High purity Selank is a synthetic regulatory heptapeptide derived from the naturally occurring immunomodulating peptide tuftsin, developed specifically for advanced preclinical neuropeptide research. Laboratories require high purity Selank evaluated via RP-HPLC and ESI-MS to ensure accurate quantitative outcomes across GABAergic, serotonergic, and neurotrophic assay models. PX1 Research provides analytical-grade Selank manufactured in US-based GMP-compliant facilities with lot-specific certificates of analysis.
High purity Selank is a synthetic regulatory heptapeptide derived from the naturally occurring immunomodulating peptide tuftsin, developed specifically for advanced preclinical neuropeptide research. Laboratories require high purity Selank evaluated via RP-HPLC and ESI-MS to ensure accurate quantitative outcomes across GABAergic, serotonergic, and neurotrophic assay models. PX1 Research provides analytical-grade Selank manufactured in US-based GMP-compliant facilities with lot-specific certificates of analysis.
Selank (sequence: Thr-Lys-Pro-Arg-Pro-Gly-Pro) is a synthetic analog of the human tetrapeptide tuftsin, modified by the addition of a Pro-Gly-Pro tripeptide sequence at its C-terminus. This structural elongation was designed to increase metabolic stability against circulating peptidases while preserving bioactive domain recognition. Researchers evaluating high purity Selank focus on its conformational stability in aqueous buffer systems and its specific molecular weight of 751.9 g/mol.
The metabolic degradation profile of Selank differs significantly from unmodified tuftsin. Preclinical enzymatic assays indicate that the C-terminal Pro-Gly-Pro extension inhibits rapid aminopeptidase and carboxypeptidase cleavage, extending the half-life of intact peptide fragments in tissue culture medium and plasma supernatant models. This structural modification enables standardized exposure intervals in extended cell culture and tissue explant designs without requiring continuous micro-infusion.
When sourcing high purity Selank for quantitative research, verifying peptide sequence integrity and counter-ion content is vital. Standard solid-phase peptide synthesis (SPPS) yields trifluoroacetate (TFA) salts; specialized downstream purification protocols are necessary to minimize residual free TFA, which can introduce artifacts into sensitive electrophysiological and cellular respiration assays. Investigating broader structural variants across our research peptides catalog helps establish precise baseline parameters for synthetic neuropeptide stability.
Evaluating peptide purity requires rigorous analytical validation using complementary chromatographic and spectroscopic techniques. High purity Selank must demonstrate a chemical purity threshold of ≥98% as determined by Reverse-Phase High-Performance Liquid Chromatography (RP-HPLC) monitored at 214 nm and 280 nm UV wavelengths. HPLC chromatograms must exhibit a sharp, symmetrical primary peak free of major deletion-sequence co-elutions.
Mass validation via Electrospray Ionization Mass Spectrometry (ESI-MS) serves as the primary verification of molecular identity, confirming the exact mass-to-charge ratio (m/z) corresponding to the structural formula C33H57N11O9. Every production batch of high purity Selank 10mg supplied by PX1 Research undergoes rigorous testing in an ISO 17025 accredited analytical facility to ensure that identity and purity metrics meet strict research specifications.
Beyond structural purity, endotoxin quantification is critical for cellular and preclinical animal models. Bacterial lipopolysaccharide (LPS) contamination can skew cytokine expression profiles, obscure microglial activity assays, and induce non-specific inflammatory signaling. PX1 Research tests every batch using Chromogenic Recombinant Factor C (rFC) assays, maintaining strict limits below 0.01 EU/mg to preserve experimental integrity across all wholesale lab accounts.
Preclinical investigations demonstrate that Selank modulates neurochemical transmission primarily through indirect interactions with the gamma-aminobutyric acid (GABA) system and monoaminergic pathways. In vitro receptor binding studies indicate that Selank does not directly compete with classical benzodiazepine site ligands; instead, it exhibits allosteric modulation of GABAA receptor complexes, altering receptor affinity for endogenous agonists under specific metabolic conditions.
In rodent hippocampal slice models, exposure to Selank alters gene expression profiles related to GABA receptor subunit configuration, specifically altering alpha-1 and beta-2 subunit transcript levels. Concurrently, preclinical binding assays suggest modulation of serotonergic transmission. Rodent brain tissue analysis reveals shifts in 5-hydroxyindoleacetic acid (5-HIAA) concentrations and serotonin turnover rates in the frontal cortex following administration of regulatory neuropeptides.
These neurochemical alterations occur alongside alterations in brain-derived neurotrophic factor (BDNF) gene expression. In vitro neuronal cell cultures treated with Selank demonstrate upregulation of BDNF mRNA synthesis, suggesting potential pathways involved in synaptic plasticity and neuronal survival mechanisms under metabolic stress. Researchers examining these cascades frequently compare results with data from high purity Semax to map overlapping regulatory cascades.
