A verified Selank COA (Certificate of Analysis) is essential for confirming the chemical integrity, sequence identity, and purity of synthetic neuropeptides prior to preclinical experimentation. PX1 Research provides lot-specific, third-party analytical documentation for every batch of Selank, ensuring full transparency and rigorous quality control for institutional laboratories.
A verified Selank COA (Certificate of Analysis) is essential for confirming the chemical integrity, sequence identity, and purity of synthetic neuropeptides prior to preclinical experimentation. PX1 Research provides lot-specific, third-party analytical documentation for every batch of Selank, ensuring full transparency and rigorous quality control for institutional laboratories.
A Selank COA (Certificate of Analysis) is an official analytical document verifying the chemical identity, purity, molecular mass, and safety parameters of a specific batch of synthetic Selank. Every lot of PX1 Research Selank undergoes independent ISO 17025 third-party testing, providing quantitative reverse-phase high-performance liquid chromatography (RP-HPLC) purity analysis (>99%), electrospray ionization mass spectrometry (ESI-MS) molecular weight confirmation, and kinetic chromogenic endotoxin assay results.
For researchers conducting rigorous quantitative assays, access to batch-specific COAs guarantees that sequence variations, trace residual solvents, or truncated synthesis byproducts do not confound experimental outcomes. In preclinical settings, chemical consistency across lots is paramount for reproducible data collection.
Selank is a synthetic heptapeptide derived from the naturally occurring immunomodulatory peptide tuftsin, modified by the addition of a Pro-Gly-Pro tripeptide motif at the C-terminus to enhance metabolic stability against enzymatic degradation. Its primary chemical structure consists of the amino acid sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro (TKPRPGP), yielding a precise molecular formula of C33H57N11O9 and a theoretical molecular weight of 751.9 g/mol.
As a regulatory peptide, Selank exhibits distinct physicochemical properties that require precise synthesis protocols. When reviewing a Selank COA, researchers should confirm that the measured monoisotopic mass matches the theoretical calculations within acceptable mass spectrometry tolerances (typically ±0.5 Da). Discrepancies in mass data often indicate incomplete deprotection during solid-phase peptide synthesis (SPPS) or peptide degradation.
Analytical evaluation of synthetic peptides relies primarily on two complementary technique pairs: Reverse-Phase High-Performance Liquid Chromatography (RP-HPLC) for purity quantification and Electrospray Ionization Mass Spectrometry (ESI-MS) for structural identity verification. In a standard PX1 Research COA, RP-HPLC is performed using a C18 stationary phase column with a gradient elution profile of acetonitrile and water containing 0.1% trifluoroacetic acid (TFA).
The resulting chromatogram displays peak area integration, where the target peak for Selank must represent at least 99% of the total integrated area at 214 nm UV detection. Minor secondary peaks correspond to closely related impurities, such as deletion sequences or diastereomers. Concurrently, ESI-MS generates a clear mass-to-charge (m/z) spectrum, demonstrating a dominant single-protonated species [M+H]+ at 752.9 m/z, confirming structural integrity without secondary fragmentation artifacts.
Bacterial endotoxins—primarily lipopolysaccharides (LPS) derived from Gram-negative outer cell membranes—pose a major confounding variable in cellular and animal model research. Endotoxins can induce non-specific inflammatory signaling pathways, alter immune receptor expression, and mask specific neuropeptide mechanisms during preclinical research.
PX1 Research mandates strict endotoxin testing on every lot using the Limulus Amebocyte Lysate (LAL) kinetic chromogenic assay. Standard research-grade requirements limit bacterial endotoxin contamination to <0.01 EU/mg. This rigorous standard ensures that observed biological responses in downstream assays are attributable solely to the synthetic compound and not to pyrogenic contaminants.
A comprehensive Selank COA contains several critical data fields that laboratory managers must evaluate before initiating experimental protocols:
1. Lot/Batch Number: Provides complete traceability back to the raw materials, synthesis run, and purification process. 2. Physical Appearance: Lyophilized cake or powder, typically white to off-white, indicating complete solvent removal post-lyophilization. 3. Purity Percentage: HPLC area-under-the-curve (AUC) determination, consistently exceeding 99.0% for PX1 Research compounds. 4. Mass Spectral Analysis: ESI-MS peak identification verifying correct sequence mass. 5. Solubility Characteristics: Confirmation of aqueous solubility in standard buffer systems. 6. Residual Solvent Content: Gas chromatography (GC-MS) verification ensuring organic solvents (e.g., DMF, acetonitrile, TFA) are within safe limits for analytical models.
In preclinical neuropeptide studies, Selank is investigated for its complex modulatory effects across central neurotransmitter systems and immune pathways. In vitro binding studies and rodent brain tissue models indicate that Selank modulates the affinity of GABA-A receptors for GABA without direct agonist activity, acting as an allosteric regulator.
