This is a working overview of Research chemical, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2026-02-09. Anything still debated is marked as such rather than presented as settled.
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.
Lyophilised epitalon is generally held at minus twenty degrees Celsius in a sealed container kept dry and dark. Cooler conditions are sometimes recommended for long-term archives. The solid takes up moisture readily enough that repeated opening of a vial introduces water, so dividing a batch into smaller portions before storage lowers degradation risk. Aqueous solutions are less durable than the dry powder and are usually prepared shortly before use, then kept cold and shielded from light to slow hydrolysis and oxidation.
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.
Interest in epitalon is usually discussed within the broader field of short peptide bioregulators, a category that includes other synthetic di-, tri-, and tetrapeptides studied by the same research group. These compounds share a common rationale: that small fragments of tissue-derived proteins can retain biological activity and can be produced reproducibly. The category as a whole remains outside mainstream pharmacological consensus, and epitalon specifically has a limited presence in independent, non-Russian research literature, which shapes how its evidence base is described.
Epitalon is a synthetic tetrapeptide with the amino acid sequence alanine-glutamate-aspartate-glycine, abbreviated Ala-Glu-Asp-Gly or AEDG. It was developed by the Russian researcher Vladimir Khavinson and colleagues during work on peptide bioregulators derived from the pineal gland. The compound is short enough to be produced by standard solid-phase peptide synthesis and is typically handled as a lyophilized white powder. Its small size distinguishes it from larger pineal peptides such as epithalamin, a complex extract from which the tetrapeptide was conceptually derived.
The four residues give epitalon a molecular formula of C14H22N4O9 and a molecular weight near 390.35 daltons. The presence of two acidic residues, glutamate and aspartate, makes the free peptide strongly acidic, while the alanine and glycine ends provide neutral, nonpolar character. This combination produces a molecule with substantial water solubility. Because there are no cysteine, methionine, or tryptophan residues, the peptide lacks the most common oxidation-sensitive side chains, which simplifies handling compared with many longer peptides.
| Property | Value | Notes |
|---|---|---|
| Typical purity specification | 95 percent or higher by HPLC area | Higher grades are also offered |
| Primary analytical method | Reversed-phase HPLC, UV detection | Frequently paired with mass spectrometry |
| Confirmatory technique | Electrospray mass spectrometry | Observed mass compared with theory |
| Storage temperature | Minus 20 degrees Celsius, dry powder | Sealed, desiccated, protected from light |
| Solution handling | Prepare fresh before use | Hydrolysis proceeds in aqueous media |
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.
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.
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.
Literature searches for this compound must account for several spelling variants. Indexing databases contain epitalon, epithalon, epithalone, and AEDG, and relevant records are scattered across Russian-language and English-language journals that do not consistently cross-cite. Early publications describe the parent extract as a mixture of many peptides, whereas later work addresses the single synthetic tetrapeptide. That shift in nomenclature complicates comparison between studies, because extract data and tetrapeptide data are sometimes cited interchangeably. A search strategy omitting the alternate spellings will return an incomplete set of references.
== Contraindications == Circulatory collapse, depressed level of consciousness due to any cause, Coma. Severe depression requiring hospitalization or electroconvulsive therapy. Not recommended for use in states of excitement or overactivity.
The Unitized Group Ration – Express (UGR-E or UGR-Express), nicknamed the "kitchen in a carton", consists of meals in self-heating steam table trays based on the UGR-H&S meal offerings. The UGR-E is designed to provide hot meals where feeding a group with hot food would otherwise be unfeasible. Unlike other UGRs, it uses a flameless ration heater and does not require a separate field kitchen. The UGR-E begins heating with the pull of a tab, and can fully heat a meal within 30 to 45 minutes. The UGR-E has 4 breakfast menus, 8 lunch/dinner menus, and 1 holiday menu. Each meal provides an average of 1,300 kcal. Each UGR-E module contains 18 meals, with each pallet holding 400 meals. UGR-E modules have a minimum shelf life of 18 months at 80 °F (26.6 °C).
