Semax raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2025-08-21. Anything still debated is marked as such rather than presented as settled.
Development is attributed to researchers at the Institute of Molecular Genetics in Moscow during the early 1980s, building on earlier Soviet work with ACTH fragments. Russian regulatory approval followed for intranasal use, and the compound has remained commercially available there for decades. Most published human data originate from Russian and, later, some Eastern European clinical reports, which are not always accessible in English translation. Outside that region the material is generally handled as a research chemical rather than a licensed medicine.
Regulatory status differs sharply between jurisdictions. In Russia the peptide is registered as a prescription nasal preparation, while agencies such as the United States Food and Drug Administration have not approved it for any indication. Products sold elsewhere are typically labeled for laboratory research only, and such labels shift responsibility for safe handling to the purchaser. Because the same name covers pharmaceutical-grade nasal drops and bulk research powder, identity and purity documentation becomes the main practical concern when comparing sources.
Purity assessment relies mainly on reversed-phase high-performance liquid chromatography, which separates the target heptapeptide from truncated sequences, deletion analogues, and oxidised forms. Mass spectrometry, usually coupled to liquid chromatography, confirms identity through the expected molecular ion and reveals modifications such as methionine sulfoxide formation. Amino acid analysis can verify composition, and tandem mass spectrometry supports sequence confirmation. Ultraviolet detection near 254 to 280 nanometres is convenient because the phenylalanine and histidine residues absorb in that region. Nuclear magnetic resonance is rarely used for routine release testing.
Common degradation pathways include oxidation of the methionine side chain, hydrolysis of the peptide backbone, and aggregation under unfavourable pH or concentration. Stability studies typically monitor the main peak by chromatography and report total related substances as a percentage. Because no official monograph exists, acceptance criteria vary between laboratories, and reported purity values are not directly comparable across suppliers. Analysts therefore document the method, column, and detection wavelength alongside each result, and open questions remain about how much biological activity the oxidised forms retain.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic heptapeptide (ACTH fragment analog) | Not a steroid; does not belong to the melanocortin agonist drugs by marketing category |
| Molecular formula | C37H51N9O10S (commonly cited) | Reported values vary slightly with salt and counter-ion content |
| Appearance | White to off-white lyophilized powder | A single batch may appear as a loose cake or fluffy solid |
| Solubility | Freely soluble in water and aqueous buffer | Stock solutions are usually prepared in sterile water or saline |
| Typical storage | −20 °C or below, desiccated and protected from light | Seal opened vials promptly to limit moisture uptake |
当时的短肽研究普遍关注能否穿越血脑屏障、在低剂量下产生中枢效应，Semax 属于这一路线。鼻内给药是其主要使用方式，俄语文献报道的适应症涵盖缺血性卒中、短暂性脑缺血发作、认知功能减退以及视神经病变。这些研究大多发表在当地期刊上，样本规模与终点设置同西方试验惯例存在差异，国际同行对其临床证据的强度看法不一。
各国监管态度分化明显。俄罗斯按处方药管理，部分东欧国家留有使用记录；欧盟与美国未批准其作为药物上市，市面流通品通常标注为研究用化学品。身份差异意味着标示含量、纯度与无菌性缺少统一核查。体育领域还牵涉反兴奋剂名录，跨境携带则受目的地药品法规约束。
Lyophilised powder is normally kept at -20 °C in a desiccated container, with some suppliers recommending -80 °C for long-term archival storage. Repeated freeze-thaw cycles are the most common cause of avoidable loss, so aliquoting before freezing reduces variability between working sessions. Dissolved peptide is far less stable than the dry solid and is usually prepared fresh or held briefly at 4 °C. Aqueous solutions support both hydrolysis of the backbone and oxidation of the N-terminal methionine, and these two routes dominate degradation under ordinary laboratory conditions.
Identity and purity are confirmed with reversed-phase high-performance liquid chromatography, typically monitored at 214 nanometres where the peptide bond absorbs. Mass spectrometry, either electrospray or MALDI-TOF, verifies molecular mass against the theoretical value and detects truncation or adduct formation. Amino acid analysis and peptide mapping provide additional confirmation when required. The most frequently reported impurities are deletion sequences from incomplete coupling, methionine sulfoxide from oxidation, and dimeric species formed through non-covalent aggregation. Impurity profiles depend strongly on the synthesis and purification route chosen by the producer.
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. It corresponds to the ACTH(4-7) fragment extended at the C-terminus by a Pro-Gly-Pro tripeptide, an addition intended to slow enzymatic breakdown. The molecular formula is C37H51N9O10S and the molecular mass is approximately 814 daltons. In the literature it is often described as an ACTH(4-10) analog, although that label reflects a naming convention as much as a precise structural relationship. The compound was developed in Russia and remains most closely associated with that research tradition.
