Everything below concerns HPLC purity. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2025-10-17. Numbers and descriptions here follow the published literature rather than marketing material.
The compound is described in the literature as a derivative of epithalamin, a preparation obtained from bovine pineal tissue. Work on this peptide family was carried out mainly by a research group in Saint Petersburg beginning in the 1980s, and the substance was later registered for clinical use in Russia under the name Epitalon. Outside that region it is generally treated as a research chemical rather than an approved medicine. Statements about its biological activity rest on a relatively small number of studies, and independent replication remains limited.
In its supplied form epitalon is a white to off-white powder, usually lyophilized and often hygroscopic. It dissolves readily in water and in aqueous buffers, and it is commonly handled as the acetate or trifluoroacetate salt to improve stability during purification and drying. The amide backbone is labile in aqueous media, so solutions are less durable than the dry solid. Handling notes in the chemical literature therefore emphasize keeping the powder dry, cool and shielded from light until it is dissolved.
Storage recommendations center on limiting moisture, heat, and light. The dry powder is generally kept at minus 20 degrees Celsius, and some suppliers recommend minus 80 degrees for long-term archival. Once dissolved, solutions are usually aliquoted and frozen to avoid repeated freeze-thaw cycles, which can promote aggregation or degradation. Aqueous stability depends on pH and concentration, and buffered saline is often preferred over plain water for biological work. Stability data specific to epitalon remain limited, so general peptide-handling practices are applied by analogy rather than from product-specific validation.
Epitalon is a synthetic tetrapeptide with the sequence alanine-glutamate-aspartate-glycine, abbreviated AEDG. Its molecular formula is C14H22N4O9 and its calculated monoisotopic mass is approximately 390.35 daltons. The compound does not occur naturally as a free peptide; it is produced by solid-phase peptide synthesis. Because it contains two acidic residues and no basic residues, the neutral form carries a net negative charge at physiological pH. This charge profile influences how the peptide behaves in solution and during chromatographic analysis.
Laboratory-grade epitalon is typically supplied as a lyophilized powder. Purity is commonly assessed with reverse-phase high-performance liquid chromatography, often paired with mass spectrometry to confirm molecular identity. Amino acid analysis and peptide mapping can provide additional confirmation of sequence. Certificates of analysis for research materials frequently report purity above 95 percent, although the methods behind such figures vary between suppliers. The absence of a pharmacopeial monograph means that no single standardized assay defines the compound, so reported results depend on the analytical protocol chosen.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic tetrapeptide | Four residues, linear chain |
| Residue sequence | Ala-Glu-Asp-Gly | Single-letter form AEDG |
| Calculated mass | 390.3 daltons | Value for the free, uncharged form |
| Appearance | White to off-white powder | Usually supplied lyophilized |
| Solubility | Freely soluble in water | Often handled as a salt form |
The compound is generally presented as a synthetic fragment of epithalamin, a pineal gland extract investigated in the former Soviet Union from the 1970s onward. Vladimir Khavinson and colleagues in Saint Petersburg developed short peptides modelled on such extracts, and epitalon became the most widely cited of those sequences. Most primary reports appeared in Russian-language journals or in proceedings with limited international circulation. Independent replication in laboratories outside that network remains sparse, and much repeated secondary material traces back to a small number of originating groups.
Laboratory work has examined effects on telomerase activity in cultured cells, on melatonin rhythms in animals, and on markers of oxidative stress. Some experiments report measurable changes while others show none, and the reported findings rest largely on small studies. The absence of large independent trials means the generality of these results is unresolved rather than settled. Review articles occasionally apply the label geroprotector, a term that reflects a research hypothesis about ageing rather than an established clinical finding.
Material supplied for laboratory use is normally a lyophilised white to off-white powder that dissolves readily in water and in isotonic saline. Lyophilised cakes are hygroscopic and should be equilibrated to room temperature before opening to limit condensation on the solid. Solutions are typically prepared at milligram-per-millilitre concentrations and divided into single-use aliquots, because repeated freeze–thaw cycles degrade short peptides. Aqueous solutions are far less stable than the dry powder, and identity is usually verified by mass spectrometry alongside purity estimation from reversed-phase high-performance liquid chromatography.