In other systems considered non-traditional, droplet-based microfluidic system, magnetic microdroplets can be a facile means of fabrication and control of micro and nanomaterials, sometimes called "robots". These nanostructures are formed of magnetic nanoparticles in microdroplets that have been manipulated into specific structures by an applied magnetic field. Microhelices are a multifunctional application of this technology. Monodisperse droplets containing magnetic nanoparticles are generated and subjected to a magnetic field which organizes the nanoparticles into a helical template that is fabricated in place through photoinduced polymerization. These microhelices were shown to be effective at clearing channels that were blocked with semi-solid composites of fats, oils, and proteins, such as those found in arteries. Microhelices and microparticle clusters in magnetic droplets have been demonstrated to be a means of transport for small (500 μm diameter) microparticles, showing applications in drug delivery as well. Non-spherical microstructures have also been fabricated using magnetic microfluidics, demonstrating the minute control that is available. Among the non-spherical microstructures to be fabricated were graphene oxide microcapsules that could be aspirated and reinflated using a micropipette, while also exhibiting photoresponsive and magnetoresponsive behavior.
At low glucose levels, the production of acetyl-CoA is linked to β-oxidation of fatty acids. Fatty acids are first converted to acyl-CoA. Acyl-CoA is then degraded in a four-step cycle of oxidation, hydration, oxidation and thiolysis catalyzed by four respective enzymes, namely acyl-CoA dehydrogenase, enoyl-CoA hydratase, 3-hydroxyacyl-CoA dehydrogenase, and thiolase. The cycle produces a new fatty acid chain with two fewer carbons and acetyl-CoA as a byproduct. Within mitochondria, MCD similarly facilitates acetyl-CoA production by decarboxylating malonyl-CoA, thereby supporting metabolic flexibility during low-glucose states.
Sources: en.wikipedia.org
Dimercaprol and dimercaptosuccinic acid (succimer) are chelating agents that sequester the arsenic away from blood proteins and are used in treating acute arsenic poisoning. The most important side effect is hypertension. Dimercaprol is considerably more toxic than succimer. Dimercaptosuccinic acid monoesters, e.g., MiADMSA, are promising antidotes for arsenic poisoning.
== Experimental evidence == When Pauling and Corey first proposed the alpha sheet, they suggested that it agreed well with fiber diffraction results from beta-keratin fibers. However, since the alpha sheet did not appear to be energetically favorable, they argued that beta sheets would occur more commonly among normal proteins, and subsequent demonstration that beta-keratin is made of beta sheets consigned the alpha sheet proposal to obscurity. However the alpha strand conformation is observed in isolated instances in native state proteins as solved by X-ray crystallography or protein NMR, although an extended alpha sheet is not identified in any known natural protein. Native proteins containing alpha-strand regions or alpha-sheet-patterned hydrogen bonding include synaptotagmin, lysozyme, and potassium channels, where the alpha-strands line the ion-conducting pore. Evidence for the existence of alpha-sheet in a mutant form of transthyretin has been presented. Alpha-sheet conformations have been observed in crystal structures of short non-natural peptides, especially those containing a mixture of L and D amino acids. The first crystal structure containing an alpha sheet was observed in the capped tripeptide Boc–AlaL–a-IleD–IleL–OMe. Other peptides that assume alpha-sheet structures include capped diphenyl-glycine-based dipeptides and tripeptides.
Maryanoff (born 1949), American organic/medicinal chemist Maud Menten (1879–1960), Canadian biochemist Helen Vaughn Michel (born 1932), American nuclear chemist Alexandra Navrotsky (born 1943), American geochemist Dorothy Virginia Nightingale (1902–2000), American organic chemist Yolanda Ortiz (chemist) (1924–2019), Argentine chemist, environmentalist Kathlyn Parker, American organic chemist Emma Parmee, British-born medicinal/organic chemist Marguerite Perey (1909–1975), French physicist, student of Marie Curie, discovered the element francium in 1939 Mary Engle Pennington (1872–1952), American food chemist Eva Philbin (1914–2005), Irish chemist Iphigenia Photaki (1921–1983), Greek organic chemist Darshan Ranganathan (1941–2001), Indian organic chemist Mildred Rebstock (1919–2011), American Pharmaceutical chemist Sibyl Martha Rock (1909–1981), American pioneer in mass spectrometry and computing Elizabeth Rona (1890–1981), Hungarian (naturalized American) nuclear chemist and polonium expert Mary Swartz Rose (1874–1941), Nutrition chemist Melanie Sanford (born 1975), American organic chemist Maxine L. Savitz, American Chemist Patsy Sherman (1930–2008), American chemist, co-inventor of Scotchgard Odette L.
