AEDG 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.
Last reviewed on 2026-07-25. Where a claim depends on a specific study, the study is described rather than over-claimed.
Documentation accompanying research peptides usually includes a certificate of analysis listing the batch number, purity figure, and test methods applied. Buyers comparing suppliers should check whether the reported purity refers to chromatographic area or to a mass-balance calculation, because the two are not equivalent. Counter-ion content, residual solvents, and water content are sometimes omitted from such certificates even though they affect the actual peptide mass present. Independent verification through a second laboratory is the most direct way to confirm that a supplied material matches its label.
Purity assessment of peptide reagents normally relies on reversed-phase high-performance liquid chromatography. A gradient of acetonitrile in water with trifluoroacetic acid, paired with a C18 stationary phase, separates the target tetrapeptide from truncated sequences and deletion analogues. Detection at 214 nanometres exploits absorbance of the peptide backbone, since the molecule contains no aromatic residue. Results are expressed as a percentage of total peak area. Values above ninety-five percent are typical for research-grade material, although reporting conventions vary between suppliers.
The parent extract epithalamin was characterised as a low-molecular-weight fraction of pineal tissue rather than a single defined chemical entity. Researchers fractionated it and tested successive fragments for activity, a screening approach typical of peptide discovery work in that era. Epitalon emerged from that process as one of the shorter sequences of interest. Because the original extract was never fully resolved into individual components, claims about which constituent drives a given effect rest on inference. This distinction matters when reading older reports that attribute extract observations to the tetrapeptide itself.
Epitalon is a synthetic tetrapeptide with the residue sequence alanine-glutamate-aspartate-glycine, commonly abbreviated AEDG. Its monoisotopic mass is approximately 390.35 daltons, and it is usually supplied as a lyophilised trifluoroacetate or acetate salt. The compound was derived from a pineal gland extract called epithalamin, a heterogeneous preparation investigated in the former Soviet Union. Researchers associated with the Saint Petersburg Institute of Bioregulation and Gerontology described the tetrapeptide as a constituent fragment of that extract. Commercial material is offered as a laboratory reagent rather than as a finished pharmaceutical product.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white powder | Freeze-dried solid |
| Solubility class | Freely soluble in water | Aqueous buffers also suitable |
| Typical storage temperature | Minus 20 degrees Celsius or colder | Desiccated and light protected |
| Typical analytical method | RP-HPLC with UV detection | 214 nm on C18 column |
| Identity confirmation | Electrospray mass spectrometry | Sequence verified separately |
No pharmacopoeial monograph exists for this peptide, so quality rests on the supplier's internal specifications and on whatever independent testing a purchaser arranges. Certificates of analysis differ widely in which tests they report and in the limits applied. The counter-ion introduced during purification, commonly acetate or trifluoroacetate, changes the net peptide content of a given mass of powder, so two samples of equal weight may not contain equal amounts of the active sequence. Third-party laboratories can verify purity, identity, residual solvents, and counter-ion content for a fee, which makes documentation more informative than labelling.
Verification of a sample usually begins with reversed-phase high-performance liquid chromatography, which resolves the peptide from truncated sequences and other impurities and expresses purity as a percentage of total peak area. Mass spectrometry by electrospray ionisation or matrix-assisted laser desorption supplies an independent check, because the measured mass can be compared against the theoretical value for AEDG. Amino acid analysis or tandem mass spectrometry sequencing can confirm residue order. Each of these methods answers a different question: a purity figure does not establish identity, and an identity match does not establish how much of the material is intact peptide.
The molecule is a short, linear, hydrophilic peptide that dissolves readily in water or aqueous buffer. Its principal chemical liabilities are hydrolytic rather than oxidative, since it contains no cysteine, methionine, or tryptophan residues. The aspartate–glycine step is a recognised site for aspartimide formation under mildly acidic or basic conditions, generating isoaspartate and succinimide-related products over time. Desiccated lyophilised powder held at −20 °C is comparatively stable, whereas dilute solutions degrade faster and are best frozen as single-use aliquots rather than thawed repeatedly.
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.
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.
