GLOW Blend Molecular Weight, Sequence & CAS Reference

Overview of the GLOW Blend Composite Matrix

In analytical biochemistry and cellular assays, multi-component peptide mixtures present unique requirements for physical characterization and quantitative standardization. The GLOW blend is a precise stoichiometric composite comprising three individual synthetic peptides: Glycyl-L-histidyl-L-lysine copper complex (GHK-Cu), Body Protection Compound-157 (BPC-157), and Thymosin Beta-4 synthetic fragment (TB-500). Each component is synthesized independently, purified to high homogeneity, and subsequently lyophilized in a standardized mass ratio within a single laboratory vial.

Because the GLOW blend represents a defined multi-peptide lyophilized mixture rather than a single chemical entity, it does not possess a singular molecular formula, unified molecular weight, or monolithic CAS registry number. Instead, analytical laboratories must evaluate the chemical specifications—including sequence length, monoisotopic mass, total average molecular mass, and counterion salt content—of each constituent compound. Researchers seeking to audit product specifications or review complete inventory options can examine the GLOW Blend (GHK-Cu 2mg / BPC-157 500mcg / TB-500 500mcg) product page or browse our complete catalog of research peptides.

Understanding the distinct physicochemical identity of each peptide in the composite matrix is critical for establishing baseline controls, calibrating liquid chromatography-mass spectrometry (LC-MS) apparatus, and calculating net peptide concentration during in vitro experimental protocols. PX1 Research provides fully documented analytical data for every production lot to ensure precise reproducibility in preclinical research environments.

Molecular Weights and Empirical Formulas of Constituent Peptides

To properly configure mass spectrometers and perform quantitative gravimetric calculations, investigators must reference the individual molecular weights and molecular formulas of the three peptides present within the GLOW mixture. The primary constituent, GHK-Cu, consists of the tripeptide Gly-His-Lys coordinated with a divalent copper ion ($Cu^{2+}$). The chemical formula for the neutral, unprotonated complex is $C_{14}H_{22}CuN_6O_4$, yielding a base average molecular weight of approximately 403.93 g/mol. When accounting for standard counterion pairing and hydration states in lyophilized raw materials, the effective molecular mass shifts based on the specific salt form utilized.

The second component, BPC-157 (Pentadecapeptide BPC-157), is a 15-amino-acid synthetic peptide derived from human gastric juice protein sequences. Its chemical formula is $C_{62}H_{98}N_{16}O_{22}$, corresponding to a theoretical monoisotopic mass of 1418.70 Da and an average molecular weight of approximately 1419.53 g/mol. BPC-157 exhibits high stability in aqueous solution under controlled pH conditions, making its molecular weight determination highly consistent across high-performance liquid chromatography (HPLC) runs.

The third constituent, TB-500, corresponds to the active region or full-length sequence of Thymosin Beta-4 ($Teta4$). The complete 43-amino-acid polypeptide possesses an empirical formula of $C_{212}H_{350}N_{56}O_{78}S$, with a total average molecular weight of approximately 4963.50 g/mol (monoisotopic mass ~4960.52 Da). If an assay utilizes the truncated active hexapeptide domain (Ac-LKKTETQ), the molecular weight drops accordingly to ~889.01 g/mol ($C_{38}H_{68}N_{10}O_{14}$). PX1 Research explicitly declares the exact amino acid length and molecular mass of the TB-500 sequence on every lot-specific documentation package.

Primary Amino Acid Sequences and Structural Features

The structural utility of peptides in biochemical assays depends heavily on their exact amino acid primary sequence and terminal modifications. The GLOW blend integrates three distinct structural motifs spanning short chelated peptides, mid-length pentadecapeptides, and larger regulatory polypeptides:

1. GHK-Cu Sequence: H-Gly-His-Lys-OH : $Cu^{2+}$ - N-terminus: Free amine ($H-$) - C-terminus: Free carboxylic acid ($-OH$) - Structural Modification: Equimolar coordination complex with divalent copper ($Cu^{2+}$), forming a characteristic deep blue aqueous solution.

2. BPC-157 Sequence: H-Gly-Glu-Pro-Pro-Pro-Gly-Lys-Pro-Ala-Asp-Asp-Ala-Gly-Leu-Val-OH - Short Notation: H-GEPPPGLPADADGLV-OH - N-terminus: Free amine ($H-$) - C-terminus: Free carboxylic acid ($-OH$) - Structural Modification: Linear 15-mer without disulfides or synthetic capping groups.

