Where to Buy N-Acetyl Semax Amidate: Vendor Comparison & Research Info

N-Acetyl Semax Amidate is an advanced, synthetically modified heptapeptide derived from Semax, a neuropeptide originally engineered by researchers at the Institute of Molecular Genetics of the Russian Academy of Sciences. Semax itself was developed based on the structure of Adrenocorticotropic Hormone fragment 4–10 (ACTH4-10), a naturally occurring sequence recognized for its central nervous system signaling and neuroregulatory capabilities.

While native Semax represents a significant breakthrough in neuropharmacology, its susceptible terminal ends leave it vulnerable to rapid cleavage by endogenous peptidases. N-Acetyl Semax Amidate addresses this pharmacokinetic limitation by incorporating two strategic structural enhancements: N-terminal acetylation and C-terminal amidation.

By capping both ends of the core sequence, N-Acetyl Semax Amidate exhibits enhanced resistance to circulating aminopeptidases and carboxypeptidases, extending its functional half-life and enzymatic stability in laboratory assays. Supplied as a pristine lyophilized powder at  >98% analytical purity, this 30 mg presentation serves as a high-precision research tool for in vitro, ex vivo, and preclinical laboratory studies evaluating neuroplasticity, neurotrophin upregulation, synaptic transmission, and neuroprotective cascades.

Molecular Structure & Peptide Engineering

To understand the functional advantages of N-Acetyl Semax Amidate, researchers must examine its primary sequence and the specific chemical modifications applied to its terminal ends.

• The Core Sequence (Met-Glu-His-Phe-Pro-Gly-Pro): The underlying sequence preserves the active heptapeptide structure of Semax. The first four amino acids (Met-Glu-His-Phe) match the adrenocorticotropic hormone fragment , which provides the essential sequence required for central receptor binding and neurotrophic activation. The C-terminal tripeptide tail (Pro-Gly-Pro) provides structural stabilization against metabolic breakdown while preserving central activity without triggering peripheral endocrine or adrenal activity.

• N-Terminal Acetylation (Ac-): Attaching an acetyl group (CH3CO-) to the -terminal methionine residue blocks the free amine (NH2) terminus. This modification neutralizes the positive charge at the N-terminus and prevents recognition and enzymatic cleavage by ubiquitous circulating aminopeptidases.

• C-Terminal Amidation (-NH2): Replacing the standard C-terminal carboxylic acid (-COOH) with a primary carboxamide group (-CONH2) eliminates the negative charge at the C-terminus. This protects the peptide from degradation by carboxypeptidases and increases its lipophilicity, improving its capacity to cross lipid membranes in experimental models.

Pharmacodynamics & Mechanism of Action

N-Acetyl Semax Amidate exerts its primary effects by modulating central neurotrophic pathways, regulating neurotransmitter dynamics, and protecting neuronal networks against metabolic and oxidative stress.

1. Neurotrophin Expression & Trk Signaling

The primary pathway influenced by Semax analogs involves the dramatic upregulation of key neurotrophic factors within central brain structures, particularly the hippocampus and basal forebrain:

• Brain-Derived Neurotrophic Factor (BDNF): Rapidly increases local BDNF expression and stimulates Tropomyosin receptor kinase B (TrkB) autophosphorylation. This activates downstream  and  cascades that support dendritic branching, spine density, and long-term potentiation (LTP).

• Nerve Growth Factor (NGF): Upregulates NGF synthesis and downstream  receptor activation, supporting the maintenance, survival, and axonal sprouting of cholinergic neurons.

2. Neurotransmitter System Modulation

Research models indicate that Semax analogs regulate central monoaminergic and cholinergic pathways without causing receptor down-regulation or dependence:

• Dopaminergic Pathways: Modulates striatal dopamine turnover and enhances dopamine synthesis under stress conditions, preserving cognitive processing speed and motivation-driven behaviors.