Human data are limited to small studies, often without the randomization, blinding, or control groups expected in contemporary clinical research. Reported outcomes have included changes in melatonin levels, immune markers, and subjective measures, but sample sizes were generally too small to support firm conclusions. Some reviews treat the peptide as promising while noting methodological weaknesses; others question whether the observed effects are specific. The compound is frequently discussed in longevity-focused communities, where enthusiasm often outpaces the published evidence. Separating established findings from speculation is therefore important when reading summaries of this research.
Epitalon emerged from research conducted in Saint Petersburg by Vladimir Khavinson and colleagues, who studied short peptides as potential regulators of aging. The work built on epithalamin, a pineal gland extract reported to influence neuroendocrine function. Epitalon was designed as a synthetic counterpart with a defined sequence, allowing reproducible experiments that extracts could not support. Early publications described effects on melatonin rhythms and lifespan in animal models. These findings circulated mainly in Russian-language journals during the 1990s, which limited their visibility among English-speaking researchers.
The most widely cited claim is that epitalon activates telomerase and thereby extends telomere length. Supporting evidence comes largely from cultured human cells, where treatment was associated with increased telomerase activity and delayed replicative senescence. Telomerase activation is a biologically consequential effect, since the enzyme is largely silenced in most somatic cells. However, the route by which a short peptide would reach and act on the enzyme's regulatory machinery has not been established. Independent replication in human trials is scarce, so the link between cell-culture observations and whole-body aging remains an open question.
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.
== Pharmacogenomics == There is increasing evidence in support of genetics being a key factor in the development of OIH through its influence on both pain sensitivity and analgesic control. Current evidence indicates that the genetic influence stems from polymorphisms of the gene coding for the enzyme, catechol-O-methyltransferase (COMT). Its enzymatic activity varies depending on its three possible genotypes, which are seen as a single amino acid change from valine to methionine, resulting in significant variability in its activity. Degradation of the neurotransmitters, dopamine and noradrenaline, is approximately 4-fold greater when the amino acid presented is valine instead of methionine. This results in modulation of the dopaminergic and noradrenergic response at the synaptic level of neurons, which has been linked to having effects on memory function, anxiety, and pain sensitivity in comparison to individuals presenting as homozygous for valine alleles of this particular gene (COMTval158). A number of opioids undergo metabolism by cytochrome P450 enzymes in order to generate active metabolites. Only by generating these active metabolites can analgesic effects occur. The enzyme CYP2D6 is used to metabolize several opioids including codeine, methadone, hydrocodone, and tramadol. The level of expression of CYP2D6 can vary dramatically between different individuals. Individuals with low expression of CYP2D6 are designated as poor metabolizers while individuals with high expression of CYP2D6 are designated as fast metabolizers.
includes measurements of radioactivity in plasma, including metabolite correction. From the two-tissue compartment model and by assuming there is only passive diffusion across the blood brain barrier, one obtains:
=== Harm and litigation === A similar drug, aminorex, had caused severe lung damage and "provided reason to worry that similar drugs ... could increase the risk of a rare but often fatal lung disease, pulmonary hypertension." In 1994, Wyeth official Fred Wilson expressed concerns about fenfluramine's labeling containing only four cases of pulmonary hypertension when a total of 41 had been observed, but no action was taken until 1996. In 1995, Wyeth introduced dexfenfluramine (the dextro isomer, marketed as Redux), which it hoped would cause fewer adverse effects. However, the medical officer of the Food and Drug Administration (FDA), Leo Lutwak, insisted upon a black box warning of pulmonary hypertension risks. After Lutwak refused to approve the drug, the FDA management had James Milton Bilstad, FDA Senior Drug Evaluator, sign it and approve the drug with no black box warning for marketing in 1996. European regulators required a major warning of pulmonary hypertension risks. In 1996, a 30-year-old woman developed heart problems after a month of using fenfluramine/phentermine; when she died in February 1997, the Boston Herald devoted a front-page article to her. In August 1997, a paper in the New England Journal of Medicine (NEJM) from the Mayo Clinic discussed clinical findings in 24 people who had taken fen-phen. The authors noted that their findings suggested a possible correlation between mitral valve dysfunction and the use of these anorectic agents.
==== Bedding ==== Silver is widely studied for its antimicrobial properties, particularly its ability to inhibit microbial growth and reduce odor formation in textiles. It is also used in some textile applications for its thermal conductivity. Bed sheets, bed pillows, comforters, and other bedding products infused with ions are marketed for their antimicrobial and antifungal additives.