Epitalon is a synthetic linear tetrapeptide with the sequence alanine–glutamate–aspartate–glycine, abbreviated AEDG. Its molecular formula is C14H22N4O9 and the calculated mass is approximately 390.35 g/mol. The compound is made by solid-phase peptide synthesis rather than extracted from tissue, although early work described it as a short fragment of a peptide fraction obtained from bovine pineal extract. In the research literature the spelling epitalon and the variant epithalone both appear, while AEDG is the standard code used in peptide nomenclature.
== General process overview == In most industrial fermentations, the organisms or eukaryotic cells are submerged in a liquid medium; in others, such as the fermentation of cocoa beans, coffee cherries, and miso, fermentation takes place on the moist surface of the medium. There are also industrial considerations related to the fermentation process. For instance, to avoid biological process contamination, the fermentation medium, air, and equipment are sterilized. Foam control can be achieved by either mechanical foam destruction or chemical anti-foaming agents. Several other factors must be measured and controlled such as pressure, temperature, agitator shaft power, and viscosity. An important element for industrial fermentations is scale up. This is the conversion of a laboratory procedure to an industrial process. It is well established in the field of industrial microbiology that what works well at the laboratory scale may work poorly or not at all when first attempted at large scale. It is generally not possible to take fermentation conditions that have worked in the laboratory and blindly apply them to industrial scale equipment. Although many parameters have been tested for use as scale up criteria, there is no general formula because of the variation in fermentation processes. The most important methods are the maintenance of constant power consumption per unit of broth and the maintenance of constant volumetric transfer rate.
== Metabolism and derivatives == 14-Hydroxycaryophyllene oxide (C15H24O2) was isolated from the urine of rabbits treated with (−)-caryophyllene (C15H24). The X-ray crystal structure of 14-hydroxycaryophyllene (as its acetate derivative) has been reported. The metabolism of caryophyllene progresses through (−)-caryophyllene oxide (C15H24O) since the latter compound also afforded 14-hydroxycaryophyllene (C15H24O) as a metabolite.
=== Cardiac muscle === Cardiac muscle is the muscle of the heart. It is self-contracting, autonomically regulated and must continue to contract in a rhythmic fashion for the whole life of the organism. Hence it has special features.
=== Discrepant reports on natural agency === In 2013, researchers Michel de Waard (then at Université Joseph Fourier, Grenoble and Grenoble Institute of Neuroscience, La Tronche) reported in Angewandte Chemie that tramadol was found in relatively high concentrations (>1%) in the roots of the African pin cushion tree, Nauclea latifolia, concluding that it was a natural product in addition to its being a later human synthetic, and presenting a putative biosynthetic hypothesis for its origin. In 2014, Michael Spiteller (Technische Universität Dortmund) and collaborators reported results, also in Angewandte Chemie, that supported the conclusion that the presence of tramadol in those tree roots was the result of tramadol having been ingested by humans and having been administered to cattle (by farmers in the region); Spiteller et al. presented data that tramadol and its metabolites were present in animal excreta, which they then argue contaminated soil around the trees. They further observed that tramadol and its mammalian metabolites were found in tree roots in the far north of Cameroon where the commercial drug was in use, but not in the south where it was not being administered. In 2016, Spiteller and colleagues followed up their preceding work with a radiocarbon analysis that supported their contention that the tramadol found in N. latifolia roots was of human synthetic origin rather being plant-derived.
== Mechanism == The enzyme uses pyridoxal phosphate (PLP), the active form of vitamin B6, as a cofactor. PLP is essential to the mechanism of decarboxylation in AADC. In the active enzyme, PLP is bound to lysine-303 of AADC as a Schiff base. Upon substrate binding, Lys-303 is displaced by the substrate's amine. This positions the carboxylate of the substrate within the active site such that decarboxylation is favored. Decarboxylation of the substrate produces a quinonoid intermediate, which is subsequently protonated to produce a Schiff base adduct of PLP and the decarboxylated product. Lys-303 can then regenerate the original Schiff base, releasing the product while retaining PLP. Probing this PLP-catalyzed decarboxylation, it has been discovered that there is a difference in concentration and pH dependence between substrates. DOPA is optimally decarboxylated at pH 6.7 and a PLP concentration of 0.125 mM, while the conditions for optimal 5-HTP decarboxylation were found to be pH 8.3 and 0.3 mM PLP.
