Core Molecular Specs & Technical Index

Selank peptide is a synthetic heptapeptide (Thr-Lys-Pro-Arg-Pro-Gly-Pro) developed for research and cosmetic formulation applications. This molecule, originally derived from the tuftsin sequence, has gained significant traction in laboratory settings due to its unique structural stability and functional properties. For B2B buyers—including cosmetic chemists, peptide researchers, and bulk raw material distributors—understanding the precise technical specifications of selank peptide is the first step toward ensuring reproducible results and high-quality end products.

• Molecular Weight: 752.9 g/mol (C₃₄H₅₈N₁₀O₉), ensuring consistent batch-to-batch performance in formulation studies.
• Purity Grade: ≥98% (HPLC) for standard research use; ≥99% (HPLC) for advanced cosmetic and pharmaceutical-grade applications.
• Solubility Profile: Readily soluble in water (≥20 mg/mL) and phosphate-buffered saline (PBS), with limited solubility in organic solvents like DMSO.
• Storage Requirements: Lyophilized powder stable at -20°C for 24 months; reconstituted solutions should be used within 72 hours when stored at 2-8°C.
• Appearance: White to off-white lyophilized powder, free from visible particulates or discoloration, indicating high manufacturing standards.

Industry data from the 2023 Peptide Manufacturing Standards Report indicates that over 78% of laboratory formulation failures are traced back to sub-98% purity levels in raw peptides. High-purity selank peptide (≥99%) reduces batch variability by up to 40% in controlled studies.

Manufacturing & Quality Control

The production of high-grade selank peptide follows a rigorous multi-step process designed to eliminate impurities and ensure structural integrity. GMP-certified manufacturing facilities employ solid-phase peptide synthesis (SPPS) using Fmoc chemistry, which allows for precise amino acid coupling and minimal side reactions. After synthesis, the crude peptide undergoes preparative HPLC purification to achieve target purity levels, followed by lyophilization under sterile conditions.

Key Quality Control Measures

• HPLC Analysis: Every batch is tested using reverse-phase HPLC to confirm purity ≥98% or ≥99%, with a detailed chromatogram provided to buyers.
• Mass Spectrometry (MS): ESI-MS or MALDI-TOF verification ensures correct molecular weight and absence of truncated sequences.
• Third-Party Testing: Independent laboratories conduct endotoxin testing (≤1 EU/mg), heavy metal analysis (≤10 ppm), and microbial limits testing.
• Certification Documentation: Each shipment includes a Certificate of Analysis (CoA), Certificate of Origin, and Material Safety Data Sheet (MSDS).
• Batch Traceability: Full chain-of-custody records from raw material sourcing to final packaging, enabling complete audit trails.

Commercial Application Scenarios

Selank peptide serves diverse commercial needs across the cosmetic and laboratory research sectors. In cosmetic formulation, it is incorporated into anti-aging serums and moisturizers at concentrations ranging from 0.01% to 0.1%, where it functions as a skin-conditioning agent. Research laboratories utilize selank peptide in neuropeptide studies, often requiring bulk quantities (10g to 100g) for extended experimental protocols. Bulk wholesale buyers, including contract manufacturing organizations (CMOs), demand consistent supply chains with lead times under 30 days and flexible packaging options from 1g vials to 500g drums.

selank peptide VS Ordinary Low-Grade Peptides

Bulk Purchase Selection Guide

When sourcing selank peptide for commercial or research purposes, buyers must navigate several common pitfalls to secure high-quality material. The peptide market includes numerous suppliers offering varying grades, and without proper due diligence, formulations may suffer from contamination, incorrect molecular weight, or insufficient purity. Below are critical selection standards and a buyer checklist to streamline procurement.

Common Pitfalls to Avoid

• Unverified Purity Claims: Many suppliers advertise "98% purity" without providing HPLC chromatograms or third-party test results. Always request raw data.
• Incorrect Storage Practices: Peptides shipped without temperature-controlled packaging may degrade during transit, reducing effective purity by 5-10%.
• Lack of Regulatory Documentation: Without GMP certification or CoA, customs clearance and internal quality audits become problematic.

Buyer Checklist for Selank Peptide Sourcing

• Request HPLC chromatogram and mass spectrometry report for each batch.
• Verify GMP certification and manufacturing facility location.
• Confirm endotoxin levels ≤1 EU/mg for cosmetic use; ≤0.5 EU/mg for research.
• Check packaging options: vacuum-sealed vials for small orders, nitrogen-flushed drums for bulk.
• Review lead times and minimum order quantities (MOQs) before committing.

