Up to >98%, plus GMP grades | Longer for complex work | Difficult chemistries and clinical-stage programs |
GenScript also advertises GMP peptide manufacturing for preclinical and clinical programs, and researchers should confirm the regulatory scope directly with the company. For everyday bench work, the deciding factors are usually price per milligram, purity accuracy, and how quickly a quote turns into a shipped vial.
Research Peptides vs. Consumer Peptide Products
A research-grade peptide is not the same product as a peptide serum sold in the beauty aisle or a hydrolyzed collagen peptide supplement sold as a food. Research peptides are defined sequences with measured purity, while cosmetics and supplements are formulated for topical or oral use and regulated under different rules.
That distinction matters when people look for peptide information online. A researcher ordering an aod9604 peptide for a metabolic study needs a certificate of analysis and a known molecular weight, not a marketing label. In the same way, when a student asks what does glucagon-like peptide 1 do, the answer comes from controlled experiments with characterized peptides rather than from product packaging.
Ordering Tips, Storage, and Safety Notes
- Confirm the exact sequence, including N- and C-terminal modifications, before you order.
- Choose the lowest purity that meets your assay. A grade of 95% covers most in vitro work, while 98% is standard for sensitive cell-based and in vivo research.
- Request a sample certificate of analysis so you know what data will ship with the peptide.
- Plan a solubility test in water, PBS, or DMSO on a small aliquot before using the full vial.
- Order a small pilot quantity of any complex sequence before committing to bulk synthesis.
Handle peptides with standard laboratory precautions, keep them out of food and cosmetic use, and follow your institution's safety and animal care requirements for any in vivo study.
GenScript peptides are research tools rather than therapeutics, and no supplier relationship replaces the judgment of a qualified researcher or healthcare professional when human health questions come up.
Frequently Asked Questions
Are GenScript peptides for human use?
No. Peptides sold by GenScript are labeled for research use only and are not intended for human or veterinary use, diagnostic procedures, or food and cosmetic applications. Researchers who need clinical-grade material must work with a GMP manufacturer and follow the appropriate regulatory pathway.
How long does GenScript take to deliver a custom peptide?
Most standard, unmodified peptides ship within roughly one to three weeks after order confirmation, and some simple sequences move faster. Long sequences, unusual modifications, and the highest purity grades typically add time because they require extra purification and re-analysis.
What purity should I choose for a custom peptide order?
For routine in vitro work such as ELISA, binding assays, or cell culture, 95% purity or higher is standard. Choose 98% or higher for sensitive cell-based assays, structural studies, or animal research, and crude or 70% grades for early screening where exact purity matters less.
This page provides educational research information and does not replace medical advice, diagnosis, or treatment.