This is a working overview of lyophilised powder, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2025-11-03 and is reviewed periodically as new material appears.
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.
Verification of research-grade material involves comparing a supplier chromatogram against an in-house reference, checking the observed mass against the calculated value, and where possible confirming residue order by tandem mass spectrometry or enzymatic peptide mapping. Purity claims should be read alongside the method used to obtain them, because detection wavelength and integration settings alter the result. Batch-specific data, rather than a generic grade statement, is the informative part of a certificate.
Identity and purity of epitalon samples are normally established by reversed-phase high-performance liquid chromatography with ultraviolet detection near 214 nanometres, combined with mass spectrometry. The mass spectrum confirms the expected molecular ion and can reveal truncated or oxidised by-products. Amino acid analysis after acid hydrolysis verifies that the four residues are present in the expected ratio. Certificates typically report a purity figure taken from chromatographic peak area, expressed as a percentage of total integrated signal.
| 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 |
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.
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.
Identity is normally established by reversed-phase high-performance liquid chromatography combined with mass spectrometry, a pairing that separates components and confirms molecular mass at once. Purity is quoted as a percentage from the chromatogram, and figures above ninety-five percent are a frequent commercial specification. Amino acid analysis or sequencing supplies further confirmation when required. Because many short peptides behave similarly under chromatography, retention time alone does not establish sequence; the mass measurement is what separates one tetrapeptide from another, and certificates should report both.
Short peptides such as AEDG are normally supplied as a freeze-dried solid and are kept dry, cold, and shielded from light. Holding at minus twenty degrees Celsius is common for the long term, while a refrigerator suffices for brief periods before use. The material takes up moisture to some degree, so containers should stay sealed and be allowed to reach room temperature before opening, which limits condensation on the contents. Repeated warming and cooling of a single container is discouraged because it admits water and can lower the amount of intact peptide.
Published evidence comes mainly from Russian-language journals and from a single research group, with small sample sizes and limited independent replication. A few laboratories outside that group have examined related peptides and reported weaker or absent telomerase effects, so the central claim is best described as contested rather than settled. Rodent studies report modest changes in some ageing markers and in survival, but designs vary and control conditions are often sparse. No large randomised trial in humans has been published, and long-term safety data in healthy populations are correspondingly thin.
Epitalon is a synthetic tetrapeptide with the sequence alanine-glutamate-aspartate-glycine, commonly abbreviated AEDG. It was designed at the St. Petersburg Institute of Bioregulation and Gerontology as a short, chemically defined analogue of epithalamin, a fraction obtained from bovine pineal tissue. Small peptide bioregulators of this type formed a long-running line of work there from the 1980s onward. Because the molecule is produced by solid-phase synthesis rather than extraction, its composition is exact and its purity can be measured directly.
Solubility is high in water, phosphate-buffered saline and normal saline, a pattern that follows from the two acidic residues in the chain. The peptide dissolves poorly in non-polar solvents such as hexane or chloroform. Stock solutions are often prepared in water first and then diluted into the buffer of interest. Because the molecule is small and hydrophilic, filtration through a low-protein-binding membrane is usually straightforward, and visible particulates are uncommon in freshly made solutions.
Identity and purity are established with reversed-phase high-performance liquid chromatography and mass spectrometry. The chromatogram shows the main peak and any truncated or oxidised by-products, while the mass spectrum confirms the expected 390 dalton mass. Amino acid analysis can corroborate composition when a sample's origin is uncertain. Counterion content, particularly residual trifluoroacetate from purification, is frequently reported alongside purity because it shifts the net mass of the solid.
Reference material is normally supplied as a lyophilised powder in a sealed vial. Product literature typically recommends storage at minus twenty degrees Celsius or colder, protected from light and moisture. Freeze-thaw cycling is usually avoided because repeated condensation can introduce water into the vial. Working solutions are commonly prepared fresh, aliquoted, and kept cold for short periods rather than stored at ambient temperature. Labelling the date of opening helps track how long a vial has been in use.
Arsenal financed moves for Granit Xhaka and Shkodran Mustafi in mid-2016 for a combined £65 million, rendering the pair one of Arsenal's most expensive ever signings, as Wenger hoped to guide the club to their first league title win in over thirteen years the following season. Although Arsenal began strongly in the league, losing only once until December, back-to-back defeats to Everton and Manchester City resulted in Arsenal losing their stronghold on the league. Wenger also served a four-match touchline ban and had to pay a £25,000 fine after pushing referee Anthony Taylor during a win at home against Burnley. Further defeats to Chelsea and Liverpool all but rendered Arsenal out of the title race, and left qualification to the Champions League threatened by March. On 30 April, Arsenal lost to main rivals Tottenham which had confirmed the latter had finished above them in the Premier League for the first time since the 1994–95 FA Premier League season. The following month also saw them fail to finish in the top four since the 1996–97 FA Premier League season. On 27 May, Wenger became the most successful manager in the history of the FA Cup as Arsenal beat Premier League winners Chelsea 2–1 at Wembley through goals from Alexis Sánchez and Aaron Ramsey. The victory represented a further record for Wenger, as Arsenal too, became the most successful club in the competition's history as they won the competition for the 13th time. Four days following the win, Wenger signed a contract extension until 2019.
