tetrapeptide is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Updated 2026-08-01. Numbers and descriptions here follow the published literature rather than marketing material.
The peptide is a synthetic analogue of epithalamin, a preparation extracted from bovine pineal glands. Investigators sought a short, chemically defined molecule that would reproduce some of the endocrine and gerontological observations attributed to the glandular extract. Proposed mechanisms centre on induction of telomerase activity, an effect reported in cultured human somatic cells in the early 2000s, together with influences on melatonin secretion and neuroendocrine regulation. Those mechanisms remain incompletely characterised, and the reported telomerase response has not been consistently reproduced by independent groups working in comparable systems.
Published work on this compound consists mainly of in vitro experiments, animal studies, and small clinical investigations, a substantial share of which appeared in Russian-language journals. Sample sizes are generally small, control conditions differ between studies, and several endpoints rely on markers whose clinical meaning is itself debated. Reviews of the longevity field treat the peptide as an early example of telomerase-directed research rather than an established intervention. Regulatory treatment varies by country: some jurisdictions place it under prescription controls, others treat it as a laboratory material, and importation may be restricted regardless of local status.
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.
Epitalon is a synthetic tetrapeptide whose sequence is alanine-glutamate-aspartate-glycine, written in single-letter code as AEDG. The four residues are joined by three peptide bonds, giving a linear backbone with no branching and no disulfide bridges. Its calculated molecular mass for the free form is approximately 390.3 daltons, a figure that rises when the compound is supplied as an acetate or trifluoroacetate salt. Because the chain is short, the molecule is defined entirely by its residue order rather than by any folded three-dimensional structure.
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.
| Property | Value | Notes |
|---|---|---|
| Peptide sequence | Ala-Glu-Asp-Gly | Often abbreviated AEDG in research literature |
| Common synonyms | Epithalon, epitalon, AEDG | Spelling variants refer to the same tetrapeptide |
| Molecular formula | C14H22N4O9 | Theoretical monoisotopic mass near 390.35 Da |
| Appearance | White to off-white powder | Typically supplied as a lyophilised solid |
| Solubility class | Freely soluble in water | Hydrophilic peptide; dissolves in aqueous buffer |
The Central Command adds it struck roughly 140 military targets in Iran after the attack. CENTCOM declares that the strait is "open to all vessels" and "Iran does not control" it. CENTCOM announces that it conducted additional strikes on dozens of Iranian targets over attacks against vessels to further degrade the regime's capability to attack civilian sailors and commercial ships in the strait. The US forces use suicide drone boats in combat for the first time to strike an Iranian submarine and ship maintenance facility at Bandar Abbas Naval Base. Mitch McConnell releases a statement amidst ongoing speculation about his health, stating he was hospitalized for pneumonia. July 13 2026 Iran war: Trump announces that the US will reinstate the "Iranian blockade in the Strait of Hormuz" and impose a 20% toll on cargo shipping through the strait. According to Trump, "The U.S.A. will be, from this point forward, known as 'THE GUARDIAN OF THE HORMUZ STRAIT.'" Trump describes it as a matter of fairness, claiming that the toll would cover "any and all costs necessary to do the job of providing safety and security to this very volatile section of the world." American-led Combined Maritime Forces' Joint Maritime Information Centre (JMIC) announces that the US naval blockade on Iran will start the following day. Trump formally informs the US Congress that the country has renewed hostilities against Iran. Trump declares that the US will hit Iran hard on that day and the next day, saying that the MoU was a test that the regime did not honor.
=== Perey's analysis === Eka-caesium was discovered on January 7, 1939, by Marguerite Perey of the Curie Institute in Paris, when she purified a sample of actinium-227 which had been reported to have a decay energy of 220 keV. Perey noticed decay particles with an energy level below 80 keV. Perey thought this decay activity might have been caused by a previously unidentified decay product, one which was separated during purification, but emerged again out of the pure actinium-227. Various tests eliminated the possibility of the unknown element being thorium, radium, lead, bismuth, or thallium. The new product exhibited chemical properties of an alkali metal (such as coprecipitating with caesium salts), which led Perey to believe that it was element 87, produced by the alpha decay of actinium-227. Perey then attempted to determine the proportion of beta decay to alpha decay in actinium-227. Her first test put the alpha branching at 0.6%, a figure which she later revised to 1%. Perey named the new isotope actinium-K (it is now referred to as francium-223) and in 1946, she proposed the name catium (Cm) for her newly discovered element, as she believed it to be the most electropositive cation of the elements. Irène Joliot-Curie, one of Perey's supervisors, opposed the name due to its connotation of cat rather than cation; furthermore, the symbol coincided with that which had since been assigned to curium. Perey then suggested francium, after France.
In July 2020, Lupin Pharmaceuticals pulled all lots (batches) of metformin after discovering unacceptably high levels of NDMA in tested samples. In August 2020, Bayshore Pharmaceuticals recalled two lots of tablets. The FDA issued revised guidelines about nitrosamine impurities in September 2024.