Additionally, preclinical literature demonstrates that Selank influences serotonergic transmission by altering 5-HT metabolism and gene expression patterns in limbic structures. Furthermore, as a tuftsin analogue, in vitro assays suggest Selank influences cytokine gene expression (including IL-6) and alters peripheral immunocompetent cell activity. To review comprehensive experimental literature regarding these pathways, consult our dedicated Selank research overview.
When designing neuropeptide signaling experiments, researchers frequently compare Selank to other regulatory linear peptides such as Semax and DSIP. While Selank is derived from tuftsin and modulates GABAergic and immune-related signaling, Semax is an ACTH(4-10) analogue primary investigated for neurotrophic factor expression (BDNF) and cholinergic modulation.
Conversely, Delta Sleep-Inducing Peptide (DSIP) targets central sleep architecture and endocrine stress-axis regulation via distinct central mechanisms. In systemic tissue recovery models, researchers also pair neuropeptide research with systemic compounds such as BPC-157. To verify batch standards across related compounds, researchers can examine the corresponding Semax COA lookup documentation.
Lyophilized Selank is stable at controlled room temperature for short periods during transit, but long-term storage requires temperature control at -20°C or -80°C in a desiccated environment to prevent atmospheric moisture uptake. Upon arrival, vials should be logged into the laboratory inventory using the unique lot number listed on the batch COA.
Reconstitution should be performed under a laminar flow hood using sterile, laboratory-grade solvents such as bacteriostatic water or phosphate-buffered saline (PBS, pH 7.4). Gentle agitation should be applied without vigorous vortexing to prevent peptide shearing. Once reconstituted, liquid aliquots should be stored at -20°C or -80°C to avoid repeated freeze-thaw cycles. Precise volumetric concentration calculations can be managed using our peptide reconstitution calculator.
PX1 Research maintains an uncompromising commitment to analytical rigor, supplying US-manufactured research peptides synthesized under strict GMP-compliant facility standards. Every peptide lot undergoes independent ISO 17025 lab verification prior to release, guaranteeing that published COA parameters reflect exact batch performance.
To support high-throughput institutional research and supply chain stability, PX1 Research operates dual fulfillment centers in California and Arizona, offering same-day shipping for orders placed Monday through Friday. High-volume laboratories and institutional procurement offices can explore custom lot reservations and bulk pricing through our wholesale lab account portal.
What is a selank coa?
A selank coa (Certificate of Analysis) is an official quality control document provided by PX1 Research that details the analytical test results for a specific batch of synthetic Selank. It includes quantitative data on chemical purity via RP-HPLC, molecular weight verification via mass spectrometry, physical characterization, and endotoxin levels.
How do I verify the authenticity of a Selank Certificate of Analysis?
Authentic PX1 Research Selank COAs feature a lot-specific matching number corresponding to the physical vial label, detailed chromatographic and mass spectral plots from an independent ISO 17025 accredited laboratory, clear testing methodology descriptions, and official sign-off from quality control officers.
What purity threshold is guaranteed on a PX1 Research Selank COA?
PX1 Research guarantees a minimum analytical purity threshold of 99.0% for Selank research compounds, as determined by integrated RP-HPLC peak area testing.
How is Selank identity verified in the COA?
Identity is confirmed using Electrospray Ionization Mass Spectrometry (ESI-MS). The COA displays the mass spectrum showing the theoretical molecular mass of Selank (751.9 g/mol) matched against the observed protonated ion peak [M+H]+.
Why is endotoxin testing critical on a Selank COA?
Endotoxin testing ensures that the compound is free from pyrogenic lipopolysaccharides (<0.01 EU/mg) that could induce non-specific inflammatory signaling or cytotoxic responses in sensitive in vitro and animal models.
What is the sequence and chemical formula on the Selank COA?
The COA lists the amino acid sequence as Thr-Lys-Pro-Arg-Pro-Gly-Pro (TKPRPGP) with a chemical formula of C33H57N11O9.
How should lyophilized Selank be stored upon arrival?
Lyophilized Selank should be stored at -20°C or -80°C in a desiccated container to preserve chemical stability over long periods.
What diluent is recommended for Selank reconstitution in laboratory assays?
Reconstitution should be conducted using sterile laboratory-grade bacteriostatic water, 0.9% sodium chloride, or phosphate-buffered saline (PBS, pH 7.4) depending on the requirements of the specific experimental model.
Where are PX1 Research Selank batches synthesized and tested?
All PX1 Research compounds are manufactured in USA-based, GMP-compliant facilities and tested by independent ISO 17025 accredited analytical laboratories.
How can institutional laboratories access bulk quantities and custom COA requests?
Institutional researchers can request custom analytical parameters or arrange high-volume orders through the PX1 Research wholesale portal.
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.