Selank 2mg — Vial Spec, Reconstitution Math & COA

Product Overview and Catalog Availability

A 2mg vial of Selank consists of a vacuum-sealed glass vial containing precisely 2.0 milligrams of the synthetic heptapeptide in a highly purified, lyophilized cake format. This specification is primarily selected by academic, industrial, and clinical assay laboratories performing initial screening assays, high-performance liquid chromatography (HPLC) calibration protocols, or small-scale rodent behavioral assays where long-term storage of reconstituted solution is undesirable.

To ensure maximal stability, batch consistency, and shelf-life economy across broad institutional study designs, PX1 Research currently standardizes inventory on the higher-capacity Selank 10mg formulation rather than active stocking of 2mg units. However, understanding the exact reconstitution mathematics, volumetric concentrations, and analytical parameters for a 2mg mass remains essential for researchers utilizing existing 2mg stock or adapting protocol volumes across various vial sizes. Researchers looking to explore our full inventory of regulatory-grade research compounds can review our all peptides catalog.

Chemical Profile and Molecular Specifications

Selank is a synthetic derivative of the human immunomodulatory peptide Tuftsin, engineered via the addition of a Pro-Gly-Pro tripeptide sequence to its C-terminus to enhance metabolic stability and enzymatic resistance. Its chemical sequence is Thr-Lys-Pro-Arg-Pro-Gly-Pro (T-K-P-R-P-G-P), yielding a molecular formula of C33H57N11O9 and a molecular weight of approximately 751.9 g/mol.

In its lyophilized state, Selank presents as a white to off-white cake or powder. The inclusion of the C-terminal proline-glycine-proline motif protects the core tetrapeptide from rapid cleavage by circulating carboxypeptidases and endopeptidases during in vitro cell line incubation or animal tissue homogenate assays. Understanding these structural properties aids researchers in modeling enzymatic kinetics and binding affinities across target receptor populations.

Reconstitution Mathematics for 2mg Lyophilized Mass

Accurate dilution calculations are critical when preparing lyophilized peptides for volumetric micro-pipetting in laboratory experiments. Reconstituting a 2mg vial of Selank with varying diluent volumes yields specific milligram-per-milliliter (mg/mL) and microgram-per-microliter (mcg/μL) concentration ratios suitable for distinct bioassay requirements.

When adding 1.0 mL of bacteriostatic water or sterile 0.9% sodium chloride, the resulting concentration is exactly 2.0 mg/mL (or 2.0 mcg/μL). Adding 2.0 mL of diluent yields a concentration of 1.0 mg/mL (1.0 mcg/μL). Adding 3.0 mL of diluent lowers the final working concentration to 0.67 mg/mL (0.67 mcg/μL). Researchers needing to verify liquid transfers, syringe graduations, or custom molar concentrations should utilize our online reconstitution calculator to eliminate mathematical variance prior to liquid transfer.

Aliquot Planning and Solution Handling Protocols

Repeated freeze-thaw cycles subject peptide chains to mechanical shear stress and localized concentration changes, leading to denaturation, aggregation, or loss of biological activity. Following initial reconstitution of a 2mg Selank vial, researchers should immediately plan an aliquot schedule based on anticipated daily micro-dispensing volumes.

Using sterile, non-pyrogenic microcentrifuge tubes, divide the reconstituted solution into single-use volumetric fractions (e.g., 50 μL or 100 μL). Freeze these aliquots at -20°C or -80°C for extended experimental timelines. Once a single working aliquot is thawed for a daily bench assay, it should be maintained at 2°C to 8°C and consumed within 24 to 48 hours. Any remaining material from a thawed aliquot subject to prolonged room temperature exposure must be discarded according to institutional disposal protocols.

Storage Specifications and Lyophilized Stability

Lyophilized Selank maintains maximum stability when stored in an ultra-low temperature freezer environment (-20°C to -80°C) protected from direct light exposure. Under these conditions, the un-reconstituted peptide cake maintains sequence integrity and minimal degradation rates for up to 24 months from the date of synthesis.