==== Soviet secrecy and obfuscation ==== On August 30, 1955, Sergei Korolev succeeded in convincing the Soviet Academy of Sciences to establish a commission dedicated to achieving the goal of launching a satellite into Earth orbit before the United States, this can be viewed as the de facto start date of the space race. The Council of Ministers of the Soviet Union began a policy of treating development of its space program as top-secret. When the Sputnik project was first approved, one of the immediate courses of action the Politburo took was to consider what to announce to the world regarding their event. The Telegraph Agency of the Soviet Union (TASS) established precedents for all official announcements on the Soviet space program. The information eventually released did not offer details on who built and launched the satellite or why it was launched. The Soviet space program's use of secrecy served as both a tool to prevent the leaking of classified information between countries, and to avoid revealing specifics to the Soviet populace in regards to their short and long term goals; the program's nature embodied ambiguous messages concerning its goals, successes, and values. Launches were not announced until they took place, cosmonaut names were not released until they flew, and outside observers did not know the size or shape of their rockets or cabins of most of their spaceships, except for the first Sputniks, lunar probes, and Venus probe.
Sources: en.wikipedia.org
The combination of aerobic activity and cryotherapy may be an innovative therapeutic strategy to improve the aerobic capacity in arthritis patients and consequently reduce their cardiovascular risk while minimizing pain and disease activity. Emerging rehabilitation strategies have also highlighted the benefits of low-intensity resistance training combined with blood flow restriction for individuals with rheumatoid arthritis. This rehabilitation approach allows patients to improve muscle strength, muscle hypertrophy, and functional performance while placing less mechanical stress on the affected joints, making it ideal for individuals experiencing pain, joint instability, or reduced tolerance to resistance exercise. Incorporating blood flow restriction training into physical therapy programs may be beneficial in supporting the maintenance of muscle function and independence in activities of daily living and is evidence based.
== Typical design == The catalyst traditionally consists of a 2% coating of Ni in the form of nickel nitrate deposited on a chromatographic packing material. A 1½" long bed is packed around the bend of an 8"×1/8" SS U-tube. The tube is clamped in a block so that the ends protrude down into the column oven for connection between column or TCD outlet and FID base. Heat is provided by a pair of cartridge heaters and controlled by a temperature controller. Hydrogen for the reduction can be provided either by adding it via a tee at the inlet to the catalyst (preferred), or by using hydrogen as carrier gas.
== Historical background == For almost 50 years molecular biology was based on two dogmas: (i) equating biological function of the protein with a unique three-dimensional structure and (ii) assuming exquisite specificity in protein complexes. Specificity/selectivity is ensured by unambiguous set of interactions formed between the protein and its ligand (another protein, DNA, RNA or small molecule). Many protein complexes however, contain functionally important/critical regions, which remain highly dynamic in the complex or adopt different conformations. This phenomenon is defined fuzziness. The most pertinent example is the cyclin-dependent kinase inhibitor Sic1, which binds to the SCF subunit of Cdc4 in a phosphorylation dependent manner. No regular secondary structures are gained upon phosphorylation and the different phosphorylation sites interchange in the complex.
A crystal structure of the serotonin 5-HT2B receptor bound to LSD reveals an extracellular loop that forms a "lid" over the diethylamide end of the binding cavity and "traps" LSD in the binding pocket, which explains the slow rate of LSD unbinding from serotonin receptors. The related lysergamide lysergic acid amide (LSA) that lacks the diethylamide moiety is far less potent in comparison. Moreover, a specific residue in the binding pocket is partially responsible for the prolonged action of LSD, and this residue is found in the human protein but not in the receptors of rodents. LSD is an extraordinarily potent psychoactive drug and is among the most potent psychedelics known in humans. The very high potency of LSD in producing psychedelic-like effects is also the case in animals, including rodents and monkeys. It is unclear why LSD is so potent. The affinity and activational potency of LSD at the human serotonin 5-HT2A receptor in vitro is unremarkable compared to other psychedelics such as DOI and DOB. There is no evidence for its greater potency being related to pharmacokinetics or metabolism. It appears that the N,N-diethylamide moiety of LSD fits into a sterically constrained region of the serotonin 5-HT2A receptor that specifically accommodates this moiety. LSD, like other psychedelics, has been found to increase the expression of genes related to synaptic plasticity and hence to have psychoplastogenic effects. This appears to be mediated by serotonin 5-HT2A receptor agonism.