Laboratory descriptions of the material are consistent across suppliers. It appears as a white to off-white lyophilized powder that dissolves readily in water and in polar organic solvents such as dimethyl sulfoxide. Aqueous solutions are clear and colorless at low concentrations. Because the peptide contains methionine, oxidation at the sulfur atom is a recognized degradation pathway, and handling notes usually call for protected, desiccated storage. Reported purity for research-grade lots is generally above 95 percent as measured by reversed-phase high-performance liquid chromatography.
The compound is registered in Russia as a pharmaceutical product, most commonly formulated as a nasal solution, and has been used in that setting since the 1990s. Outside that jurisdiction it is generally handled as a research chemical rather than an approved medicine. Regulatory status therefore differs sharply between countries, and material sold internationally may not correspond to the Russian pharmaceutical formulation. Documentation with commercial samples is typically limited to a certificate of analysis covering purity and identity, not clinical status or local legal classification.
=== 2017 === In April 2017, Chipotle first announced that their point of sale payment system was compromised during a three-week period from late March to mid-April but gave very little information about the incident. The following month, the company later revealed that 2,250 restaurants in 47 states were involved which could potentially affect hundreds of thousands of customers who may had their credit or debit card account information with security codes stolen. A few restaurants in Canada were also affected. Some security experts criticized the way Chipotle had downplayed the incident. During the same month, a credit union in New Hampshire filed a class action lawsuit on the behalf of banks and credit unions against Chipotle for failure to provide elementary credit card data security in the most recent data breach after a similar data breach that had occurred in 2004. In July 2017, Gainesville, Florida, police reported that an unidentified person took more than $17,000 from an ATM at a local credit union by stealing from 40 different accounts that can be traced directly to the data breach.
=== Phase 1 === (R)-MDMA ((R)-midomafetamine; MM-402) – serotonin, norepinephrine, and dopamine releasing agent and weak serotonin 5-HT2A, 5-HT2B, and 5-HT2C receptor agonist (entactogen and weak psychedelic hallucinogen) STP-1 (STALICLA Therapeutic Package 1) – phosphoric diester hydrolase inhibitor and sodium–potassium–chloride symporter inhibitor Sulforafan alfadex (sulforaphane alfadex; sulforafan α-cyclodextrin; SFX-01, STP-2; broccoli sprout extract) – various actions
=== Incomplete conversion === Bisulfite sequencing relies on the conversion of every single unmethylated cytosine residue to uracil. If conversion is incomplete, the subsequent analysis will incorrectly interpret the unconverted unmethylated cytosines as methylated cytosines, resulting in false positive results for methylation. Only cytosines in single-stranded DNA are susceptible to attack by bisulfite, therefore denaturation of the DNA undergoing analysis is critical. It is important to ensure that reaction parameters such as temperature and salt concentration are suitable to maintain the DNA in a single-stranded conformation and allow for complete conversion. Embedding the DNA in agarose gel has been reported to improve the rate of conversion by keeping strands of DNA physically separate. Incomplete conversion rates can be estimated and adjusted-for after sequencing by including an internal control in the sequencing library, such as lambda phage DNA (which is known to be unmethylated) or by aligning bisulfite sequencing reads to a known unmethylated region in the organism, such as the chloroplast genome.
=== Amine hormones === Hormones derived from the modification of amino acids are referred to as amine hormones. Typically, the original structure of the amino acid is modified such that a –COOH, or carboxyl, group is removed, whereas the –NH+3, or amine, group remains. Amine hormones are synthesized from the amino acids tryptophan or tyrosine.
=== Post-2003 === Production ended on 2 October 2003 and the whole Familia line were replaced by the Mazda3 in the same month. The eighth generation Familia continued to be produced by Ford Lio Ho in Taiwan as the "Mazda Isamu Genki" until 2008 (sold as hatch and saloon and with little or no styling differences to the original 1998 production model). It was also badged as the "Ford Activa", which, unlike the Ford Laser, had no styling changes from the 323, except for the badges. In Southeast Asia, a version of the last Laser continued to be assembled in Indonesia, Malaysia, and the Philippines as the Ford Lynx. This generation remained in production in some South American countries (Ecuador, Colombia, and Venezuela), badged as the Mazda Allegro. Each Allegro keeps in the styling of the last generation 323/Protegé/Astina/Familia. In Colombia, production of the Mazda 323 continued until 2003, built by its local subsidiary, the Compañía Colombiana Automotriz. Chinese company FAW Haima Automobile Co., Ltd. produces a restyled version of the Familia/323 called Haima Family from 2003 to 2010. It is equipped with a 1.6 L petrol engine mated with a five-speed manual or a four-speed automatic gearbox. Another version called the Haima Happin went on sale from 2008 to 2012 model years with a facelift for 2011 and 2012 models. The Happin was equipped with a 1.3 L, 1.5 L, and 1.6 L engine options and a five-speed manual gearbox.
