epithalamin raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2026-06-07. Anything still debated is marked as such rather than presented as settled.
The published literature is dominated by a small number of research groups, much of it in Russian-language journals, and independent replication outside those groups is limited. Studies are typically small, use cultured cells or rodent models, and report endpoints that differ between papers, which makes comparison difficult. Large randomised human trials have not appeared in the indexed literature. Questions about absorption, distribution and clearance are therefore still treated as open in reviews that mention the compound.
Epitalon is a synthetic tetrapeptide with the sequence alanine–glutamate–aspartate–glycine, commonly abbreviated AEDG. Its design traces to epithalamin, a peptide fraction prepared from bovine pineal gland extracts that researchers in Saint Petersburg began investigating in the 1970s. The compound has a molecular formula of C14H22N4O9 and a nominal molecular mass near 390 daltons. It holds no approved drug status in the United States or the European Union, and material sold under this name is generally offered as a research chemical rather than a finished pharmaceutical product.
Stability depends strongly on pH, temperature and the presence of oxygen and trace metals. Cleavage of the backbone proceeds faster under neutral to alkaline conditions, whereas acidic solutions tend to slow that reaction. The aspartate and glutamate side chains can undergo deamidation or imide formation over time, generating closely related impurities. Published stability data specific to epitalon are sparse, so the usable life of a given solution is best regarded as an open question that depends on buffer composition, concentration and storage temperature.
Identity and purity are usually assessed by reversed-phase high-performance liquid chromatography with ultraviolet detection, frequently near 214 nanometers where the peptide bond absorbs. Mass spectrometry, most often with electrospray ionization, confirms the observed molecular mass and helps separate the intact peptide from truncated or modified forms. Amino acid analysis or tandem mass spectrometry can establish residue order. Purity is commonly quoted as an area percentage, yet such values are method-dependent, and comparisons between laboratories require matching column, gradient and detection wavelength.
Laboratory handling begins with dissolution of the lyophilized powder in water or a suitable aqueous buffer. The dry solid is the more stable form, so stock solutions are generally prepared only when required and kept cold afterwards. Repeated freezing and thawing of a solution is avoided because it encourages aggregation and gradual loss of the intact chain. Diluents and containers are selected to limit adsorption of a short peptide onto plastic surfaces and to reduce microbial growth in aqueous preparations.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C14H22N4O9 | Synthetic tetrapeptide, four residues |
| Nominal mass | Approximately 390 Da | Free peptide; salt forms differ |
| Appearance | White to off-white powder | Commonly supplied lyophilised |
| Solubility class | Freely soluble in water | Also dissolves in aqueous buffer |
| Typical storage | −20 °C, desiccated | Cold packs used during transport |
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.
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.
The peptide emerged from research carried out in Saint Petersburg from the late 1980s onward, where investigators searched for shorter active fragments of a pineal preparation known as epithalamin. The name epitalon was chosen to reflect that parent extract. Early reports described effects on neuroendocrine markers and on the lifespan of laboratory animals. Much of that work appeared in Russian-language journals, with English translations following later, which affects how readily the original protocols can be assessed by outside groups.
Published studies on epitalon are dominated by a small number of research groups, and independent replication in other laboratories remains limited. Proposed mechanisms include activation of telomerase and modulation of melatonin rhythms, but the evidence for either rests mainly on cell cultures and animal models. Whether the peptide produces comparable effects in humans is an open question, and the absence of large controlled trials means the literature is best read as exploratory rather than settled.
Epitalon is a synthetic four-amino-acid peptide with the sequence alanine-glutamate-aspartate-glycine, commonly abbreviated AEDG. Its molecular formula is C14H22N4O9, and its calculated molar mass is approximately 390.35 grams per mole. The compound is a short fragment related to a peptide fraction isolated from bovine pineal gland extracts, and it is normally supplied as a lyophilised powder intended for laboratory research. It is not a registered pharmaceutical product in most countries.