Sources: en.wikipedia.org
== Research == Phenylpiracetam has been studied in the treatment of stroke and glaucoma. The more active enantiomer of phenylpiracetam, (R)-phenylpiracetam, was under development for fatigue related to Parkinson's disease. However, no recent development has been reported. There was also interest in the compound for fatigue related to depression and other conditions, but this was not pursued. (R)-Phenylpiracetam has been identified as a selective atypical dopamine reuptake inhibitor (DRIs), and similarly to other DRIs, shows pro-motivational effects in animals and reverses motivational deficits.
=== Medication === For type B aortic dissections, patients without rupture of the aorta or organ perfusion abnormalities may be treated with medications. For others, including those with type A aortic dissections, surgery is preferred. Aortic dissection generally presents as a hypertensive emergency, and the main consideration of medical management is to decrease the shear stress in the aortic wall by decreasing blood pressure and the heart rate. The target blood pressure should be a mean arterial pressure (MAP) of 60 to 75 mmHg or a systolic blood pressure between 100-120 mmHg, or the lowest blood pressure tolerated. Initial decreases should be by about 20%. The target heart rate is 60-80 beats per minute. Long-term blood pressure control is required for every person who has experienced aortic dissection. Beta blockers are the first-line treatment for patients with acute and chronic aortic dissection. In acute dissection, fast-acting agents can be given intravenously and have doses that are easier to adjust (such as esmolol, propranolol, or labetalol) is preferred. Vasodilators such as sodium nitroprusside can be considered for people with ongoing high blood pressure, but they should never be used alone, as they often stimulate a reflexive increase in the heart rate. Opiates are commonly used for relief of severe pain and may lower the blood pressure further. Calcium channel blockers can be used in the treatment of aortic dissection, particularly if a contraindication to the use of beta-blockers exists.
To start, the resting membrane potential of the Venus flytrap (−120 mV) is lower than animal cells (usually −90 mV to −40 mV). The lower resting potential makes it easier to activate an action potential. Thus, when an insect lands on the trap of the plant, it triggers a hair-like mechanoreceptor. This receptor then activates an action potential that lasts around 1.5 ms. This causes an increase of positive calcium ions into the cell, slightly depolarizing it. However, the flytrap does not close after one trigger. Instead, it requires the activation of two or more hairs. If only one hair is triggered, it disregards the activation as a false positive. Further, the second hair must be activated within a certain time interval (0.75–40 s) for it to register with the first activation. Thus, a buildup of calcium begins and then slowly falls after the first trigger. When the second action potential is fired within the time interval, it reaches the calcium threshold to depolarize the cell, closing the trap on the prey within a fraction of a second. Together with the subsequent release of positive potassium ions the action potential in plants involves an osmotic loss of salt (KCl). Whereas, the animal action potential is osmotically neutral because equal amounts of entering sodium and leaving potassium cancel each other osmotically. The interaction of electrical and osmotic relations in plant cells appears to have arisen from an osmotic function of electrical excitability in a common unicellular ancestors of plants and animals under changing salinity conditions.
Buba Baldeh- former Minister for Youth Sports and Culture Under the PPP Regime. He is the son of the Late Micheal Baldeh who was a member of Parliament in the first Republic. Dawda Bah Samuel Kargbo- Football player Musa Barrow- Football player Musa Juwara Hamza Barry Muhammed Badamosi Seedy Bah
Sources: en.wikipedia.org
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.
The dry powder is commonly kept at minus twenty degrees Celsius, desiccated and away from light. Solutions are generally prepared fresh because they break down faster than the solid form.
Tandem mass spectrometry or enzymatic peptide mapping can establish residue order. A single intact mass value indicates composition and molecular weight but not always the precise arrangement of residues.
Epitalon is a synthetic tetrapeptide composed of four amino acids: alanine, glutamate, aspartate, and glycine. It is written as Ala-Glu-Asp-Gly. The free peptide has a molecular weight of about 390 daltons and is normally supplied as a lyophilized powder.