The short version of AEDG fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2025-12-12 and is reviewed periodically as new material appears.
Regulatory treatment differs by country. No formulation of epitalon holds a marketing authorisation as a medicine in the United States or the European Union, where material sold for laboratory use is handled as a research chemical and is not intended for human consumption. In Russia, several short peptide preparations from the same institute's peptide series are registered medicinal products, and epitalon appears in that national context. Elsewhere it is frequently offered as a cosmetic ingredient, a category with lighter requirements. Advertising claims about longevity or disease prevention are restricted in most jurisdictions, which limits how sellers describe the compound.
Freeze-dried epitalon is normally kept at minus twenty degrees Celsius in a sealed, desiccated container, protected from light. Short excursions at ambient temperature during shipping are generally tolerated, but repeated warming and cooling cycles encourage moisture uptake, which shortens shelf life. Once dissolved, the peptide is far less stable than the solid: aqueous solutions are subject to hydrolysis and to deamidation at the aspartate and glutamate residues. Working solutions are therefore held refrigerated and used within days, and repeated freezing and thawing of the same vial is best avoided.
Identity and purity are checked by reversed-phase high-performance liquid chromatography, usually with ultraviolet detection near 214 nanometres, where the peptide bond absorbs. Mass spectrometry confirms the expected mass and reveals whether truncation products or adducts are present. Acid hydrolysis followed by amino acid analysis gives the residue ratio, which should approximate one alanine, one glutamate, one aspartate and one glycine. Counter-ions such as acetate or trifluoroacetate remain in the dried product and lower net peptide content, so a stated purity figure on a label does not by itself describe how much peptide a vial holds.
Residue composition is the property that most cleanly separates verified material from mislabelled samples. Alanine, glutamate, aspartate and glycine appear in that order from the N-terminus, and the two acidic residues sit in the middle of the chain. Because the peptide is short, it can be produced by solid-phase synthesis and characterised by mass spectrometry without ambiguity. Any reported sample whose measured mass departs substantially from 390 daltons is a different compound or a degraded mixture rather than epitalon.
Epitalon is a synthetic tetrapeptide whose four residues are alanine, glutamate, aspartate and glycine, commonly abbreviated AEDG. Its molecular formula is C14H22N4O9 and its monoisotopic mass is near 390.35 daltons. The peptide carries two acidic side chains, so it is neutral to negatively charged in most aqueous buffers. Published reference summaries usually list it under both spellings, epitalon and epithalon, and treat the two names as the same material.
| Property | Value | Notes |
|---|---|---|
| Storage temperature, solid | Approximately -20 C | Sealed, desiccated, protected from light |
| Typical identity method | Electrospray mass spectrometry | Protonated ion expected near 391 |
| Typical purity method | Reversed-phase HPLC | Ultraviolet detection near 214 nm |
| Common synonyms | Epithalon, epithalone, AEDG | Spelling variants appear in supplier catalogues |
| Solution stability | Days at 2-8 C | Hydrolysis and deamidation limit shelf life |
Because epitalon has no pharmacopoeial monograph, quality assessment depends on supplier documentation and independent testing. Certificates of analysis typically report a purity figure from a single chromatographic run, a measured mass and sometimes an appearance description, but methods and acceptance criteria are not harmonised across vendors. Third-party laboratories can repeat identity and purity measurements, and mismatches between labelled and measured peptide content have been described for research peptides generally. What constitutes adequate identity confirmation for a molecule of this size stays an open question, since mass agreement alone does not separate closely related sequences.
Identity testing for epitalon relies on reversed-phase high-performance liquid chromatography for purity and mass spectrometry for mass confirmation. Because the sequence contains no tryptophan or tyrosine, ultraviolet detection at 280 nanometres is insensitive, so chromatographic methods usually monitor absorbance near 214 nanometres, where the peptide backbone absorbs. Electrospray ionisation or matrix-assisted laser desorption/ionisation then checks the intact mass against the expected value near 390 daltons. Peptide mapping or amino acid analysis after acid hydrolysis can supplement these measurements, although such confirmatory work is seldom reported on commercial certificates of analysis.
Stability of the tetrapeptide follows ordinary peptide chemistry rather than any unusual structural feature. The aspartate-glycine pair is prone to aspartimide formation under mildly basic or neutral conditions, and deamidation can follow, altering both mass and chromatographic retention. Dry lyophilised powder kept at or below minus twenty degrees Celsius is the usual handling recommendation, with repeated freeze-thaw cycles avoided. Once dissolved in neutral aqueous buffer, degradation proceeds over days to weeks depending on pH and temperature, while acidic conditions generally slow the aspartimide route. A formal stability-indicating study has not been published in the indexed literature.
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.
