Semax 5mg — Vial Spec, Reconstitution Math & COA

Overview of Semax 5mg Vial Specifications and Catalog Status

In specialized laboratory settings, the 5mg vial format of Semax serves as a targeted quantity for initial assay development, pilot binding studies, or baseline spectroscopic characterization. Containing 5 milligrams of high-purity lyophilized peptide cake, this unit size allows investigators to prepare low-volume working solutions without subjecting larger stock quantities to repeated freeze-thaw cycles or extended storage post-reconstitution.

To maintain maximal integrity during transit and storage, each vial is stoppered under an inert argon atmosphere and sealed with an aluminum flip-off cap. While PX1 Research frequently manufactures custom small-batch quantities, investigators seeking larger operational volumes for high-throughput or long-term studies often opt for our standard high-yield Semax 30mg format. Researchers can evaluate our full inventory of certified compounds across the complete all peptides catalog to select the appropriate unit scale for their specific experimental matrix.

Chemical Structure, Molecular Weight, and Physical Properties

Semax is a synthetic heptapeptide derived from a fragment of adrenocorticotropic hormone (ACTH 4-10) with the amino acid sequence Met-Glu-His-Phe-Pro-Gly-Pro. By structural design, the C-terminal Pro-Gly-Pro tripeptide sequence is incorporated to enhance resistance against endogenous peptidases, thereby extending the structural half-life of the core peptide backbone in biological matrices.

The molecular formula of Semax is C37H51N9O10S, possessing a calculated molecular mass of 810.9 g/mol. In its lyophilized state, the compound appears as a white to off-white dense cake or powder. It exhibits high solubility in aqueous buffers, including sterile bacteriostatic water, 0.9% sodium chloride, and phosphate-buffered saline (PBS), forming clear, colorless solutions when reconstituted under sterile conditions.

Preclinical Mechanisms and Signal Transduction Pathways

In vitro data indicate that Semax modulates several neurotrophic signaling pathways, most notably triggering the expression of Brain-Derived Neurotrophic Factor (BDNF) and Nerve Growth Factor (NGF) along with their cognate receptor, Tropomyosin receptor kinase B (TrkB). Preclinical studies suggest that exposure to Semax in neuronal cell cultures alters mRNA transcription levels within hippocampal tissue models, promoting cellular signaling cascades associated with neuronal plastic response.

Additionally, preclinical investigations in rodent models indicate that Semax interacts with melanocortin receptors (MC4R and MC5R) as a candidate agonist, while concurrently modulating baseline levels of primary monoamines (dopamine and serotonin) within discrete brain regions. In vitro enzymatic assays further show that the peptide partially inhibits carboxypeptidase and enkephalin-degrading enzymes, prolonging the activity of endogenous regulatory peptides in tissue preparations.

Precision Laboratory Reconstitution Math for 5mg Vials

Accurate concentration calculations are vital for maintaining reproducibility across benchtop assays. When reconstituting a 5mg vial of Semax, liquid handling parameters depend on the volume of diluent added. Reconstitution should always be conducted using a sterile syringe, directing the diluent gently against the glass vial wall rather than directly onto the lyophilized cake.

Standard volumetric additions for a 5mg (5,000 µg) vial yield the following target concentrations:

• 1.0 mL Diluent Volume: Reconstitution with 1.0 mL of diluent produces a final concentration of 5.0 mg/mL (5,000 µg/mL). A 10 µL pipetted aliquot delivers exactly 50 µg of active peptide.

• 2.0 mL Diluent Volume: Reconstitution with 2.0 mL of diluent produces a final concentration of 2.5 mg/mL (2,500 µg/mL). A 10 µL pipetted aliquot delivers 25 µg of active peptide.

• 3.0 mL Diluent Volume: Reconstitution with 3.0 mL of diluent produces a final concentration of 1.67 mg/mL (1,666.7 µg/mL). A 10 µL pipetted aliquot delivers approximately 16.67 µg of active peptide.

