Epithalon Purity Standards & COA Requirements
Epithalon (Ala-Glu-Asp-Gly) is a short synthetic tetrapeptide modeled after the pineal gland bioregulator epithalamin. Investigated extensively in preclinical models for its role in telomerase gene expression, telomere length maintenance, and circadian rhythm regulation, high-purity Epithalon is essential for reproducible research. This technical guide outlines the HPLC, Mass Spectrometry (MS), and endotoxin analytical standards required to verify Epithalon quality before initiating laboratory studies.
Quick answer
Epithalon (Ala-Glu-Asp-Gly) is a short synthetic tetrapeptide modeled after the pineal gland bioregulator epithalamin. Investigated extensively in preclinical models for its role in telomerase gene expression, telomere length maintenance, and circadian rhythm regulation, high-purity Epithalon is essential for reproducible research. This technical guide outlines the HPLC, Mass Spectrometry (MS), and endotoxin analytical standards required to verify Epithalon quality before initiating laboratory studies.
Key takeaways
- [Epithalon](/research-peptides/epithalon) (also known as Epitalon or L-alanyl-L-alpha-glutamyl-L-alpha-aspartyl-glycine) is a synthetic tetrapeptide derived from the natural pineal peptide complex epithalamin.
- [Epithalon](/research-peptides/epithalon) possesses the primary amino acid sequence H-Ala-Glu-Asp-Gly-OH, giving it a molecular formula of C14H22N4O9 and an exact monoisotopic mass of 390.14 Da (molecular weight approximately 390.35 g/mol).
- The primary focus of [Epithalon](/research-peptides/epithalon) investigation centers on its interaction with the catalytic subunit of telomerase (TERT).
- High-Performance Liquid Chromatography (HPLC) serves as the primary analytical tool for determining the chemical purity of synthetic [Epithalon](/research-peptides/epithalon).
Introduction to Epithalon as a Synthetic Peptide Bioregulator
Epithalon (also known as Epitalon or L-alanyl-L-alpha-glutamyl-L-alpha-aspartyl-glycine) is a synthetic tetrapeptide derived from the natural pineal peptide complex epithalamin. Classified as a peptide bioregulator, Epithalon interacts directly with chromatin to modulate transcription patterns in targeted tissues. In laboratory settings, researchers utilize synthesized Epithalon to evaluate cellular aging pathways, enzymatic telomerase activation, and neuroendocrine function.
Because bioregulatory peptides operate at micromolar or nanomolar concentrations in cell culture and animal models, subtle batch variations, chemical impurities, or residual reagents can alter cellular binding kinetics and skew experimental data. Establishing strict protocol benchmarks for epithalon purity coa analysis ensures that structural activity relationships observed during testing stem solely from the pure peptide sequence rather than synthetic artifacts or contaminants.
Biochemical Structure and Properties of Epithalon (Ala-Glu-Asp-Gly)
Epithalon possesses the primary amino acid sequence H-Ala-Glu-Asp-Gly-OH, giving it a molecular formula of C14H22N4O9 and an exact monoisotopic mass of 390.14 Da (molecular weight approximately 390.35 g/mol). Containing acidic residues—glutamic acid and aspartic acid—the molecule exhibits a negative net charge at physiological pH and highly hydrophilic properties.
These structural characteristics influence both its solid-phase peptide synthesis (SPPS) parameters and its analytical behavior during high-performance liquid chromatography (HPLC). Synthetic synthesis requires meticulous deprotection steps to avoid truncated fragments (such as Glu-Asp-Gly or Ala-Glu-Asp) or racemized derivatives. Identifying these specific side-products on a Certificate of Analysis (COA) requires specific chromatographic conditions tailored for short, acidic hydrophilic peptides.
Preclinical Research Focus: Telomerase Activation and Chromatin Remodeling
The primary focus of Epithalon investigation centers on its interaction with the catalytic subunit of telomerase (TERT). In vitro studies in human somatic cell strains indicate that Epithalon application induces telomerase activity, resulting in telomere elongation and an increased Hayflick limit in culture models. Researchers theorize that Epithalon binds directly to histone proteins or promoter regions of the TERT gene, facilitating chromatin decompaction and enhancing transcription factor access.
Beyond primary telomerase induction, rodent models demonstrate that Epithalon administration influences antioxidant enzyme expression (including superoxide dismutase and glutathione peroxidase) and regulates pineal gland histology. Detailed mechanisms can be explored across our broader bioregulator peptides overview. To achieve reproducible baseline data when tracking subtle epigenetic and enzymatic changes, investigators must rely on laboratory reagents verified by comprehensive chemical analysis.