Sources: en.wikipedia.org
A DMA can separate charged aerosol particles or ions according to their mobility in an electric field prior to their detection, which can be done with several means, including electrometers or the more sophisticated mass spectrometers.
In common with many other developed countries, Canada is experiencing an increase in healthcare expenditures due to a demographic shift toward an older population, with more retirees and fewer people of working age. In 2021, the average age in Canada was 41.9 years. Life expectancy is 81.1 years. A 2016 report by the chief public health officer found that 88 percent of Canadians, one of the highest proportions of the population among G7 countries, indicated that they "had good or very good health". Eighty percent of Canadian adults self-report having at least one major risk factor for chronic disease: smoking, physical inactivity, unhealthy eating or excessive alcohol use. Canada has one of the highest rates of adult obesity among OECD countries, contributing to approximately 2.7 million cases of diabetes. Four chronic diseases—cancer (leading cause of death), cardiovascular diseases, respiratory diseases, and diabetes—account for 65 percent of deaths in Canada. There are approximately 8 million people aged 15 and older with one or more disabilities in Canada. In 2024, the Canadian Institute for Health Information estimated that healthcare spending reached $372 billion, or 12.4 percent of Canada's GDP for that year. In 2022, Canada's per-capita spending on health expenditures ranked 12th among health-care systems in the OECD. The Commonwealth Fund's 2021 report comparing the healthcare systems of the 11 most developed countries ranked Canada second-to-last.
Many psychoactive drugs can be or have been specifically designed for sublingual administration, including barbiturates, benzodiazepines, opioid analgesics with poor gastrointestinal bioavailability, LSD blotters, coca leaves, some hallucinogens. This route of administration is activated when chewing some forms of smokeless tobacco (e.g. dipping tobacco, snus). intrarectal ("plugging"): administering into the rectum, most water-soluble drugs can be used this way. smoking (see also the section below): tobacco, cannabis, opium, crystal meth, phencyclidine, crack cocaine, and heroin (diamorphine as freebase) known as chasing the dragon. transdermal patches with prescription drugs: e.g. methylphenidate (Daytrana) and fentanyl. Many drugs are taken through various routes. Intravenous route is the most efficient, but also one of the most dangerous. Nasal, rectal, inhalation and smoking are safer. The oral route is one of the safest and most comfortable, but for some drugs has poorer bioavailability.
In general, polystyrene is not accepted in curbside collection recycling programs and is not separated and recycled where it is accepted. In Germany, polystyrene is collected as a consequence of the packaging law (Verpackungsverordnung) that requires manufacturers to take responsibility for recycling or disposing of any packaging material they sell. Most polystyrene products are currently not recycled due to the lack of incentive to invest in the compactors and logistical systems required. Due to the low density of polystyrene foam, it is not economical to collect. However, if the waste material goes through an initial compaction process, the material changes density from typically 30 kg/m3 to 330 kg/m3 and becomes a recyclable commodity of high value for producers of recycled plastic pellets. Expanded polystyrene scrap can be easily added to products such as EPS insulation sheets and other EPS materials for construction applications; many manufacturers cannot obtain sufficient scrap because of collection issues. When it is not used to make more EPS, foam scrap can be turned into products such as clothes hangers, park benches, flower pots, toys, rulers, stapler bodies, seedling containers, picture frames, and architectural molding from recycled PS. As of 2016, around 100 tonnes of EPS are recycled every month in the UK. Recycled EPS is also used in many metal casting operations. Rastra is made from EPS that is combined with cement to be used as an insulating amendment in the making of concrete foundations and walls.
Sources: en.wikipedia.org
== Applications == Due to its contribution to fibrinolysis, tissue plasminogen activator is used medically to treat blood clot-related disorders including thrombotic or embolic stroke, myocardial infarction, and pulmonary embolism. It is manufactured using recombinant techniques and is sold as alteplase, reteplase, and tenecteplase. Alteplase was the first of these versions to go on the market, and has the same structure as tPA. Reteplase and tenecteplase both received FDA approval after alteplase, and have nonidentical structures to tPA. These recombinant forms of tPA have been shown to have a longer half-life in the blood and greater resistance to inhibition, resulting in an increased capacity to treat thrombolytic diseases. Urokinase is similarly used in the medical field, specifically for the treatment of pulmonary embolism.
