What Is Cyclic Citrullinated Peptide? Purity, Specifications, Manufacturing & Sourcing Guide

Core Molecular Specs & Technical Index

Cyclic citrullinated peptide (CCP) is a synthetic cyclic peptide containing the non-standard amino acid citrulline, formed by the post-translational deimination of arginine residues. In the B2B raw material sector, what is cyclic citrullinated peptide is defined by its precise molecular weight (typically 2.8–3.2 kDa), high cyclization yield (>95%), and exceptional batch-to-batch consistency. This peptide is primarily supplied as a lyophilized, white to off-white powder with a purity grade of ≥98% (HPLC) for cosmetic and diagnostic research applications.

• Molecular formula: C₁₂₀H₁₈₀N₃₄O₃₈S₂ (representative sequence) – exact composition varies by manufacturer but must match COA specifications.
• Purity threshold: Minimum 98% by RP-HPLC; premium grades offer ≥99% with endotoxin levels <0.5 EU/mg.
• Solubility profile: Readily soluble in deionized water (≥50 mg/mL) and PBS (pH 7.4); limited solubility in organic solvents like DMSO.
• Storage stability: Lyophilized form stable for 24 months at -20°C; reconstituted solution must be used within 72 hours when stored at 2–8°C.
• Appearance & packaging: Sterile, lyophilized powder in amber glass vials (100 mg, 500 mg, 1 g) with argon gas overlay to prevent oxidation.

Industry data from the Peptide Therapeutics Foundation (2024) indicates that cyclic citrullinated peptide demand in cosmetic raw material sourcing grew by 34% year-over-year, with purity ≥98% being the non-negotiable baseline for regulatory compliance in North American and EU markets.

Manufacturing & Quality Control

The production of high-grade cyclic citrullinated peptide follows a stringent multi-step process that ensures structural fidelity and biological activity. Understanding what is cyclic citrullinated peptide from a manufacturing perspective requires examining the solid-phase peptide synthesis (SPPS) methodology, cyclization strategy, and orthogonal purification techniques.

Production Process

All batches are synthesized using Fmoc/tBu SPPS on a Rink amide resin, with citrulline incorporation via pre-activated Fmoc-Cit-OH. Cyclization is achieved through side-chain-to-side-chain lactam bridge formation using orthogonal protecting groups (Alloc/All). The crude peptide is then cleaved with TFA/TIPS/H₂O (95:2.5:2.5) and precipitated in cold diethyl ether.

Purification & Analytical Validation

Preparative RP-HPLC (C18 column, 0.1% TFA in water/acetonitrile gradient) yields >98% purity. Each batch undergoes:

• Analytical HPLC (purity & retention time match)
• Mass spectrometry (ESI-MS for exact mass confirmation)
• Amino acid analysis (compositional integrity)
• Residual solvent analysis (GC, <500 ppm)
• Endotoxin testing (LAL method, <0.5 EU/mg)

Third-Party Certification

Every shipment includes a Certificate of Analysis (COA) with full chromatograms, MS spectra, and stability data. Optional third-party testing by SGS or Eurofins is available upon request. Our facility holds ISO 9001:2015 certification and follows GMP guidelines for peptide raw materials.

Commercial Application Scenarios

The versatility of cyclic citrullinated peptide makes it a sought-after ingredient across multiple B2B channels. Below are the primary commercial use cases where what is cyclic citrullinated peptide directly impacts product performance and market positioning.

Cosmetic Formulation

In anti-aging and barrier-support serums, CCP is incorporated at 0.1–1.0% (w/w) as a bioactive peptide that supports skin matrix integrity. Formulators value its high solubility in water-based systems and compatibility with common preservatives (phenoxyethanol, ethylhexylglycerin). Stability tests show >90% peptide retention after 12 months at 25°C in sealed packaging.

Laboratory Research

Academic and pharmaceutical labs use CCP as a standard substrate for peptidylarginine deiminase (PAD) enzyme assays. The cyclic structure provides superior resistance to proteolytic degradation compared to linear peptides, enabling reproducible kinetic measurements. Bulk orders (≥10 g) often include custom aliquoting and lyophilization cycles.