To quickly recalculate custom diluent volumes, micro-aliquots, or molarity adjustments, investigators can utilize the PX1 interactive reconstitution calculator prior to fluid handling.

Aliquot Planning, Handling, and Long-Term Storage Protocols

Lyophilized Semax 5mg vials should be stored upon arrival at -20°C for short-term preservation or -80°C for long-term storage, shielded from light exposure. Under these desiccated, sub-zero conditions, the peptide maintains structural stability and resists hydrolytic cleavage for extended periods.

Once reconstituted with bacteriostatic water (containing 0.9% benzyl alcohol), the solution should be stored at 2°C to 8°C and utilized within 30 days. To avoid performance loss caused by repeated freeze-thaw cycles when working with non-preserved diluents (such as sterile water for injection), the reconstituted solution should be immediately divided into single-use micro-aliquots using polypropylene low-protein-binding tubes and frozen at -20°C.

Comparative Analysis: Semax vs. Class-Related Nootropic Peptides

When designing comparative research assays evaluating central nervous system peptide activity, researchers frequently examine Semax Alongside structural or functional analogs within the same research class. For instance, Selank is an immunomodulatory heptapeptide derived from Tuftsin that targets GABAergic transmission rather than primary neurotrophin synthesis. Meanwhile, modified variants like N-Acetyl Semax Amidate incorporate N-terminal acetylation and C-terminal amidation to resist enzymatic cleavage even more effectively than unmodified Semax in vitro. In contrast, non-ACTH-derived compounds such as P21 peptide, an engineered fragment of Ciliary Neurotrophic Factor (CNTF), operate via distinct pathways to promote neurogenesis. Evaluating these distinct biochemical profiles side-by-side allows laboratory researchers to isolate specific receptor-mediated responses.

Analytical Quality Verification: HPLC, MS, and Endotoxin Standards

PX1 Research enforces stringent quality control mandates to ensure every lot of Semax meets strict analytical benchmarks. Every batch manufactured in our USA-based GMP-compliant facilities undergoes independent validation by an accredited ISO 17025 laboratory prior to clearance for distribution.

Identity and purity are verified using High-Performance Liquid Chromatography (HPLC), confirming a chemical purity profile exceeding 99.0%. Mass identity is verified via Matrix-Assisted Laser Desorption/Ionization Time-of-Flight (MALDI-TOF) mass spectrometry, ensuring the molecular mass matches the theoretical value of 810.9 Da. Furthermore, routine Limulus Amebocyte Lysate (LAL) testing guarantees that endotoxin levels remain strictly below <0.05 EU/mg, minimizing background interference in cellular assays. Investigators can review full lot-matched analytical data on our dedicated COA documentation portal.

Vial Format Selection: Evaluating 5mg vs. 30mg for Protocol Design

Choosing between a 5mg vial and a larger unit capacity depends primarily on project scale, pipetting frequency, and budget optimization. The 5mg vial is ideal for low-volume bench work, single-plate ELISA assays, or preliminary stability testing where fresh reconstitution is required for each short experiment run.

Conversely, high-throughput screening applications, multi-plate receptor binding studies, or multi-week preclinical animal models generally benefit from larger unit volumes. For these broader protocols, utilizing Semax 30mg minimizes batch-to-batch reconstitution variability while providing superior unit economy. Institutional laboratories planning large-scale research projects can also request custom batch fulfillment through our wholesale accounts department.

Experimental Protocol Safety and Reagent Waste Management

All laboratory procedures involving Semax 5mg should be conducted inside a certified biosafety cabinet or laminar flow hood by trained research personnel wearing appropriate personal protective equipment (PPE), including nitrile gloves, lab coats, and safety eyewear. Disposable materials contaminated with peptide solutions should be disposed of in accordance with institutional biohazardous and chemical waste guidelines.

PX1 Research ships all research compounds from state-of-the-art logistics hubs in California and Arizona, utilizing same-day dispatch for orders confirmed Monday through Friday before cut-off times. All compounds are supplied exclusively for laboratory research, development, and analytical testing.