The isotopic substitution changes the vibrational frequencies of various bonds in the molecule, which can have observable effects on the chemical reactivity via the kinetic isotope effect, and even by extension the biological activity in some cases.
Sources: en.wikipedia.org
=== Benefits === Surveys within the European Union projects "Freshlabel" and "Chill-on" have shown positive feedback from consumers on the use of TTIs on food products. As TTIs help assure the cold chain of food products, they are expected to reduce the amount of food waste, as well as reducing the number of foodborne illnesses.
Many Indian species have descended from those of Gondwana, the southern supercontinent from which India separated more than 100 million years ago. India's subsequent collision with Eurasia set off a mass exchange of species. However, volcanism and climatic changes later caused the extinction of many endemic Indian forms. Still later, mammals entered India from Asia through two zoogeographic passes flanking the Himalayas. This lowered endemism among India's mammals, which stands at 12.6%, contrasting with 45.8% among reptiles and 55.8% among amphibians. Among endemics are the vulnerable hooded leaf monkey and the threatened Beddome's toad of the Western Ghats. According to the IUCN Red List, India contains 1,021 threatened animal species—99 mammal, 82 bird, 105 reptile, 139 amphibian, 332 fish, 10 mollusk, and 254 other invertebrate—727 threatened plant species, and 4 threatened fungi species. Among them are the endangered Bengal tiger and the Ganges river dolphin. Critically endangered species include the gharial, a crocodilian; the great Indian bustard; and the Indian white-rumped vulture, which has become nearly extinct by having ingested the carrion of diclofenac-treated cattle. Before they were extensively used for agriculture and cleared for human settlement, the thorn forests of Punjab were mingled at intervals with open grasslands that were grazed by large herds of blackbuck preyed on by the Asiatic cheetah; the blackbuck, no longer extant in Punjab, is now severely endangered in India, and the cheetah is extinct.
== Technology == OpenELIS is web-based, with a Java/Spring backend and a React front end, and is deployed using Docker-based containerised infrastructure. It provides interoperability through the HL7 FHIR R4 standard, for which the project publishes a FHIR implementation guide, alongside ASTM and HL7 v2 interfaces for laboratory analyzers and LOINC and SNOMED terminology, and is aligned with the OpenHIE architecture for exchange with electronic medical records and health information exchanges. It is released under the Mozilla Public License 2.0. OpenELIS is recognised as a Digital Square "global good for health" and is listed as a digital public good by the Digital Public Goods Alliance.
Surface-enhanced laser desorption/ionization (SELDI) is a variant of MALDI that is used for the analysis of protein mixtures that uses a target modified to achieve biochemical affinity with the analyte compound.
The vacuum flask was designed and invented by Scottish scientist James Dewar in 1892 as a result of his research in the field of cryogenics and is sometimes called a Dewar flask in his honour. While performing experiments in determining the specific heat of the element palladium, Dewar made a brass chamber that he enclosed in another chamber to keep the palladium at its desired temperature. He evacuated the air between the two chambers, creating a partial vacuum to keep the temperature of the contents stable. Dewar refused to patent his invention; this allowed others to develop the flask using new materials such as glass and aluminium, and it became a significant tool for chemical experiments and also a common household item.
Sources: en.wikipedia.org
Reversed-phase high-performance liquid chromatography with ultraviolet detection at 214 nanometres is the usual approach. Peak area percentage provides a purity figure relative to other components in the sample. Mass spectrometry is then applied to confirm identity.
Aspartate can cyclise into a succinimide intermediate that later hydrolyses back as isoaspartate. Both forms share the same molecular mass, so mass spectrometry alone cannot tell them apart. This shapes how purity data should be interpreted.
Freeze-dried material is normally kept desiccated below minus twenty degrees Celsius and shielded from light. Solutions are prepared shortly before use and held cold. Repeated thawing is avoided because it accelerates aggregation and degradation.
It is based on epithalamin, a peptide-rich preparation obtained from pineal gland tissue and studied in the former Soviet Union. Researchers later identified the tetrapeptide AEDG as a constituent fragment of that material. Modern supplies are produced by chemical synthesis rather than tissue extraction.