Selank 30mg — Vial Spec, Reconstitution Math & COA

Overview of the Selank 30mg High-Capacity Specification

A 30mg Selank research vial contains thirty milligrams of high-purity, lyophilized synthetic heptapeptide (sequence: Thr-Lys-Pro-Arg-Pro-Gly-Pro). Developed structurally as an analog of the naturally occurring human immunomodulatory peptide tuftsin, Selank incorporates a C-terminal Pro-Gly-Pro tripeptide sequence that enhances enzymatic stability against circulatory peptidases. The 30mg specification is specifically designed for high-density academic, industrial, and pharmaceutical research laboratories that require large operational batches for multi-subject preclinical protocols or automated liquid-handling assays.

When purchasing high-mass configurations, investigators mitigate lot-to-lot variance across extended experimental timelines. While standard individual studies often utilize the standard Selank 10mg format, high-throughput screening platforms and longitudinal rodent cohorts frequently deploy 30mg unit sizes to minimize reconstitution events and secure uniform stock solution concentrations. Please note that while PX1 Research maintains high-volume manufacturing capabilities for bulk lab contracts via our wholesale program, standard catalog availability may vary; researchers should check current stock listings across all peptides or consult their account manager for custom filling schedules.

Chemical Structure, Molecular Weight, and Sequence Profile

Selank is a synthetic derivative possessing the chemical formula C33H57N11O9 and a molecular mass of 751.9 g/mol. The primary amino acid chain consists of L-threonyl-L-lysyl-L-prolyl-L-arginyl-L-prolyl-glycyl-L-proline. The structural addition of the Pro-Gly-Pro fragment to the native tuftsin sequence significantly extends its half-life in biological matrices by offering steric hindrance against aminopeptidase and carboxypeptidase cleavage.

In preclinical model systems, researchers evaluate Selank for its interactions with the central nervous system, neurotrophic pathways, and immune system signaling cascades. In vitro assays demonstrate binding affinity toward specific neurotransmitter receptors, modulatory effects on brain-derived neurotrophic factor (BDNF) expression, and alterations in enkephalin degradation pathways. As a research compound, all chemical properties are evaluated strictly within controlled laboratory environments, devoid of therapeutic or clinical applications.

Precise Reconstitution Mathematics for a 30mg Mass

Accurate reconstitution mathematics are essential for maintaining experimental precision when handling a 30mg peptide mass. Because 30mg yields a substantial concentration of active solute per milliliter, minor volumetric variances in diluent addition can significantly alter the target working concentration. Researchers should utilize a calibrated reconstitution calculator prior to solvent delivery.

To achieve target working concentrations from a 30mg lyophilized cake, consider the following standard volumetric additions using sterile bacteriostatic water (0.9% benzyl alcohol) or sterile 0.9% sodium chloride solution:

1. Reconstitution with 1.0 mL Diluent: Yields a final concentration of 30.0 mg/mL (30,000 µg/mL or 30 µg/µL). This hyper-concentrated stock is ideal for low-volume micro-pipetting into high-density cell culture plates or preparing master stock solutions for deep-freeze storage.

2. Reconstitution with 2.0 mL Diluent: Yields a final concentration of 15.0 mg/mL (15,000 µg/mL or 15 µg/µL). This intermediate density offers an optimal balance between low volumetric pipetting resistance and manageable volumetric aliquoting.

3. Reconstitution with 3.0 mL Diluent: Yields a final concentration of 10.0 mg/mL (10,000 µg/mL or 10 µg/µL). A 10 mg/mL concentration simplifies decimal calculations in automated dosing protocols, where 100 µL of solution precisely delivers 1.0 mg of peptide.

Aliquot Planning and Solution Stability Management

Once a 30mg Selank vial is reconstituted, the liquid working solution becomes susceptible to enzymatic, thermal, and mechanical degradation. Repeated freeze-thaw cycles break peptide bonds, disrupt tertiary interaction geometry, and accelerate aggregate formation, leading to compromised assay reproducibility. Therefore, proper aliquot planning is critical immediately following diluent delivery.

Upon full dissolution of the lyophilized cake—achieved by gentle inversion rather than vigorous vortexing—the stock solution should be divided into single-use micro-centrifuge aliquots using sterile, low-binding polypropylene tubes. Aliquots designated for immediate use within 48 to 72 hours should be refrigerated at 2°C to 8°C. Long-term storage aliquots must be rapidly frozen at -20°C or -80°C. Working stocks should only be thawed once immediately prior to execution of the assay protocol.

PX1 Quality Assurance: Third-Party COA and Mass Spec Protocols

PX1 Research enforces strict quality control standards for every production batch of research peptides. Every fill lot—whether packed into standard single-unit vials or high-mass 30mg formats—undergoes rigorous analytical verification at an independent, ISO 17025 accredited laboratory prior to release.

