Peptides Purity

 By Peptide Information      May 1, 2025

ALL ARTICLES AND PRODUCT INFORMATION PROVIDED ON THIS WEBSITE ARE SOLELY FOR INFORMATION DISSEMINATION AND EDUCATIONAL PURPOSES.

The products provided on this website are intended exclusively for in vitro research. In vitro research (Latin: *in glass*, meaning in glassware) is conducted outside the human body. These products are not pharmaceuticals, have not been approved by the U.S. Food and Drug Administration (FDA), and must not be used to prevent, treat, or cure any medical condition, disease, or ailment. It is strictly prohibited by law to introduce these products into the human or animal body in any form.

Polypeptide Purity Control and Verification Technical System

Cocerpeptides.com provides peptides with purity exceeding 99%. Cocer Peptides achieves precise control and scientific verification of polypeptide purity by integrating advanced technologies and a full-process quality control system: In the synthesis stage, automated solid-phase peptide synthesis (SPPS) is employed to accurately assemble amino acid sequences. A gradient purification strategy ranging from medium-pressure liquid chromatography (MPLC) to preparative high-performance liquid chromatography (Prep-HPLC) is utilized, optimizing mobile phase composition and elution conditions based on the physicochemical properties of the target peptide (hydrophobicity, charge distribution, etc.) to efficiently remove impurities. For purity detection, reverse-phase high-performance liquid chromatography (RP-HPLC) serves as the core technique, separating components through the distribution difference of molecules between the stationary phase (hydrophobic packing) and the mobile phase (polar solvent). Purity is determined via retention time matching and peak area normalization. Meanwhile, electrospray ionization mass spectrometry (ESI-MS) is combined to precisely verify the molecular weight and composition through mass-to-charge ratio (m/z) analysis, eliminating structurally heterogeneous impurities. Quality management covers the entire chain from raw material acceptance, synthesis process monitoring to finished product release. A continuous quality fingerprint is constructed using multi-dimensional indicators (HPLC purity, MS molecular weight, solvent residue, etc.), and batch data traceability is achieved through a laboratory information management system (LIMS), ensuring each batch meets the prespecified purity standards. This system provides a reliable technical guarantee for preparing high-purity polypeptides through the organic integration of process optimization, multi-dimensional detection, and full-process quality control.

Concepts of High-Performance Liquid Chromatography (HPLC) and Mass Spectrometry (MS)

High-performance liquid chromatography (HPLC) is a separation technology widely used by Cocer Peptides for peptide purification. Driven by a high-pressure pump, the mobile phase carries samples through a chromatographic column packed with a specific stationary phase, achieving separation based on differences in the distribution coefficients of components between the two phases. It features high separation efficiency, fast analysis speed, and strong detection sensitivity, enabling precise capture of subtle differences between target peptides and impurities such as sequence analogs or deletion peptides.

Mass spectrometry (MS) is an analytical method that converts peptide molecules into gas-phase ions through ionization technology and separates/detects ions based on their mass-to-charge ratio (m/z). It can accurately determine the molecular weight of peptides and infer amino acid sequences through fragment ion information, serving as a key technology for verifying peptide structural correctness. The combination of these two techniques allows Cocer Peptides to establish a complete quality control system from both purity separation and structural confirmation perspectives. Both methods are high-precision peptide detection technologies that scientifically demonstrate the purity and composition of peptides ordered from cocerpeptides.com.

Cocer Peptides is committed to translating cutting-edge analytical technologies into tangible quality assurance. Our peptide synthesis laboratories are equipped with high-resolution mass spectrometers and ultra-high-performance liquid chromatography systems. Through real-time detection and data comparison of samples at each production stage, we continuously optimize synthesis processes to ensure every peptide product is delivered to customers with exceptional purity.

Recommended Peptide Purity Levels

Cocer Peptides provides only the highest-purity peptides (purity ≥99%) for research and development. The minimum recommended peptide purity level for specific applications depends on the application:

• In biochemical research, peptides used for enzyme activity analysis typically require ≥85% purity.

• In drug development, peptides for preclinical trials must meet >98% high-purity standards to ensure biological activity and safety.

• For diagnostic applications (e.g., antigen peptides in immunoassays), recommended purity is 90%-95% to guarantee detection specificity and sensitivity.

Cocer Peptides is confident in the quality of all our products, implementing strict quality monitoring at every stage of peptide synthesis—from crude peptide purification to final product release. Through multi-step purification and verification processes, we ensure each batch meets or exceeds the purity requirements for specific applications. Examples of acceptable minimum purity levels are as follows:

High Purity (>95%)

• Polypeptide drug research and production

• Preparation of targeted therapeutic drugs

• Raw materials for biological diagnostic reagents (e.g., ELISA, immunoassay kits)

• Development of polypeptide vaccines (therapeutic/preventive)

• Preparation of targeting peptides for antibody-drug conjugates (ADCs)

• Polypeptide reagents for life science research (e.g., receptor agonists/antagonists)

• Research on targeting peptide modification for gene therapy vectors

• Development of polypeptide antibiotics/antimicrobial peptides

• Preparation of polypeptide hormone analogs (e.g., insulin analogs)

• Reference standards for biomarker detection

• Research on cell culture additives

• Synthetic peptides for protein structure analysis and functional studies

Moderate Purity (>85%)

• Early-stage activity screening in polypeptide drug research

• Peptide additives for industrial enzymes

• Signal peptide raw materials

• Surface modification of biomaterials (e.g., medical catheters, tissue engineering scaffolds)

• Preparation of agricultural antimicrobial peptides

• Cell adhesion research

• Raw materials for polypeptide surfactants/detergents

• Polypeptide reagents for preliminary mechanistic research in scientific studies

Lower Purity (>70%)

• Preliminary structure-activity relationship (SAR) studies

• Initial verification of protein binding

• Primary cytotoxicity screening

• High-throughput screening of polypeptide drug lead compounds

High-purity polypeptides are suitable for scenarios requiring strict purity. The ultra-high-purity peptides provided by Cocer Peptides can meet and exceed all prespecified purity standards.