Inherited from its parent molecule tuftsin, Selank retains significant immunomodulatory potential. In vitro cell cultures utilizing isolated peripheral blood mononuclear cells (PBMCs) and murine microglial lines demonstrate that Selank influences the transcription and secretion of both pro-inflammatory and anti-inflammatory cytokines. Specifically, studies document dose-dependent changes in Interleukin-6 (IL-6) expression and altered balance between Th1 and Th2 cytokine pathways.
Preclinical models investigating systemic immune responses show that Selank modulates the functional activity of phagocytic cells, including neutrophil chemotaxis and macrophages. Experimental data indicate that the peptide alters the gene expression of endogenous opioid peptides, such as enkephalins, within leukocyte populations, pointing toward direct cross-talk between the central nervous system and immune system signaling networks.
These dual neuro-immune interactions make Selank a useful compound for investigating neuroinflammatory cascades, neurodegenerative models, and stress-induced immune dysfunction in vitro. For comprehensive cross-compound studies, investigators often evaluate BPC-157 10mg alongside Selank to observe comparative tissue repair and cytokine modulation dynamics.
Evaluating synthetic regulatory peptides requires precise comparative frameworks within preclinical study designs. While Selank is derived from the endogenous tetrapeptide tuftsin (Thr-Lys-Pro-Arg), it exhibits distinct biological stability and functional target profiles compared to related synthetic analogs. Semax, for instance, is an ACTH(4-10) analog (Met-Glu-His-Phe-Pro-Gly-Pro) primarily investigated for melanocortin receptor interaction and neurotrophic factor elevation rather than direct GABAergic modulation.
The following comparative matrix outlines key physical and functional parameters evaluated across these neuropeptides in published preclinical literature:
- **Selank**: Structure: Thr-Lys-Pro-Arg-Pro-Gly-Pro | Primary Targets: GABAA allosteric modulation, BDNF expression, IL-6/cytokine signaling | Stability: Enhanced C-terminal stability via Pro-Gly-Pro extension | Common Assay Focus: Neuro-immune cross-talk, GABAergic transcriptomics. - **Semax**: Structure: Met-Glu-His-Phe-Pro-Gly-Pro | Primary Targets: Melanocortin MC4/MC5 receptors, BDNF/TrkB axis, cholinergic pathways | Stability: C-terminal extended hexapeptide stability | Common Assay Focus: Neuroprotection, ischemic stroke models, cognitive processing assays. Learn more via our Semax research guide. - **Tuftsin**: Structure: Thr-Lys-Pro-Arg | Primary Targets: Fc-receptor interaction, macrophage/microglial activation, phagocytosis enhancement | Stability: Rapid rapid enzymatic cleavage in serum | Common Assay Focus: Basic immunology, phagocytic receptor kinetics. See our structural analysis in the tuftsin research overview. - **DSIP**: Structure: Trp-Ala-Gly-Gly-Asp-Ala-Ser-Gly-Glu | Primary Targets: Endocrine axis modulation, central slow-wave synchronization models | Stability: Moderate stability in CNS explants | Common Assay Focus: Circadian rhythm transcriptomics, HPA axis modulation. Explore details on DSIP 5mg.
Maintaining structural integrity during handling is mandatory for accurate analytical results. Lyophilized high purity Selank should be stored at -20°C or -80°C in a dry environment protected from light. Lyophilized cakes stored under deep freeze conditions maintain chemical stability for extended periods, minimizing spontaneous hydrolysis or oxidation of sensitive residues.
Reconstitution protocols must follow strict aseptic technique within a certified laminar flow hood. For in vitro cell culture and biochemical assays, reconstitute the lyophilized powder using sterile, endotoxin-free water or high-grade bacteriostatic water (0.9% benzyl alcohol). The solvent should be added gently down the inner glass wall of the vial, followed by gentle swirling or inversion. Avoid vigorous vortexing or sonication, as mechanical shear stress can disrupt peptide tertiary structures and induce aggregation.
Once reconstituted, working aliquots should be prepared immediately to prevent degradation from repeated freeze-thaw cycles. Stock solutions diluted in sterile physiological saline or phosphate-buffered saline (PBS, pH 7.4) should be stored at 4°C for short-term experimentation (not exceeding 7–14 days) or flash-frozen in liquid nitrogen and held at -80°C for long-term study protocols. Detailed reconstitution guidelines and concentration calculators can be accessed via our laboratory support hub.