To verify product integrity, researchers can access our public COA database to review lot-matched analytical documentation. Each Certificate of Analysis provides two critical analytical tests:

1. High-Performance Liquid Chromatography (HPLC): Confirms chemical purity by measuring the area under the curve (AUC). PX1 mandates a baseline purity threshold of ≥98.0% for all catalog compounds.

2. Mass Spectrometry (MS): Electrospray ionization mass spectrometry (ESI-MS) confirms the exact molecular weight (751.9 Da ± 0.5 Da), verifying the absence of incomplete synthesis fragments or sequence deletions.

Additionally, PX1 conducts kinetic chromogenic LAL assays to ensure endotoxin levels remain strictly below <0.05 EU/mg, protecting delicate in vitro cell models and animal research subjects from lipopolysaccharide-induced inflammatory artifacts.

Comparative Analysis: Selank and Related Neuro-Peptides

In neuro-pharmacological and immunological research, laboratory investigators frequently compare Selank alongside other synthetic or native peptide sequences within the same functional class. Understanding these structural and functional differences allows researchers to design targeted comparative assays.

For instance, Semax is an ACTH(4-10) analog widely evaluated for its neuroprotective and cognitive modulation properties in rodent ischemia and hypoxia models. While Selank derives from the immunomodulatory fragment tuftsin, Semax acts predominantly through melanocortin receptor pathways and neurotrophin expression modulation.

Similarly, N-Acetyl Selank Amidate represents a second-generation acetylated and amidated modification of the core Selank sequence. The addition of N-terminal acetyl and C-terminal amide groups increases enzymatic resistance against serum proteases, extending the functional half-life in biological media compared to native Selank. Researchers examining baseline immune modulation often incorporate original Tuftsin sequence controls to isolate the specific neurotropic contributions of the Pro-Gly-Pro tail addition.

Storage Protocols and Degradation Pathways

Lyophilized Selank 30mg vials exhibit high thermodynamic stability when stored correctly upon arrival. Unreconstituted vials should be kept in a climate-controlled freezer at -20°C for up to 24 months. Desiccant packs must be maintained inside secondary storage containers to prevent moisture absorption through the rubber stoppers.

Lyophilized cakes stored at room temperature (20°C to 25°C) remain stable for short transit windows (up to 30 days), allowing PX1 Research to ship compounds safely via express logistics. Upon receipt, immediate transfer to sub-zero refrigeration is recommended. Exposure to direct ultraviolet light, high heat, or oxygen exposure due to compromised vial seals will initiate hydrolysis of peptide bonds and deamidation cascades, reducing active compound potency.

Selecting Diluents and Micro-Pipetting Protocols

The choice of solvent depends on the specific downstream application outlined in your laboratory's protocol. For multi-day in vitro cell culture studies, sterile non-preserved 0.9% Sodium Chloride or Sterile Water for Injection (SWFI) is typically preferred to avoid cellular toxicity associated with preservative agents.

Conversely, when preparing multi-dose stock solutions for longitudinal in vivo rodent protocols spanning several weeks, Bacteriostatic Water containing 0.9% Benzyl Alcohol is recommended. The benzyl alcohol acts as a bacteriostatic agent, preventing microbial growth within the reconstituted vial during repeated septum punctures with sterile syringes. Always sanitize the vial's aluminum flip-off cap and butyl rubber stopper with 70% isopropyl alcohol before needle entry.

Sizing Strategy: 10mg vs 30mg Vial Selection

Choosing between a standard 10mg format and a high-mass 30mg format depends directly on research design, operational batch size, and budget efficiency. For exploratory assays, pilot studies, or protocols requiring low peptide mass per trial, the Selank 10mg format minimizes the risk of unused reconstituted solution degrading over time.

For expanded preclinical screening programs, high-density cell culture plates, or continuous automated pipetting platforms, a 30mg vial offers distinct advantages. High-mass vials reduce packaging waste, streamline inventory management, minimize per-milligram acquisition costs, and ensure consistent batch chemistry across large assay sets. To learn more about customized bulk allocations or institutional pricing schedules, visit our research portal or contact the PX1 support team.

PX1 Research Logistics and USA Supply Chain Standards

PX1 Research operates state-of-the-art dispatch facilities in California and Arizona, ensuring fast, reliable delivery across the United States. All orders placed Monday through Friday before 3:00 PM PST are packed under cleanroom conditions and shipped same-day.

Every shipment is packed in temperature-controlled, shock-absorbent packaging to maintain product stability during transit. By manufacturing and testing exclusively within USA-based GMP-compliant facilities and ISO 17025 accredited laboratories, PX1 Research provides institutional researchers with reproducible quality, transparent batch tracking, and full analytical verification for all research peptides.