Epitalon is a synthetic tetrapeptide whose sequence is alanine–glutamate–aspartate–glycine, commonly abbreviated AEDG. It was developed in Russia during the 1980s and 1990s by investigators associated with the St. Petersburg Institute of Bioregulation and Gerontology, who studied short peptides as regulators of gene expression and tissue function. The alternative spelling epithalon appears interchangeably in the literature, and the two names refer to the same molecule. Outside Russia it is encountered chiefly as a research chemical rather than a licensed medicine, and it holds no approval from the United States Food and Drug Administration or the European Medicines Agency.
It has little arable land and few natural resources, importing most of its food and raw materials. More than 90% of Hong Kong's food is imported, including nearly all of its meat and rice. Agricultural activity is 0.1% of GDP and consists of growing premium food and flower varieties. Although the territory had one of Asia's largest manufacturing economies during the latter half of the colonial era, Hong Kong's economy is now dominated by the service sector. The sector generates 92.7% of economic output, with the public sector accounting for about 10%. Between 1961 and 1997, Hong Kong's gross domestic product increased by a factor of 180, and per capita GDP increased by a factor of 87. The territory's GDP relative to mainland China's peaked at 27% in 1993; it fell to less than 3% in 2017, as the mainland developed and liberalised its economy. Economic and infrastructure integration with China has increased significantly since the 1978 start of the reform and opening up on the mainland. Since resumption of cross-boundary train service in 1979, many rail and road links have been improved and constructed, facilitating trade between regions. The Closer Economic Partnership Arrangement formalised a policy of free trade between the two areas, with each jurisdiction pledging to remove remaining obstacles to trade and cross-boundary investment. A similar economic partnership with Macau details the liberalisation of trade between the special administrative regions. Chinese companies have expanded their economic presence in the territory since the handover.
=== Medicinal === In traditional Chinese medicine, the entirety of S. affinis is used as an agent to treat colds and pneumonia. In addition, root extract of S. affinis has shown antimicrobial activity. Furthermore, Baek et al. observed antioxidant activity in 2004. Also in 2004 inhibitory effects on acetylcholine esterase, monoamine oxidase and xanthine oxidase activities were observed in rat brains after 20 days of feeding with methanolic extracts of S. affinis. Ethanol extract from this plant also seems to have antitumour activity.
== Personal life == Helton came up as a major fan of Chicago Cubs' first baseman Mark Grace, himself a left-handed first baseman who was both a highly successful hitter and also excelled with the glove. Grace was nearing retirment as a player when Helton reached the major leagues. Helton took jersey number 17 as a tribute to Grace, and wore that uniform number for the rest of his career. Helton, his wife, and their two daughters reside in Knoxville, Tennessee. They previously lived in Brighton, Colorado, but sold their house in 2018. Helton and his family are good friends with Helton's former Tennessee Volunteers football teammate, Hall of Fame quarterback Peyton Manning. In 2013, Helton was arrested in Colorado for driving under the influence (DUI) of alcohol. He was fined $400, received a year of probation, and was ordered to perform 24 hours of community service. In 2019, Helton was cited for another DUI after crashing his car in Tennessee. He subsequently entered a treatment program. He was sentenced to two days in jail in 2020 after pleading guilty to the DUI.
The Centre Party (German: Zentrum, Z), officially the German Centre Party (German: Deutsche Zentrumspartei, DZP) and also known in English as the Catholic Centre Party, is a Christian democratic political party in Germany. It was most influential in the German Empire and Weimar Republic. Formed in 1870, it successfully battled the Kulturkampf waged by Chancellor Otto von Bismarck against the Catholic Church. It soon won a quarter of the seats in the Reichstag, and its middle position on most issues allowed it to play a decisive role in the formation of majorities. The party name Zentrum (Centre) originally came from the fact that Catholic representatives would take up the middle section of seats in parliament between the social democrats and the conservatives. For most of the Weimar Republic, the Centre Party was the third-largest party in the Reichstag and a bulwark of the Republic, participating in all governments until 1932. Following Adolf Hitler's rise to power in early 1933, the Centre Party was among the parties who voted for the Enabling Act, which granted legislative powers to Hitler's government. Nevertheless, the party was pressured into dissolving itself on 5 July, as the Nazi Party became the only legally permitted party in the country shortly thereafter. After World War II, the party was reconstituted, but could not rise again to its former importance, as most of its members joined the new interdenominational Christian Democratic Union (CDU) and, in Bavaria, the Christian Social Union (CSU).
=== Plasma synthesis === Plasma synthesis has evolved to be one of the most popular gas-phase approaches for the production of quantum dots, especially those with covalent bonds. For example, silicon and germanium quantum dots have been synthesized by using nonthermal plasma. The size, shape, surface and composition of quantum dots can all be controlled in nonthermal plasma. Doping that seems quite challenging for quantum dots has also been realized in plasma synthesis. Quantum dots synthesized by plasma are usually in the form of powder, for which surface modification may be carried out. This can lead to excellent dispersion of quantum dots in either organic solvents or water (i. e., colloidal quantum dots).