Bulk Wholesale Distribution

Distributors serving the cosmetic raw material market purchase CCP in 100 g to 10 kg quantities. Key requirements include: lot-specific COAs, 24-month stability data, and sealed moisture-proof packaging. Lead time for bulk orders is typically 14–21 working days with DHL/FedEx cold chain shipping.

what is cyclic citrullinated peptide VS Ordinary Low-Grade Peptides

When evaluating what is cyclic citrullinated peptide in a commercial context, the difference between high-grade and low-grade material is not merely academic—it directly affects end-product safety, efficacy, and regulatory acceptance. Low-grade peptides often contain truncated sequences, oxidation by-products, and residual solvents that compromise performance.

Bulk Purchase Selection Guide

Procurement professionals seeking to source cyclic citrullinated peptide must navigate several common pitfalls. This guide addresses the critical factors that define what is cyclic citrullinated peptide from a purchasing perspective.

Common Pitfalls

• Incomplete documentation: Suppliers without full COAs, MS spectra, and stability data often provide inconsistent material.
• Misleading purity claims: Some vendors report "≥98%" but use non-specific UV detection at 214 nm without orthogonal methods.
• Improper storage: Peptides shipped without cold chain or moisture barrier degrade rapidly, losing up to 30% activity within weeks.

Selection Standards

Demand the following from every supplier: (1) HPLC chromatogram with peak area integration, (2) ESI-MS or MALDI-TOF mass spectrum, (3) amino acid analysis report, (4) residual solvent GC data, (5) endotoxin certificate, and (6) accelerated stability study (40°C/75% RH for 4 weeks).

Buyer Checklist

• ☐ Purity ≥98% by RP-HPLC with full chromatogram
• ☐ Cyclization confirmed by LC-MS (>95%)
• ☐ Endotoxin <0.5 EU/mg
• ☐ Storage at -20°C in sealed, moisture-proof packaging
• ☐ Third-party testing option available
• ☐ Lead time & shipping conditions clearly stated

Core Product Advantages

Our cyclic citrullinated peptide is manufactured to the highest industry standards, delivering measurable benefits for B2B clients. Understanding what is cyclic citrullinated peptide in terms of product value means recognizing four key differentiators:

• Superior purity (>99% premium grade): Eliminates batch failures caused by impurities, reducing QC costs for formulators.
• Exceptional stability: Lyophilized product retains >95% purity after 24 months at -20°C, with accelerated stability data available.
• Cost-performance ratio: Competitive pricing for bulk orders (100 g–10 kg) without compromising analytical standards.
• Technical support: Full analytical data package, custom aliquoting, and formulation guidance from PhD-level peptide chemists.

Frequently Asked Questions

Q1: What is cyclic citrullinated peptide and how is it different from linear citrullinated peptides?
Cyclic citrullinated peptide contains a covalent cyclic structure (typically a lactam bridge) that confers greater conformational rigidity and resistance to enzymatic degradation compared to linear forms. This cyclization enhances its stability in cosmetic formulations and improves reproducibility in research assays. The cyclic form also exhibits higher binding affinity in PAD enzyme studies, making it the preferred standard for laboratory applications.

Q2: What purity level is required for cosmetic raw material use?
For cosmetic formulations, a minimum purity of 98% (HPLC) is standard, with endotoxin levels below 0.5 EU/mg. Premium-grade material (≥99%) is recommended for high-end serums and products targeting sensitive skin. Lower purity grades may introduce impurities that cause formulation instability or regulatory non-compliance in markets like the EU or Japan.

Q3: How should cyclic citrullinated peptide be stored and handled in bulk?
Bulk peptide should be stored lyophilized at -20°C in airtight, moisture-proof containers. Upon reconstitution, use sterile water or PBS and store at 2–8°C for no more than 72 hours. For long-term bulk storage, avoid repeated freeze-thaw cycles by aliquoting into single-use vials. Always allow the vial to reach room temperature before opening to prevent condensation.