Short-term storage of un-reconstituted vials at standard refrigeration (2°C to 8°C) is acceptable for up to 90 days, provided the vial seal remains intact and vacuum pressure is uncompromised. Upon reconstitution, aqueous solutions undergo gradual hydrolytic degradation; reconstituted vials kept at 4°C should ideally be utilized within 21 to 30 days. Desiccated, cold storage conditions prevent atmospheric moisture absorption during vial equilibration prior to bench working procedures.

Analytical Verification: Lot-Specific COA and Quality Control

Every production lot of Selank at PX1 Research undergoes rigorous, independent laboratory verification prior to distribution. Our analytical quality standard demands ≥98.0% peptide purity assessed via High-Performance Liquid Chromatography (HPLC) alongside exact identity confirmation through Electrospray Ionization Mass Spectrometry (ESI-MS).

Furthermore, every lot undergoes Chromogenic Reagent LAL Endotoxin Testing to confirm endotoxin levels fall strictly below 0.01 EU/mg, ensuring compatibility with sensitive in vitro cell assays and preclinical animal models. Investigators requiring documentation for compliance or audit files can instantly view or download verified analytical reports directly through our dedicated Certificate of Analysis database by searching their lot number.

Comparative Analysis: Selank, Semax, and Related Analogues

When designing comparative neurological or immunomodulatory protocols, researchers often evaluate Selank alongside parallel synthetic peptide sequences. For instance, Semax 10mg represents an ACTH(4-10) analogue focused heavily on neurotrophic factor expression, whereas Selank acts primarily through GABAergic pathways and enkephalinase inhibition. Similarly, modifications such as N-Acetyl Semax Amidate 10mg demonstrate altered metabolic half-lives in enzymatic degradation assays compared to native structures. Comparing these compounds against baseline endogenous peptides like Tuftsin allows investigators to map structural modifications to changes in receptor affinity and enzymatic stability.

Preclinical Research Focus and Mechanisms of Action

In vitro and animal model literature documents multiple target mechanisms for Selank. Preclinical studies suggest that Selank modulates allosteric binding sites on the GABA-A receptor complex, altering chloride channel kinetics without binding directly to the classical benzodiazepine recognition site. This unique interaction allows researchers to study central nervous system inhibitory tone without observing classical sedation phenotypes in rodent models.

Additional research indicates that Selank inhibits carboxypeptidase N and Leu-enkephalin-degrading enzymes, effectively prolonging the endogenously produced enkephalins in blood plasma and tissue preparations. In cell culture assays, exposure to Selank has been demonstrated to upregulate expression of Brain-Derived Neurotrophic Factor (BDNF) and mRNA transcripts associated with inflammatory cytokine regulation, providing a rich framework for neurobiological and immunological inquiry.

Determining Optimal Vial Size: 2mg vs. 10mg Formulations

Selecting the appropriate vial size depends on experimental scale, number of study subjects, and reagent turnover rate. A 2mg vial format minimizes reagent waste when running short-duration validation studies or single-plate ELISA assays where fresh solution is required daily. However, for multi-week preclinical rodent cohorts or high-throughput screenings, larger vial formats offer significant operational advantages.

Utilizing a 10mg vial—such as PX1 Research's standard Selank 10mg product—reduces lot-to-lot variance across extended longitudinal trials while optimizing shipping and storage logistics. Furthermore, higher-mass vials lower the cost-per-milligram baseline for research laboratories operating under structured grant budgets. Detailed comparative literature and mechanistic overviews can be accessed through our centralized peptide research hub.

Procurement, Quality Assurance, and Institutional Ordering

PX1 Research manufactures all compounds in state-of-the-art, GMP-compliant facilities within the United States, adhering strictly to ISO 17025 laboratory testing guidelines. All orders ship directly from our climate-controlled distribution centers in California and Arizona, featuring same-day dispatch for orders placed Monday through Friday prior to cutoff times.

Academic institutions, government research facilities, and private biotechnology laboratories requiring bulk supply, custom fill sizes, or formal institutional quotes can streamline procurement via our dedicated wholesale lab portal. All reagents are provided exclusively as pure, single-compound powders for in vitro and preclinical laboratory research use only.