MT-II Peptide Purity Specifications and Manufacturing Standards for Cosmetic Formulation Sourcing

Core Molecular Specs & Technical Index

MT-II peptide, also known as Melanotan II, is a synthetic cyclic tridecapeptide analog of the naturally occurring melanocyte-stimulating hormone (α-MSH). For B2B buyers in cosmetic formulation and laboratory research, the core value of MT-II peptide lies in its high-purity, precisely sequenced structure that enables consistent performance in topical and experimental applications. Sourcing professionals require exacting specifications to ensure batch-to-batch reproducibility and formulation stability.

The fundamental technical parameters for premium MT-II peptide include:

• Molecular Formula: C50H69N15O9, with a molecular weight of 1024.2 g/mol, ensuring a defined active sequence for reliable bioactivity in cosmetic blends.
• Purity Grade: ≥98% by HPLC analysis, with premium grades reaching 99.5%+ to minimize by-products and ensure formulation safety.
• Appearance: White to off-white lyophilized powder, free-flowing and easily reconstituted in sterile water or buffer solutions.
• Solubility: Soluble in water at 10 mg/mL, with optimal reconstitution in 0.9% saline or phosphate-buffered saline for consistent dosing.
• Storage Conditions: Lyophilized powder stable at -20°C for 24 months; reconstituted solution stable at 2-8°C for 7 days, avoiding repeated freeze-thaw cycles.

Industry data from the Peptide Therapeutics Foundation indicates that over 85% of cosmetic peptide sourcing failures stem from sub-98% purity levels, leading to formulation instability and reduced efficacy. Premium MT-II peptide with ≥99% purity reduces batch rejection rates by 40% in commercial production.

Manufacturing & Quality Control

The production of high-grade MT-II peptide follows a rigorous multi-step process designed to eliminate impurities and ensure molecular integrity. Manufacturing begins with solid-phase peptide synthesis (SPPS) using Fmoc chemistry, which allows precise amino acid coupling and minimizes deletion sequences. After cleavage from the resin, the crude peptide undergoes cyclization to form the critical disulfide bridge between Cys4 and Cys10, essential for structural stability.

Purification employs preparative reverse-phase high-performance liquid chromatography (RP-HPLC) with C18 columns, achieving baseline separation of target peptide from truncated and oxidized variants. Final product is lyophilized under controlled conditions to preserve bioactivity and prevent moisture absorption. Quality control includes:

• HPLC Analysis: Confirms purity ≥98% with retention time consistency across batches.
• Mass Spectrometry (MS): Validates molecular weight within ±0.5 Da of theoretical value.
• Amino Acid Analysis: Ensures correct sequence composition and absence of racemization.
• Endotoxin Testing: Meets ≤0.5 EU/mg limit for cosmetic-grade applications.
• Certification: COA (Certificate of Analysis) provided per batch, including HPLC chromatogram and MS spectrum.

Commercial Application Scenarios

MT-II peptide serves diverse B2B needs across cosmetic formulation, laboratory research, and bulk wholesale distribution. In cosmetic manufacturing, it is incorporated into serums, creams, and masks at concentrations of 0.01%–0.1% w/w, requiring precise weighing and cold-chain logistics to maintain stability. Formulators value its consistent solubility and lack of aggregation, enabling clear, elegant end products.

For laboratory research, MT-II peptide is used as a positive control in melanogenesis assays and receptor-binding studies. Researchers require high-purity material with documented batch data to ensure experimental reproducibility. Bulk wholesale buyers, such as contract manufacturers and ingredient distributors, demand large quantities (10g–1kg) with uniform quality, competitive pricing, and reliable lead times. Typical usage includes:

• Cosmetic Formulation: 0.05% MT-II peptide in anti-aging serums, combined with antioxidants and hyaluronic acid.
• Lab Research: 1 mg/mL stock solutions for cell culture assays, stored at -80°C for long-term use.
• Bulk Wholesale: 100g–500g orders for private-label brands, with custom packaging and documentation.

mt-ii peptide VS Ordinary Low-Grade Peptides

Bulk Purchase Selection Guide

When sourcing MT-II peptide for commercial use, buyers must navigate common pitfalls to ensure quality and value. The most frequent issues include receiving low-purity material (below 95%), incorrect molecular weight due to incomplete cyclization, and missing documentation for regulatory compliance. To avoid these, follow a structured selection process:

• Verify Purity: Request HPLC chromatogram showing main peak area ≥98% and absence of significant impurity peaks.
• Check Solubility: Test a small sample in water at 10 mg/mL; a clear solution indicates proper cyclization and minimal aggregates.
• Review Certifications: Ensure COA includes MS confirmation, amino acid analysis, and endotoxin results.
• Assess Supplier: Look for GMP-compliant facilities with ISO 9001 certification and positive client references.
• Evaluate Logistics: Confirm cold-chain shipping with temperature data loggers for lyophilized powder.

A buyer checklist should include: purity specification, batch number, expiration date, storage conditions, and contact for technical support. Always request a sample batch before committing to large orders.

Core Product Advantages

Our MT-II peptide offers distinct benefits for B2B buyers seeking reliable raw materials. Purity is the foundation: every batch is tested by HPLC and MS, guaranteeing ≥99% purity with full traceability. This eliminates formulation failures caused by unknown impurities and ensures consistent performance across production runs.

Stability is engineered through optimized lyophilization and packaging in argon-flushed vials, preventing oxidation and moisture uptake. The peptide remains stable at -20°C for 24 months, with reconstituted solutions maintaining activity for 7 days under refrigeration. Cost performance is achieved by direct manufacturing without intermediaries, offering competitive pricing for bulk orders (10g–1kg) without compromising quality.

Technical support includes detailed formulation guidance, custom packaging options, and rapid response to inquiries. Our team provides COA, MSDS, and stability data upon request, enabling seamless integration into your production workflow.

Frequently Asked Questions

Q1: What is the minimum purity required for MT-II peptide in cosmetic formulations?
For cosmetic applications, we recommend ≥98% purity by HPLC to ensure formulation stability and minimize irritation risks. Our standard product meets ≥99% purity, providing an extra safety margin for sensitive formulations.

Q2: How should MT-II peptide be stored to maintain stability during bulk storage?
Store lyophilized MT-II peptide at -20°C in a desiccated environment, protected from light. Avoid repeated freeze-thaw cycles; aliquot reconstituted solutions into single-use vials and refrigerate at 2-8°C for up to 7 days.

Q3: Can MT-II peptide be used in water-based cosmetic products without preservatives?
Yes, MT-II peptide is water-soluble and compatible with aqueous formulations. However, we recommend using preservatives or packaging in sterile, single-dose containers to prevent microbial growth, as the peptide itself does not have antimicrobial properties.