In vitro experimental designs utilizing Selank frequently measure gene expression changes via quantitative Reverse Transcription Polymerase Chain Reaction (qRT-PCR). Standard laboratory assays expose cultured neuronal or microglial populations to concentrations ranging from 10 nM to 10 µM over defined incubation windows (1 to 24 hours), tracking mRNA abundance for GABAA receptor subunits, BDNF, TrkB, and key inflammatory mediators.
Electrophysiological studies on isolated brain slice preparations utilize Selank to quantify patch-clamp currents across postsynaptic membranes. These assays permit direct observation of allosteric modulatory effects on chloride ion flux driven by GABA application, providing empirical data on receptor kinetics without confounding systemic factors.
Radioligand binding assays represent another primary experimental model. By applying tritiated ligands alongside high purity Selank, investigators can accurately measure displacement curves and calculate dissociation constants (Kd) and maximal binding capacities (Bmax) across various central nervous system tissue homogenates.
Sourcing high purity Selank for institutional research demands strict supply chain verification. PX1 Research synthesizes all peptides in US-based, state-of-the-art facilities compliant with GMP guidelines. Every synthesized lot undergoes rigorous verification using state-of-the-art analytical equipment to confirm chemical structure, sequence, and purity standards prior to packaging.
Quality assurance documentation is fully transparent: every order includes access to a lot-specific Certificate of Analysis (COA) containing raw RP-HPLC chromatograms, Mass Spectrometry traces, residual solvent analysis, and chromogenic endotoxin assay results. This complete traceability guarantees that research teams receive materials free from uncharacterized impurities or batch-to-batch variability.
To support rigorous laboratory schedules, PX1 Research provides same-day dispatch for orders confirmed Monday through Friday before 3:00 PM EST, shipping directly from specialized fulfillment centers in California and Arizona. Secure your institution's supply directly through our dedicated high purity Selank product page or establish a dedicated supply agreement via our wholesale portal.
What is high purity selank?
High purity selank is an analytical-grade synthetic regulatory heptapeptide (Thr-Lys-Pro-Arg-Pro-Gly-Pro) with a verified chemical purity of 98% or greater by RP-HPLC. It is produced for laboratory research evaluating GABAergic signaling, neurotrophic factor expression, and immunomodulatory pathways in vitro and in preclinical animal models.
What analytical methods are used to verify the purity of Selank?
Selank purity is verified using Reverse-Phase High-Performance Liquid Chromatography (RP-HPLC) to measure chemical purity and Electrospray Ionization Mass Spectrometry (ESI-MS) to confirm exact molecular mass (751.9 g/mol). Endotoxin levels are quantified using Chromogenic Recombinant Factor C (rFC) assays.
Where can laboratories purchase high purity Selank?
Laboratories can source high purity Selank directly from PX1 Research. PX1 manufactures peptides in US-based GMP-compliant facilities and provides lot-specific ISO 17025 accredited Certificates of Analysis with every shipment.
What is the recommended storage procedure for lyophilized Selank?
Lyophilized Selank should be stored desiccated at -20°C or -80°C upon receipt, protected from direct light. Under deep-freeze conditions, the dry peptide remains stable for extended periods without significant hydrolytic degradation.
How should Selank be reconstituted for in vitro laboratory assays?
Reconstitution should be conducted in a sterile environment using endotoxin-free water or bacteriostatic water. Gently introduce the solvent down the side of the glass vial and swirl slowly until dissolved. Avoid high-shear mechanical agitation such as vortexing.
What is the molecular difference between Selank and Tuftsin?
Tuftsin is an endogenous immunomodulatory tetrapeptide (Thr-Lys-Pro-Arg). Selank extends this core sequence with a C-terminal Pro-Gly-Pro tripeptide sequence, which significantly increases resistance to peptidase cleavage in bioassays.
What are the acceptable endotoxin limits for Selank in research?
PX1 Research maintains strict endotoxin thresholds below 0.01 EU/mg for Selank. This ensures that cellular and immunological assays remain free from lipopolysaccharide artifacts.
How long does reconstituted Selank remain stable at 4°C?
Reconstituted Selank solutions in sterile buffer or saline remain stable at 4°C for approximately 7 to 14 days. For long-term storage, solutions should be divided into single-use aliquots and frozen at -80°C.
Does PX1 Research ship Selank directly from the United States?
Yes. All PX1 Research products ship directly from distribution centers located in California and Arizona, offering same-day dispatch for orders placed Monday through Friday before 3:00 PM EST.
Can institutions establish bulk or wholesale supply contracts for Selank?
Yes, academic institutions and private research facilities can set up bulk ordering and custom synthesis accounts through the PX1 Research wholesale portal, offering standardized pricing and guaranteed lot reservation.
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.