Yeast and other anaerobic microorganisms can convert the pyruvate produced from the oxidation of glucose by a glycolysis pathway to ethanol and CO2. In ethanol fermentation, one glucose molecule is converted into two ethanol molecules and two carbon dioxide (CO2) molecules. It is used to make bread dough rise: the carbon dioxide forms bubbles, expanding the dough into a foam. The ethanol is the intoxicating agent in alcoholic beverages such as wine, beer and liquor. Fermentation of feedstocks, including sugarcane, maize, and sugar beets, produces ethanol that is added to gasoline. In some species of fish, such as carp, it provides energy when oxygen is scarce (along with lactic acid fermentation). Before fermentation, a glucose molecule breaks down into two pyruvate molecules (glycolysis). The energy from this exothermic reaction is used to bind inorganic phosphates to ADP, which converts it to ATP, and convert NAD+ to NADH. The pyruvates break down into two acetaldehyde molecules and give off two carbon dioxide molecules as waste products. The acetaldehyde is reduced into ethanol using the energy and hydrogen from NADH, and the NADH is oxidized into NAD+ so that the cycle may repeat. The reaction is catalyzed by the enzymes pyruvate decarboxylase and alcohol dehydrogenase.
where S is the sorptivity of the medium, in units of m·s−1/2 or mm·min−1/2. This time dependence relation is similar to Washburn's equation for the wicking in capillaries and porous media. The quantity
Sources: en.wikipedia.org
=== Diagnostic === Intravenous injection of TRH has been used for diagnostic purposes in the context of the TRH test; administration of exogenous TRH can be used to determine whether hypothyroidism is of hypothalamic or hypophyseal etiology. However, this diagnostic approach has been superseded by ultrasensitive TSH assays and is nowadays only seldom employed.
Sixty-four countries initially joined; it was ratified and came into force in the US in 1967. The Convention on Psychotropic Substances of 1971 added synthetic, prescription and hallucinogenic drugs. The United Nations Convention Against Illicit Traffic in Narcotic Drugs and Psychotropic Substances of 1988 addressed international drug trafficking and "criminalized the entire drug market chain, from cultivation/production to shipment, sale, and possession." In 1968, President Lyndon B. Johnson (1963–69) decided that the government needed to make an effort to curtail the social unrest that blanketed the country at the time. He focused on illegal drug use, an approach that was in line with expert opinion on the subject at the time. In the 1960s, it was believed that at least half of the crime in the US was drug-related, and this estimate grew as high as 90% in the next decade. He created the Reorganization Plan of 1968 which merged the Bureau of Narcotics and the Bureau of Drug Abuse Control to form the Bureau of Narcotics and Dangerous Drugs within the Department of Justice.
=== Heterogeneous catalysis === Operando spectroscopy is widely applicable to heterogeneous catalysis, which is largely used in industrial chemistry. An example of operando methodology to monitor heterogeneous catalysis is the dehydrogenation of propane with molybdenum catalysts commonly used in industrial petroleum. Mo/SiO2 and Mo/Al2O2 were studied with an operando setup involving EPR/UV-Vis, NMR/UV-Vis, and Raman. The study examined the solid molybdenum catalyst in real time. It was determined that the molybdenum catalyst exhibited propane dehydrogenation activity, but deactivated over time. The spectroscopic data showed that the most likely catalytic active state was Mo4+ in the production of propene. The deactivation of the catalyst was determined to be the result of coke formation and the irreversible formation of MoO3 crystals, which were difficult to reduce back to Mo4+. The dehydrogenation of propane can also be achieved with chromium catalysts, through the reduction of Cr6+ to Cr3+. Propylene is one of the most important organic starting materials is used globally, particularly in the synthesis of various plastics. Therefore, the development of effective catalysts to produce propylene is of great interest. Operando spectroscopy is of great value to the further research and development of such catalysts.
Pawanexh Kohli is the founding Chief Executive of India's National Centre for Cold-chain Development (NCCD), the premier think-tank in agri-logistics set up in public-private-partnership mode in 2012, and from 2012 to 2020 was the Chief Advisor to Ministry of Agriculture & Farmers Welfare.
Sources: en.wikipedia.org
Epitalon is a synthetic four-amino-acid peptide with the sequence alanine–glutamate–aspartate–glycine, also written AEDG. It was developed in Russian gerontology research and is studied for proposed effects on telomerase, melatonin regulation, and neuroendocrine function. It is not an approved pharmaceutical in the United States or the European Union.
No. Epithalamin is a peptide-rich extract prepared from bovine pineal glands, while epitalon is a short synthetic peptide designed as a defined analogue of it. The synthetic version was intended to provide a reproducible molecule with some of the same proposed biological activity.
Telomere elongation and telomerase activation have been reported in cultured human somatic cells, but evidence from living human subjects is limited and has not been independently confirmed at scale. Reported findings come largely from small studies with differing designs, so the question remains open rather than settled.
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.