Analytical Chromatography: High-Performance Liquid Chromatography (HPLC) Requirements
High-Performance Liquid Chromatography (HPLC) serves as the primary analytical tool for determining the chemical purity of synthetic Epithalon. Reversed-phase HPLC (RP-HPLC) utilizing a C18 stationary phase and an acetonitrile/water mobile phase gradient enriched with 0.1% trifluoroacetic acid (TFA) is the standard methodology for separating the target tetrapeptide from synthetic impurities.
For laboratory research use, an acceptable Epithalon batch must demonstrate a minimum chromatographic purity of ≥98.0%, with top-tier research standards requiring ≥99.0%. On the UV chromatogram (typically monitored at 210 nm or 214 nm to detect peptide bonds), Epithalon produces a sharp, symmetrical single peak. Any secondary peaks representing truncated sequences, failure sequences, or unreacted protecting groups must not exceed 0.5% individual area or 1.0% total area.
Mass Spectrometry (MS) Verification: Confirming Sequence and Molecular Identity
While HPLC quantifies purity by assessing peak area ratios, Mass Spectrometry (MS)—specifically Electrospray Ionization Mass Spectrometry (ESI-MS) or Matrix-Assisted Laser Desorption/Ionization (MALDI-TOF)—confirms the precise molecular weight and sequence identity of the compound. Because short peptides can occasionally co-elute with structurally similar synthetic impurities, HPLC alone is insufficient to guarantee batch identity.
In positive ion ESI-MS mode, pure Epithalon typically yields a protonated molecular ion peak [M+H]+ at m/z 391.15 ± 0.5 Da, along with potential sodium adducts [M+Na]+ at m/z 413.13 Da. In negative ion mode, the deprotonated ion [M-H]- appears at m/z 389.13 Da due to the carboxylic acid side chains. A valid COA must include the mass spectrum showing the exact observed mass matching the theoretical molecular weight, confirming the absence of significant mass shifts caused by incomplete side-chain deprotection (e.g., residual t-butyl groups).
Endotoxin Testing: LAL Assay Thresholds for In Vitro and Animal Protocols
Bacterial endotoxins—lipopolysaccharides (LPS) originating from Gram-negative bacterial outer membranes—are critical contaminants that alter cell culture viability, induce non-specific inflammatory responses, and invalidate preclinical animal assays. Even synthetic peptides synthesized under strict conditions can acquire endotoxins during cleavage, purification, or lyophilization if ultrapure water and sterile processing equipment are not strictly maintained.
Endotoxin levels are quantified using the Limulus Amebocyte Lysate (LAL) assay or recombinant Factor C (rFC) fluorometric assay. For rigorous in vitro and animal research, Epithalon must meet a strict endotoxin specification of <0.01 EU/mg (or <0.1 EU/mg depending on experimental sensitivity). Low endotoxin standards prevent false-positive immunological activity during cell culture signaling experiments and protect animal models from endotoxin-induced systemic shock.
Essential Elements of a Legitimate Epithalon Certificate of Analysis (COA)
A valid Certificate of Analysis (COA) provides a complete analytical snapshot of a specific peptide production lot. When reviewing a COA for research-grade Epithalon, laboratory personnel must ensure the document includes the following core elements issued by an ISO 17025 accredited third-party testing facility:
1. Product Identification: Chemical name (Ala-Glu-Asp-Gly), CAS number (307297-39-8), lot/batch number, and appearance (typically a sterile, white lyophilized powder). 2. Purity Determination: HPLC chromatogram displaying integration tables, retention times, and total purity percentage (≥98.0%). 3. Identity Verification: ESI-MS spectrum confirming theoretical vs. observed mass. 4. Residual Analysis: Quantitative assay for endotoxin content (EU/mg) and residual solvent analysis (e.g., TFA, acetonitrile, water content). 5. Lab Metadata: Date of testing, signatures of qualified analytical chemists, and verifiable testing facility contact details.
Comparative Analysis: Epithalon vs. Related Bioregulator and Longevity Compounds
When designing preclinical research protocols focused on anti-aging mechanisms or circadian biology, researchers frequently compare Epithalon with other regulatory peptides. Understanding how Epithalon fits within the broader landscape of peptide bioregulators helps clarify structural and functional distinctions across target models.
While Epithalon targets nuclear telomerase transcription and pineal function, Thymalin is a peptide bioregulator extracted or modeled from the thymus gland that primarily modulates T-cell differentiation and immune responsiveness in animal models. Similarly, Pinealon (Glu-Arg-Glu) is a tripeptide bioregulator studied for its neuroprotective and central nervous system transcription-regulating effects. In contrast, non-bioregulator mitochondrial peptides such as MOTS-c operate through metabolic pathways, translocating to the nucleus during metabolic stress to regulate nuclear gene expression. Utilizing clean, fully characterized batches of each compound is essential when comparing multi-peptide synergistic interactions or lineage-specific cellular mechanisms in comparative studies.