The Yugoslavia national football team represented Yugoslavia in international association football. Although the team mainly represented the pre-war Kingdom of Yugoslavia and the post-war SFR Yugoslavia, various iterations of the state were formally constituted in football, including the:
=== Requirements === The Food and Nutrition Board of the U.S. Institute of Medicine set Recommended Dietary Allowances (RDAs) for essential amino acids in 2002. For methionine combined with cysteine, for adults 19 years and older, 19 mg/kg body weight/day. This translates to about 1.33 grams per day for a 70 kilogram individual.
=== Solubility === Legumin proteins are insoluble in water because of their hydrophobic units. Legumins are soluble in very weak acids and alkalies. This protein is not coagulated by heat. Due to their important storage function legumin proteins and another important storage protein vicilin have been found be to the most abundant water and alkali soluble proteins within cottonseed.
While a member of Congress, Sanders sponsored 15 concurrent resolutions and 15 Senate resolutions. Of those he co-sponsored, 218 became law. While he has consistently advocated for progressive causes, Politico wrote that he has "rarely forged actual legislation or left a significant imprint on it". According to The New York Times, "Big legislation largely eludes Mr. Sanders because his ideas are usually far to the left of the majority of the Senate ... Mr. Sanders has largely found ways to press his agenda through appending small provisions to the larger bills of others." During his time in the Senate, he had lower legislative effectiveness than the average senator, as measured by the number of sponsored bills that passed and successful amendments made. Nevertheless, he has sponsored over 500 amendments to bills, many of which became law. The results of these amendments include a ban on imported goods made by child labor; $100 million in funding for community health centers; $10 million for an outreach program for servicemembers who have post-traumatic stress disorder, traumatic brain injury, depression, panic attacks, and other mental disorders; a public database of senior Department of Defense officials seeking employment with defense contractors; and including autism treatment under the military healthcare program Tricare. In August 2022, Sanders voted for the Inflation Reduction Act of 2022. He was not satisfied with the bill, calling it only a small step forward.
Sources: en.wikipedia.org
Main dishes are usually centred on a sauce or stew of simsim, groundnuts, beans or meat. The starch traditionally comes from posho (maize meal) or matooke (steamed and mashed green banana) in the central or kalo (an ugali dish made from millet) in the north, east and west. Posho or millet is cooked as a porridge for breakfast. For main meals, white maize flour is added to the saucepan and stirred into the posho until the consistency is firm. It is then turned out onto a serving plate and cut into individual slices (or served onto individual plates in the kitchen). Cassava, yam, and African sweet potato are also eaten; the more affluent include white (often called "Irish" or "Western"/mazungu) potato and rice in their diets. Soybeans were promoted as a healthy food staple in the 1970s and this is also occasionally eaten for breakfast, although mostly used as feed for animals. Chapati, similar to Asian flatbreads, are also part of Ugandan cuisine.
Prevalence of hepatocellular carcinoma in individuals exposed to aflatoxin increases with co-infection of hepatitis B virus. One study estimated that while individuals with urinary aflatoxin bio-markers were at a threefold greater risk than the normal population for hepatocellular carcinoma; those infected with hepatitis B virus were at a fourfold risk; and those with the aflatoxin bio-markers and infected with hepatitis B virus were at a 60 times greater risk for hepatocellular carcinoma than the normal population.
2-Amino-3-carboxymuconic semialdehyde is an intermediate in the metabolism of tryptophan in the kynurenine pathway. Quinolinic acid is a neurotoxin formed nonenzymatically from 2-amino-3-carboxymuconic semialdehyde in mammalian tissues. 2-Amino-3-carboxymuconic semialdehyde is enzymatically converted to picolinic acid via 2-aminomuconic semialdehyde.
By 9 April 2026, there was no sign that the agreement to lift the Iranian blockade of Strait of Hormuz was being implemented, ships once again being prevented from moving through the Strait, and Israel and the United States being accused by Iran of violating the ceasefire with the recent attacks in Lebanon. However, no new attacks were reported in the Gulf that day either. Indian media sources reported that the Pakistan Air Force had mobilised its JF-17 and F-16 fighters, as well as IL-78 tankers and C-130 cargo planes. The fighters are expected to fly an escort mission for the Iranian representatives and the PAF set up a protective shield over Iran and the Persian Gulf for the Iranian delegation to travel to Islamabad. Iranian aircraft were also escorted by AEWACS, JF-17s and J-10C aircraft and flew with their transponders switched off. According to one report, Iran lost track of mines it planted in the Strait of Hormuz, and it was therefore unable to fully open the Strait. The US began a naval operation to clear the Strait from mines.
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 usual approach is reversed-phase HPLC with ultraviolet detection, reported as a percentage of total peak area. Mass spectrometry is used alongside chromatography to confirm identity rather than purity alone.