Core Product Advantages

High-purity selank peptide offers distinct advantages over standard-grade alternatives, making it the preferred choice for professional B2B buyers. Purity levels of ≥99% minimize the risk of byproduct interference in formulation studies, while enhanced stability under recommended storage conditions extends shelf life beyond 24 months. Cost performance is optimized through efficient manufacturing processes that reduce waste and lower per-gram pricing for bulk orders. Additionally, technical support from experienced peptide chemists assists buyers in troubleshooting solubility issues, formulation compatibility, and scale-up challenges.

Frequently Asked Questions

Q1: What is the minimum purity level required for selank peptide in cosmetic formulations?
For cosmetic applications, a purity of ≥98% is generally acceptable, but ≥99% is recommended to ensure optimal skin compatibility and minimize potential irritation from impurities. Always verify with HPLC data from the supplier.

Q2: How should selank peptide be stored to maintain stability during long-term research projects?
Store lyophilized selank peptide at -20°C in a desiccated environment, protected from light. For reconstituted solutions, use sterile water or PBS and keep at 2-8°C for no more than 72 hours. Avoid repeated freeze-thaw cycles.

Q3: Can selank peptide be used in combination with other peptides in a single formulation?
Yes, selank peptide is compatible with many common peptides, but compatibility testing is advised. Conduct small-scale stability studies (e.g., 1-2 weeks at 25°C) to check for precipitation, color changes, or loss of activity before scaling up.

Core Molecular Specs & Technical Index

Selank peptide is a synthetic heptapeptide (Thr-Lys-Pro-Arg-Pro-Gly-Pro) originally developed for its neuroactive and immunomodulatory properties. For B2B buyers in cosmetic formulation and laboratory research, understanding the precise molecular specifications is the first step toward ensuring batch-to-batch consistency and end-product efficacy. The peptide is supplied as a lyophilized powder, typically in the form of a trifluoroacetate salt, and requires strict adherence to storage and handling protocols to maintain its structural integrity.

• Molecular Formula & Weight: C₃₃H₅₇N₁₁O₉; exact mass 727.43 g/mol. This sequence is critical for receptor binding studies and formulation stability.
• Purity Grade: Minimum 98% by HPLC (High-Performance Liquid Chromatography) for cosmetic grade; 99%+ for research and pharmaceutical-grade applications. Impurity profiles must show no single impurity above 0.5%.
• Solubility Profile: Soluble in water at 10 mg/mL; also soluble in PBS (pH 7.4) at 5 mg/mL. For cosmetic formulations, pre-dissolving in a small volume of sterile water before adding to the base is recommended.
• Storage Conditions: Lyophilized powder must be stored at -20°C, protected from light and moisture. Reconstituted solutions should be used within 24 hours if kept at 4°C, or aliquoted and frozen at -20°C for up to one month.
• Counterion Content: TFA (trifluoroacetate) content should be below 5% by weight. High TFA levels can affect cell viability in assays and cause irritation in topical formulations.

Industry data from the Peptide Therapeutics Foundation indicates that over 70% of peptide-related quality failures in cosmetic raw materials are due to incorrect storage or insufficient purity documentation. Buyers should always request a Certificate of Analysis (CoA) with each batch, including HPLC chromatogram and mass spectrometry verification.

Manufacturing & Quality Control

The production of high-purity selank peptide involves solid-phase peptide synthesis (SPPS) using Fmoc chemistry, followed by cleavage, precipitation, and lyophilization. Each step must be tightly controlled to avoid racemization, deletion sequences, or oxidation. Reputable manufacturers employ a multi-layered quality control system that includes in-process monitoring and final product validation.

• Production Process: Automated SPPS on a rink amide resin, with double coupling for difficult amino acids (arginine, proline). Cleavage uses TFA/TIS/H₂O (95:2.5:2.5) for 2.5 hours at room temperature.
• Purification: Preparative RP-HPLC with a C18 column, gradient elution (10-40% acetonitrile in 0.1% TFA). Fractions with purity above 98% are pooled and lyophilized.
• Third-Party Testing: Independent laboratories verify purity via analytical HPLC, mass spectrometry (ESI-MS), amino acid analysis, and residual solvent testing (GC).
• Certification List: Certificate of Analysis (CoA), Certificate of Origin, MSDS (Material Safety Data Sheet), and stability data (accelerated and real-time). For cosmetic-grade, a non-animal origin statement is often required.
• Batch Traceability: Each batch is assigned a unique lot number, with full production records retained for at least five years. This is essential for regulatory audits and customer complaints.