Sources: en.wikipedia.org
Franz Josef Land in the Russian Arctic was named in his honour in 1873 by the Austro-Hungarian North Pole expedition which first reported finding it. The Franz Josef Glacier in New Zealand's South Island also bears his name. Franz Joseph founded in 1872 the Franz Joseph University (Hungarian: Ferenc József Tudományegyetem, Romanian: Universitatea Francisc Iosif) in the city of Cluj-Napoca (at that time a part of Austria-Hungary under the name of Kolozsvár). The university was moved to Szeged after Cluj became a part of Romania, becoming the University of Szeged. In certain areas, celebrations are still being held in remembrance of Franz Joseph's birthday. The Mitteleuropean People's Festival takes place every year around 18 August, and is a "spontaneous, traditional and brotherly meeting among peoples of the Central-European Countries". The event includes ceremonies, meetings, music, songs, dances, wine and food tasting, and traditional costumes and folklore from Mitteleuropa. Franz Joseph was for some time present on the Polish Żywiec Zdrój bottled water labels, before being eventually removed in favor of the Abrahamów ridge.
TrkC (pronounced "Track C"), is apparently the "physiologic" receptor, in that it binds with greatest affinity to NT-3. However, NT-3 is capable of binding and signaling through a TrkC-related receptors called TrkB. Finally, NT-3 also binds a second-receptor type besides Trk receptors, called the LNGFR (for "low affinity nerve growth factor receptor).
From the sophistication of full fentanyl synthesis and acute toxicity in laboratory environments, 'clandestine' labs in Mexico prefer to make an illicit dosage form from available fentanyl rather than the synthesis itself. Based on further research by investigators, fentanyl and analogues are likely synthesized in labs that have the appearance of a legal entity, or are diverted from pharmaceutical laboratories. Investigations and convictions of members of the Sinaloa drug cartel by federal agencies made a clear connection between illegal arms trafficking from the U.S. to Mexico and the smuggling of fentanyl into the U.S. Mexico had repeatedly made official complaints, since illegal guns are easily purchased (for example in Arizona and as far north as Wisconsin and even Alaska) according to U.S. intelligence sources. The guns are transported onto Mexican territory through a chain of American brokers and couriers, often financed by those drug cartels that also engage in money laundering. Therefore, the lack of arms controls in the U.S. has directly contributed to the U.S. opioid overdose crisis. The opioid epidemic in the United States is largely fueled by drugs smuggled from Mexico; approximately 98% of fentanyl entering the U.S. comes from Mexico. In January 2025, President Trump said that tariffs on Mexico were intended to reduce the U.S. trade deficit and force the country to secure its border with the U.S. against fentanyl smuggling and illegal immigration.
=== Protein-protein interactions === O-GlcNAcylation of a protein can alter its interactome. As O-GlcNAc is highly hydrophilic, its presence may disrupt hydrophobic protein-protein interactions. For example, O-GlcNAc disrupts Sp1 interaction with TAFII110, and O-GlcNAc disrupts CREB interaction with TAFII130 and CRTC. Some studies have also identified instances where protein-protein interactions are induced by O-GlcNAc. Metabolic labeling with the diazirine-containing O-GlcNDAz has been applied to identify protein-protein interactions induced by O-GlcNAc. Using a bait glycopeptide based roughly on a consensus sequence for O-GlcNAc, α-enolase, EBP1, and 14-3-3 were identified as potential O-GlcNAc readers. X-ray crystallography showed that 14-3-3 recognized O-GlcNAc through an amphipathic groove that also binds phosphorylated ligands. Hsp70 has also been proposed to act as a lectin to recognize O-GlcNAc. It has been suggested that O-GlcNAc plays a role in the interaction of α-catenin and β-catenin.
== Side effects == Side effects of fentanyl analogs are similar to those of fentanyl itself, which include itching, nausea and potentially serious respiratory depression, which can be life-threatening. Fentanyl analogs have killed hundreds of people throughout Europe and the former Soviet republics since the most recent resurgence in use began in Estonia in the early 2000s, and novel derivatives continue to appear.
Sources: en.wikipedia.org
The solid is kept cold, dry and dark, typically at minus twenty degrees Celsius, in a sealed container with desiccant. Dissolved material is kept refrigerated and used promptly. Freezing and thawing a solution repeatedly is avoided because it accelerates degradation.
Reversed-phase chromatography with ultraviolet detection gives a purity percentage, while mass spectrometry confirms identity. Amino acid analysis checks the residue composition. Buyers typically request a certificate of analysis showing these measurements for the specific lot.
It is not authorised as a medicine in the United States or the European Union. Material is sold there as a research chemical or cosmetic ingredient. Some related short peptides are registered drugs in Russia, which is a distinct national situation rather than a general approval.
It is a four-amino-acid peptide built from alanine, glutamate, aspartate and glycine in that order. Its formula is C14H22N4O9, and it is made by chemical synthesis rather than extracted from tissue. The synthetic peptide is a single defined molecule, unlike the pineal extracts it is often compared with.