3. TB-500 (Thymosin Beta-4) Sequence: Ac-Ser-Asp-Lys-Pro-Asp-Met-Ala-Glu-Ile-Glu-Lys-Phe-Asp-Lys-Ser-Lys-Leu-Lys-Lys-Thr-Glu-Thr-Gln-Glu-Lys-Asn-Pro-Leu-Pro-Ser-Lys-Glu-Thr-Ile-Glu-Gln-Glu-Lys-Gln-Ala-Gly-Glu-Ser-OH - N-terminus: N-acetylated ($Ac-$) - C-terminus: Free carboxylic acid ($-OH$) - Structural Modification: Acetylation at the N-terminal serine residue provides resistance against aminopeptidase degradation during cell culture assays.

CAS Registry Numbers and Chemical Identifiers

Chemical Abstract Service (CAS) numbers provide unambiguous identification for individual chemical substances. Because the GLOW blend is a physical composite of three distinct molecules, there is no single CAS registry number that covers the intact blend. Laboratory safety data sheets (MSDS/SDS) and chemical registries list the blend under its individual active components.

The CAS registry number for GHK-Cu (copper tripeptide-1) is 49557-75-7 (with 89030-95-5 frequently assigned to the unchelated GHK tripeptide parent molecule). BPC-157 is formally registered under CAS number 137525-51-0. Full-length Thymosin Beta-4 / TB-500 is indexed under CAS number 77591-33-4 (with 885340-86-7 assigned to specific acetate salt forms or truncated active domains).

When logging research compounds into laboratory information management systems (LIMS) or preparing chemical regulatory compliance documentation, researchers should enter each constituent CAS number alongside its respective mass fraction (2.0 mg GHK-Cu, 0.5 mg BPC-157, 0.5 mg TB-500). Stated values reflect raw sequence standards; exact salt modifications must be accounted for during analytical quantification.

Counterion Chemistry: TFA vs. Acetate Salt Forms & Net Peptide Content

Synthetic peptides manufactured via Solid-Phase Peptide Synthesis (SPPS) are cleaved from resin supports using trifluoroacetic acid (TFA). Consequently, crude peptides naturally form TFA salts, where positively charged basic residues (such as Lysine, Histidine, and Arginine) pair with trifluoroacetate counterions ($CF_3COO^-$). While TFA salts are suitable for many baseline biochemical procedures, excess TFA counterions can exhibit cytotoxicity in specific sensitive cell culture lines or alter UV absorbance during spectroscopic analysis.

To mitigate cellular toxicity in delicate preclinical models, high-grade research peptides undergo ion-exchange chromatography to convert TFA salts into acetate ($CH_3COO^-$) salts. Understanding the difference between TFA and acetate counterions is essential when calculating Net Peptide Content (NPC). Net Peptide Content represents the actual mass percentage of pure peptide backbone relative to the total mass of the lyophilized powder, which includes bound counterions and residual balance water.

For example, a vial containing a nominal mass of 3.0 mg total peptide powder with an 80% Net Peptide Content contains 2.4 mg of active peptide sequence and 0.6 mg of counterions and bound moisture. When preparing quantitative molar solutions for in vitro assays, researchers must account for NPC factors to avoid under-dosing experimental media. Every lot produced by PX1 Research undergoes rigorous analysis to quantify exact net peptide fractions, with transparent reporting documented on each Certificate of Analysis (COA).

Analytical Characterization: HPLC Purity and LC-MS Verification

Analytical verification of multi-peptide formulations requires high-resolution separation techniques paired with accurate mass detection. Reverse-Phase High-Performance Liquid Chromatography (RP-HPLC) utilized for the GLOW blend employs hydrophobic stationary phases (C18 columns) with gradient elution (typically acetonitrile/water containing 0.1% TFA or formic acid). Because GHK-Cu, BPC-157, and TB-500 possess distinct hydrophobicities and net charges, RP-HPLC resolves the mixture into three clear, fully separated chromatographic peaks.

Purity determination is calculated by integrating the Area Under the Curve (AUC) at UV wavelengths of 214 nm and 280 nm, as well as 600 nm for the copper coordination band of GHK-Cu. PX1 Research mandates a minimum purity threshold of $\ge 98.0\%$ for each individual peak within the composite blend, ensuring that no significant truncated sequences, deletion sequences, or oxidation artifacts contaminate the research material.