Sources: en.wikipedia.org
=== Design === Designing DNA-binding proteins that have a specified DNA-binding site has been an important goal for biotechnology. Zinc finger proteins have been designed to bind to specific DNA sequences and this is the basis of zinc finger nucleases. Recently transcription activator-like effector nucleases (TALENs) have been created which are based on natural proteins secreted by Xanthomonas bacteria via their type III secretion system when they infect various plant species.
=== Laboratory synthesis === The chemical synthesis of DMT has been described. It can be synthesized through several possible pathways from different starting materials. The two most commonly encountered synthetic routes are through the reaction of indole with oxalyl chloride followed by reaction with dimethylamine and reduction of the carbonyl functionalities with lithium aluminium hydride to form DMT. The second commonly encountered route is through the N,N-dimethylation of tryptamine using formaldehyde followed by reduction with sodium cyanoborohydride or sodium triacetoxyborohydride. Sodium borohydride can be used but requires a larger excess of reagents and lower temperatures due to it having a higher selectivity for carbonyl groups as opposed to imines. Procedures using sodium cyanoborohydride and sodium triacetoxyborohydride (presumably created in situ from cyanoborohydride though this may not be the case due to the presence of water or methanol) also result in the creation of cyanated tryptamine and beta-carboline byproducts of unknown toxicity while using sodium borohydride in absence of acid does not. Bufotenine, a plant extract, can also be synthesized into DMT. Alternatively, an excess of methyl iodide or methyl p-toluenesulfonate and sodium carbonate can be used to over-methylate tryptamine, resulting in the creation of a quaternary ammonium salt, which is then dequaternized (demethylated) in ethanolamine to yield DMT. The same two-step procedure is used to synthesize other N,N-dimethylated compounds, such as 5-MeO-DMT.
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Pompilidotoxins (PMTXs) are toxic substances that can only be found in the venom of several solitary wasps. This kind of wasp uses their venom to offensively capture prey and is relatively harmless to humans. This is in stark contrast to social insects that defend themselves and their colonies with their venom. The pompilidotoxin producing wasps are part of the Pompilinae subfamily which consists of fifty known genus groups of which only two groups are known to produce the toxin. Both groups produce different variants. The first notice of a pompilidotoxin variant was made by Konno et.al in 1997 after a survey was conducted of neurotoxins in solitary wasps that inhabit Japan. He purified and synthesised this toxin, now called α-pompilidotoxin from the solitary spider wasp (Anoplius samariensis). The second, closely related variant, β-pompilidotoxin, was found by Konno et.al. a year later in 1998 in another solitary wasp (Batozonellus maculifrons) In this year Konno et.al. also shed concrete light on the structure and function of these toxins. Anoplius samariensis is known to live distributed over the globe with reported cases in east-Asia, east and central Europe, and Russia. It produces the α-PMTX to act upon the nervous system of a stung victim. This way they can paralyse a wide range of spiders that will then be dragged to the wasp's nest that is located in the ground, in a cavity of a plant stem, or made from mud. The spider wasp lays its eggs on paralysed spiders so that the hatching larvae can feed on living prey.
Sources: en.wikipedia.org
It is a short synthetic peptide built from seven amino acids: methionine, glutamic acid, histidine, phenylalanine and three prolines. The sequence derives from the 4-10 fragment of adrenocorticotropic hormone with an added proline-glycine-proline tail. No plant or animal extract is involved; the material is produced by solid-phase peptide synthesis.
It was developed in the Soviet Union during the early 1980s by groups at the Institute of Molecular Genetics in Moscow. Russian approval for intranasal use followed, and it has been marketed there since. Western laboratories encountered it mainly through translated literature and, later, through online research-chemical trade.
It holds a Russian registration as a prescription nasal product but has no approval from the European Medicines Agency or the United States Food and Drug Administration. Buyers outside Russia usually receive material sold strictly for laboratory research. That distinction matters because research-grade and pharmaceutical-grade products carry different documentation and testing expectations.
Dry powder is usually kept at about -20 degrees Celsius for long-term storage and at 2 to 8 degrees Celsius for short working periods. Containers should stay sealed and protected from light and moisture to limit degradation.