Reconstitution, Handling, and Storage Protocols for Epithalon in the Lab
Epithalon is supplied as a lyophilized (freeze-dried) powder to maximize chemical stability during shipping and storage. Unopened vials should be stored at -20°C or -80°C in a desiccated environment, shielded from light, where the dry peptide remains stable for up to 24 months. To maintain chain integrity, avoid repeated freeze-thaw cycles of the dry matrix.
For reconstitution in laboratory protocols, dissolve the lyophilized powder using sterile Bacteriostatic Water (0.9% benzyl alcohol) or sterile normal saline (0.9% NaCl) depending on whether the solution is intended for multi-use in vitro testing or single-use animal models. Gently swirl the vial until the powder completely dissolves; avoid vigorous vortexing, which can introduce shear forces that disrupt short peptide chains. Once reconstituted, store liquid aliquots at 2°C to 8°C for short-term use (up to 14 days) or freeze at -20°C for extended experimental periods. Browse our complete technical documentation in the PX1 Research Library.
PX1 Research Quality Assurance & USA Synthesis Standards
PX1 Research enforces strict quality control standards for all research compounds supplied to academic, clinical, and private laboratory facilities. Epithalon synthesized for PX1 originates from state-of-the-art, GMP-compliant facilities in the United States, adhering strictly to automated solid-phase peptide synthesis (SPPS) protocols.
Every batch undergoes rigorous lot-specific analytical evaluation at independent ISO 17025 accredited laboratories. We publish complete HPLC chromatograms, MS spectral analysis, and LAL endotoxin data for every single lot, ensuring complete transparency and batch-to-batch consistency. Combined with same-day dispatch (Monday through Friday) from our CA and AZ distribution hubs, PX1 Research provides high-purity compounds required for high-impact preclinical research. Academic labs and institutions seeking high-volume supplies can review program options at our wholesale account page.
Frequently Asked Questions
What is the recommended purity threshold for Epithalon in preclinical research?
For robust and reproducible research outcomes, Epithalon should maintain a minimum purity of ≥98.0% as measured by RP-HPLC, with high-level cell culture and structural studies requiring ≥99.0% purity.
Why is mass spectrometry required in addition to HPLC for Epithalon analysis?
HPLC confirms peptide purity based on peak retention times and integration, but cannot definitively prove identity. Mass spectrometry (ESI-MS) measures the precise molecular weight (390.35 g/mol), confirming correct amino acid sequence synthesis and complete removal of protecting groups.
What endotoxin limits should a researcher expect on an Epithalon COA?
For in vitro cell culture and preclinical animal models, endotoxin levels should ideally be strictly monitored under <0.01 EU/mg (or <0.1 EU/mg depending on assay sensitivity) to prevent non-specific immune cell activation or cellular toxicity.
How does Epithalon compare structurally to Pinealon?
Epithalon is a tetrapeptide with the sequence Ala-Glu-Asp-Gly (molecular weight ~390.35 Da), whereas Pinealon is a tripeptide with the sequence Glu-Arg-Glu. Both function as peptide bioregulators but target different tissue systems and gene networks in preclinical research.
What solvent is recommended for reconstituting Epithalon in a laboratory?
Epithalon is highly water-soluble due to its hydrophilic acidic residues. It reconstitutes easily in sterile Bacteriostatic Water or sterile 0.9% Sodium Chloride (saline). Avoid aggressive shaking or vortexing.
How should reconstituted Epithalon solutions be stored?
Reconstituted liquid Epithalon should be stored in sterile, airtight aliquots at 2°C to 8°C for short-term use (up to 14 days) or frozen at -20°C for long-term storage to prevent peptide degradation or microbial growth.
Does PX1 Research provide lot-specific COAs with every Epithalon order?
Yes. Every lot of Epithalon supplied by PX1 Research includes a comprehensive, lot-specific COA verified by an independent ISO 17025 accredited laboratory, including full HPLC chromatograms, MS spectrum analysis, and endotoxin levels.
Is Epithalon approved for human consumption or therapeutic administration?
No. Epithalon provided by PX1 Research is strictly a research chemical sold for in vitro, laboratory, and preclinical animal research use only. It is not for human or animal medical, therapeutic, or clinical use.
All products are sold strictly for laboratory and research use only. Not for human or veterinary use, diagnosis, treatment or consumption. Statements have not been evaluated by the FDA.