Liquid Chromatography-Mass Spectrometry (LC-MS) electro-spray ionization (ESI) is simultaneously used to confirm the exact monoisotopic mass of each peak. ESI-MS spectrum analysis confirms the charge states ($[M+H]^+$, $[M+2H]^{2+}$, $[M+3H]^{3+}$) matching the theoretical molecular weights of GHK-Cu ($m/z \approx 404.13$), BPC-157 ($m/z \approx 1419.70$), and TB-500 ($m/z \approx 4964.50$). Detailed chromatographic and mass spectra are available for download via our public COA lookup portal.

Comparative Analysis: GLOW Blend vs. Single-Peptide Research Assays

When designing comparative preclinical assays, investigators frequently evaluate whether to deploy composite blends or single-entity controls. The GLOW blend provides a multi-pathway research tool by combining three distinct signaling peptides into a unified matrix. However, evaluating individual mechanistic targets requires understanding how the blend components contrast with individual standalone compounds.

For instance, single-component studies utilizing BPC-157 focus exclusively on focal adhesion kinase pathways and nitric oxide system modulation without interference from exogenous copper ions. Conversely, isolated GHK-Cu assays specifically evaluate gene expression changes in collagen synthesis and remodeling enzymes, while standalone TB-500 protocols target actin polymerization and cell migration dynamics. In comparative inflammation or dermatological tissue culture models, investigators may also compare these outcomes against alternative low-molecular-weight sequences such as KPV or pineal regulatory peptides like Epithalon to map distinct cellular signaling cascades.

By utilizing standardized multi-peptide blends alongside single-peptide controls, laboratories can efficiently observe potential additive or synergistic signaling events in cell culture models while maintaining precise stoichiometric control over every experimental variable.

Solvent Reconstitution and Chemical Stability Protocols

Lyophilized peptide blends require proper reconstitution protocols to preserve tertiary structure and prevent premature peptide hydrolysis or aggregation. The GLOW blend is supplied as a sterile lyophilized cake that must be reconstituted using Laboratory-grade Bacteriostatic Water (0.9% benzyl alcohol) or Sterile Normal Saline (0.9% NaCl) depending on the requirements of the downstream in vitro system.

Because GHK-Cu contains a chelated copper metal ion, basic or strongly alkaline reconstitution solvents must be avoided to prevent copper dissociation or precipitation. Recommended reconstitution procedure involves allowing the glass vial to reach room temperature before introducing the solvent slowly along the inner glass wall. Swirl the vial gently; never vortex or vigorously agitate multi-component peptide solutions, as shear stress can cause protein denaturation and aggregation.

To calculate precise volumetric concentrations for lab pipetting, investigators should utilize our dedicated online reconstitution calculator. Reconstituted solutions should be aliquoted into polypropylene microcentrifuge tubes to prevent adsorption to glass walls and stored at $-20^\circ\text{C}$ or $-80^\circ\text{C}$ for long-term stability. Avoid repeated freeze-thaw cycles, which degrade peptide integrity over time. Laboratories requiring bulk quantities or recurring supply contracts for large-scale screening projects can establish a wholesale research account for dedicated account support.

Endotoxin Testing and Quality Assurance Parameters

Bacterial endotoxins (lipopolysaccharides, LPS) present in laboratory reagents can cause artifactual activation of Toll-like receptor 4 (TLR4) in cell cultures, skewing immunological and gene expression data. To guarantee that the GLOW research blend does not introduce uncontrolled inflammatory variables, PX1 Research subjects every production batch to rigorous endotoxin testing.

Utilizing Limulus Amebocyte Lysate (LAL) kinetic chromogenic assays per USP <85> guidelines, our quality control procedures verify that endotoxin levels remain strictly below $< 0.05 \text{ EU/mg}$. Furthermore, all synthesis and lyophilization steps are conducted inside ISO Class 5 cleanrooms within GMP-compliant facilities operating in the USA.

Finished vials are tested in an ISO 17025 accredited laboratory to verify physical appearance, solubility, heavy metal content, residual solvent limits (per ICH Q3C guidelines), and sterility. This comprehensive quality control framework ensures that academic and industrial research teams receive analytical-grade materials suitable for high-throughput screening and rigorous scientific publications. Preclinical researchers can explore deeper technical publications in our main research library.