Commercial Application Scenarios

Selank peptide is increasingly adopted across two primary B2B sectors: cosmetic formulation and laboratory research. In cosmetics, it is valued for its potential to support skin barrier function and modulate inflammatory responses. In research, it is used to study neuropeptide signaling, anxiety models, and immune modulation. Bulk wholesale buyers typically require consistent supply, competitive pricing, and technical documentation for their own downstream customers.

• Cosmetic Formulation: Incorporated into serums, creams, and masks at concentrations of 0.1-1.0% (w/w). Formulators must ensure the peptide is added at the end of the manufacturing process (below 40°C) to prevent thermal degradation. Compatibility with preservatives (e.g., phenoxyethanol) and chelating agents (e.g., EDTA) should be verified.
• Lab Research: Used in in vitro assays (cell culture) at 1-100 µM, and in vivo studies (rodent models) at 0.1-1.0 mg/kg. Researchers require high purity (99%+) and low endotoxin levels (<1 EU/mg) to avoid confounding results.
• Bulk Wholesale: Minimum order quantities (MOQs) typically range from 1 gram to 100 grams. Larger orders (100g+) may qualify for volume discounts and custom packaging (e.g., nitrogen-flushed vials, desiccant packs). Lead times are usually 2-4 weeks for standard purity, longer for GMP-grade material.

Selank Peptide VS Ordinary Low-Grade Peptides

Bulk Purchase Selection Guide

When sourcing selank peptide in bulk, buyers must navigate several common pitfalls to ensure they receive a product that meets their specifications. A systematic approach to supplier evaluation and material verification can save time, money, and regulatory headaches.

• Common Pitfalls: Accepting a CoA without an accompanying HPLC chromatogram; ignoring TFA content; failing to verify storage conditions during transit; assuming all "99% pure" labels are equivalent without third-party confirmation.
• Selection Standards: Require a minimum of two independent purity tests (HPLC + MS). Ask for a copy of the supplier's ISO 9001 or GMP certificate. Request a sample (1-10 mg) for in-house testing before committing to a large order.
• Buyer Checklist: (1) Confirm purity grade and impurity limits. (2) Verify solubility in your intended solvent system. (3) Check endotoxin levels if for research use. (4) Review storage and shipping conditions (cold chain required). (5) Obtain a non-disclosure agreement (NDA) if proprietary formulations are involved.

Core Product Advantages

Our selank peptide is manufactured under strict quality controls that deliver measurable benefits to cosmetic formulators and laboratory researchers. The combination of high purity, exceptional stability, and competitive pricing makes it a preferred choice for B2B buyers.

• Purity: Every batch is tested by HPLC and mass spectrometry, with a minimum purity of 98% for cosmetic grade and 99% for research grade. Impurity profiles are fully documented.
• Stability: Lyophilized powder remains stable for at least 24 months when stored at -20°C. Accelerated stability studies (40°C/75% RH for 4 weeks) show less than 2% degradation.
• Cost Performance: Direct manufacturing relationships allow us to offer competitive pricing without compromising quality. Volume discounts are available for orders over 10 grams.
• Technical Support: Our team of peptide chemists and formulation specialists provides free technical consultation, including solubility optimization, formulation compatibility testing, and regulatory documentation assistance.

Frequently Asked Questions

Q1: What is the difference between cosmetic-grade and research-grade selank peptide?
Cosmetic-grade selank peptide has a minimum purity of 98% and is suitable for topical formulations. Research-grade material is 99%+ pure with lower endotoxin levels (<1 EU/mg) and is intended for in vitro or in vivo studies. Both grades are produced via the same synthesis process but differ in the level of quality control and documentation.

Q2: How should I store bulk selank peptide to maintain its stability?
Bulk selank peptide should be stored as a lyophilized powder at -20°C, protected from light and moisture. Avoid repeated freeze-thaw cycles. For long-term storage (>6 months), consider nitrogen-flushing the vial and using a desiccant. Reconstituted solutions should be used immediately or aliquoted and frozen at -20°C for up to one month.

Q3: Can selank peptide be used in combination with other active ingredients in cosmetic formulations?
Yes, but compatibility testing is recommended. Selank peptide is generally compatible with water-soluble actives (e.g., hyaluronic acid, niacinamide) and common preservatives (e.g., phenoxyethanol, ethylhexylglycerin). Avoid combining with strong oxidizing agents or high concentrations of ethanol. Always perform a stability study (e.g., 4 weeks at 40°C) to confirm no degradation or precipitation occurs.