• Cholinergic Function: Enhances high-affinity choline uptake and acetyltransferase activity in the basal forebrain, maintaining acetylcholine levels required for memory consolidation and attention.

3. Neuroprotection & Oxidative Stress Resilience

In models of ischemia, hypoxia, and neurotoxicity, N-Acetyl Semax Amidate helps preserve neuronal viability by modulating inflammatory and oxidative cascades. It suppresses pro-inflammatory cytokines (IL-1beta, TNF-alpha), reduces reactive oxygen species (ROS) accumulation, and stabilizes mitochondrial membrane potential under conditions of metabolic deprivation.

Primary Laboratory Research Domains

1. Neuroplasticity & Cognitive Biology

Researchers utilize N-Acetyl Semax Amidate to study the molecular mechanisms of learning, memory formation, and synaptic adaptation. In vitro slice preparations and animal behavioral models allow scientists to trace how elevated BDNF/TrkB signaling directly alters post-synaptic density and enhances long-term potentiation () in hippocampal networks.

2. Ischemic Injury & Hypoxia Models

Because Semax was originally researched for cerebrovascular applications, its stabilized analogs are widely used in focal cerebral ischemia and hypoxia models. Researchers investigate how terminal stabilization enhances the peptide's capacity to reduce infarct volume, protect blood-brain barrier integrity, and prevent ischemic neuronal apoptosis.

3. Neurodegenerative Pathways & Cellular Resilience

Investigational studies examine the peptide in models of neurodegenerative decline, evaluating its capacity to mitigate neuroinflammation, reduce excitotoxic glutamate accumulation, and protect cholinergic neurons from progressive degeneration.

4. Peptide Chemistry & Pharmacokinetic Optimization

Beyond neuroscience, N-Acetyl Semax Amidate serves as a model compound in peptide engineering. Medicinal chemists study the peptide to evaluate how dual terminal modifications alter enzymatic half-life, systemic bioavailability, and membrane permeability compared to unmodified reference peptides.

Technical Specifications & Analytical Parameters

• Chemical Name: N-Acetyl Semax Amidate

• Sequence Format: Ac-Met-Glu-His-Phe-Pro-Gly-Pro-NH2

• CAS Registry Number: 1000307-28-5 (Base Sequence)

• Molecular Formula: C39H53N9O10S

• Molecular Weight: 839.96 g/mol

• Purity Level:  (HPLC verified)

• Identity Verification: Mass Spectrometry () & High-Performance Liquid Chromatography (HPLC)

• Physical Appearance: Lyophilized, white to off-white cake/powder

• Net Quantity: 30.0 mg per serum vial

• Solubility Profile: Soluble in sterile water, saline, or buffered aqueous media ()

• Recommended Storage: Store at  (desiccated, dark environment)

• Lyophilized Shelf Life:  >3 years under specified frozen conditions

Product Quality & Handling

• High Analytical Purity: Batch-tested via High-Performance Liquid Chromatography (HPLC) and Mass Spectrometry (MS) to ensure high consistency and exact molecular weight verification.

• Lyophilized Format: Freeze-dried under nitrogen to ensure long-term physical stability, clean reconstitution, and defense against ambient moisture degradation.

Reconstitution Protocol

1. Equilibration: Allow frozen vials to reach ambient room temperature (20C-25C) before opening to prevent moisture condensation.

2. Reconstitution: Add sterile water or phosphate-buffered saline (PBS, pH 7.4) gently down the inner glass wall of the vial.

3. Dissolution: Gently swirl the vial in a circular motion until fully dissolved. Do not vortex vigorously.

4. Storage: Aliquot reconstituted solutions into sterile polypropylene tubes and store at  or  for long-term stability. Avoid repeated freeze-thaw cycles.

Research Disclaimer: N-Acetyl Semax Amidate is supplied strictly for laboratory research and scientific evaluation. It is not intended for human or veterinary consumption, therapeutic administration, or diagnostic use. Handling must be performed by qualified research personnel.