In 2008, 2K Games confirmed that a PlayStation 3 version of the game was in development by 2K Marin. On July 3, 2008, 2K Games announced a partnership with Digital Extremes and said that the PlayStation 3 version is being developed by 2K Marin, 2K Boston, 2K Australia, and Digital Extremes. Jordan Thomas was the director for the PlayStation 3 version. While there were no graphical improvements to the game over the original Xbox 360 version, the PlayStation 3 version offered the widescreen option called "horizontal plus", introduced via a patch on the 360 version, while cutscene videos were of a much higher resolution than in the DVD version. Additional add-on content was also released exclusively for the PlayStation 3 version. One addition was "Survivor Mode", in which the enemies were made tougher, and Vita-Chambers provided less of a health boost when used, forcing the player to be more creative in approaching foes and to rely more on the less-used plasmids in the game. BioShock also supports Trophies and PlayStation Home. A demo version was released on the PlayStation Store on October 2, 2008. The game was released for PlayStation 3 on October 17, 2008, internationally and on October 21 in North America. An update for the PlayStation 3 version was released on November 13, 2008, to fix some graphical problems and occasions where users experienced a hang and were forced to reset the console. This update also incorporated the "Challenge Rooms" and "New Game Plus" features.
Morgan State began playing football in 1898, 31 years after the school was founded. The Bears have won three MEAC Championships (1976, 1979 and 2014). Their last Division I-AA/FCS playoffs appearance was in 2014. Fifty-three former Morgan players have gone on to play professional football. Former Morgan Bears Len Ford, Leroy Kelly, Willie Lanier and Rosey Brown are members of the Pro Football Hall of Fame in Canton, Ohio.
== Technology and product offerings == Seer's proteomics platform integrates engineered nanoparticles, automated sample preparation, and mass spectrometry. It utilizes nanoparticles with different physicochemical properties, including size, charge, and hydrophobicity, to separate and enrich proteins from biological samples, thereby addressing common issues related to dynamic range and sample complexity in proteomics. Seer's platform enables deep, unbiased proteomic analysis, allowing researchers to identify proteins associated with disease or therapeutic response without relying on prior assumptions. A 2020 study published in Nature Communications demonstrated that these nanoparticles form distinct protein coronas, enabling high-depth, parallel profiling of the plasma proteome. Independent benchmark studies indicate that nanoparticle-based plasma proteomics workflows significantly enhance proteome depth and improve quantitative precision when compared to traditional neat-plasma methods. These studies report approximately 3 to 6 times more protein identifications and about twice the reproducibility in independent side-by-side experiments. As of 2025, 58 papers have been published related to the Proteograph, including in journals such as Nature, Nature Communications, Nature Aging, and Cell Metabolism. Among these, a 2025 Nature Aging study reported the identification of more than 10,000 proteins, underscoring the Proteograph platform’s depth in studies at scale.
State and local programs are not permitted to participate. The failure to share data has caused foreign governments to refuse donations of expired medications. One exception occurred during the 2010 Swine Flu Epidemic when the FDA authorized expired Tamiflu based on SLEP Data. The SLEP discovered that drugs such as Cipro remained effective nine years after their shelf life, and, as a cost-saving measure, the US military routinely uses a wide range of SLEP tested products past their official shelf life if drugs have been stored properly.
Sources: en.wikipedia.org
The peptide contains four residues in the order alanine, glutamate, aspartate and glycine, abbreviated AEDG. The chain is linear and held together by three peptide bonds. Its calculated mass for the uncharged free form is about 390.3 daltons.
Epithalamin refers to a crude preparation derived from bovine pineal tissue, which contains many components. Epitalon is a single synthetic tetrapeptide identified from that material and produced by chemical synthesis. The two names are sometimes confused because early reports treated the synthetic peptide as an active fragment of the extract.
It has been registered for clinical use in Russia, where it is associated with a small family of short peptides. In most other jurisdictions it is not an approved medicine and is traded as a research chemical. Regulatory status varies by country and changes over time.
Epitalon is a synthetic tetrapeptide built from four amino acids: alanine, glutamate, aspartate, and glycine. It is not extracted from a natural source but made in the laboratory by chemical synthesis. Its short length makes it relatively straightforward to produce at high purity.