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Povidone-iodine is a broad spectrum antiseptic for topical application in the treatment and prevention of wound infection. It may be used in first aid for minor cuts, burns, abrasions and blisters. Povidone-iodine exhibits longer lasting antiseptic effects than tincture of iodine, due to its slow absorption through soft tissue, making it the choice for longer surgeries. Chlorhexidine is almost twice as effective in preventing infection after surgery with a similar to lower risk of adverse events, and the combination of sodium hypochlorite and hypochlorous acid in very low concentration is significantly superior for wound healing. Consequently, PVP-I has found broad application in medicine as a surgical scrub; for pre- and post-operative skin cleansing; for the treatment and prevention of infections in wounds, ulcers, cuts and burns; for the treatment of infections in decubitus ulcers and stasis ulcers; in gynecology for vaginitis associated with candidal, trichomonal or mixed infections. For these purposes PVP-I has been formulated at concentrations of 7.5–10.0% in solution, spray, surgical scrub, ointment, and swab dosage forms; however, use of 10% povidone-iodine though recommended, is infrequently used, as it is poorly accepted by health care workers and is excessively slow to dry. Because of these critical indications, only sterile povidone-iodine should be used in most cases. Non-sterile product can be appropriate in limited circumstances in which people have intact, healthy skin that will not be compromised or cut.
=== Click chemistry === Thionyl tetrafluoride can be used in click chemistry through reactions with primary amines known as sulfur(VI) fluoride exchange (SuFEx). This kind of reaction was the first "click" reaction to generate a three-dimensional core. Reactions with amines will lead to the corresponding sulfurimidoyl difluoride, which has been used in multiple high throughput screening efforts to discover new inhibitors or molecular glue degraders.
Sources: en.wikipedia.org
=== Coenzyme function === Vitamin B12 functions as a coenzyme, meaning that its presence is required in some enzyme-catalyzed reactions. Listed here are the three classes of enzymes that sometimes require B12 to function (in animals):
In a 12-week randomized controlled trial, modafinil significantly improved nighttime wakefulness as measured by sleep latency testing, reduced attention lapses, and lowered the rate of accidents or near-accidents during the commute home from work. However, residual sleepiness remained substantial even with treatment, and modafinil did not fully normalize alertness to daytime levels. A separate trial found that modafinil also improved patient functioning and mental health-related quality of life in shift workers. A Cochrane review concluded that modafinil and armodafinil increase alertness and reduce sleepiness in shift workers to some extent, but noted that evidence remains limited and the drugs are associated with adverse events including headache and nausea. Modafinil performs moderately as a drug to overcome excessive daytime sleepiness caused by obstructive sleep apnea. People with apnea should typically use a continuous positive airway pressure apparatus to prevent apnea before starting modafinil. When obstructive sleep apnea is comorbid with narcolepsy, modafinil is an effective drug to reduce the associated excessive daytime sleepiness. Both the American Academy of Sleep Medicine and European guidelines strongly recommend modafinil as a first-line treatment for narcolepsy. In France, modafinil is the first-line pharmacological treatment for excessive daytime sleepiness in narcolepsy, with methylphenidate designated as second-line.
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The dressing is applied to a cleaned wound, and usually used to treat uninfected wounds. The dressings may be used, under medical supervision and with an antibiotic to treat the infection, even where aerobic bacterial infection is present. In addition to treating abrasions, minor incisions and lacerations, and superficial puncture wounds, hydrocolloid dressings are used to cover skin-graft donor sites, burns, and cutaneous ulcers (including pressure ulcers or "bed sores", venous ulcers, and diabetic foot ulcers). Small hydrocolloid patches are sometimes also used for acne, to heal the pimples and avoid scars from them. Large dressings with a consistent, adhesive film across the active side (rather than a central pad of hydrocolloid foam) can be cut into smaller strips or other shapes, for use in place of a traditional adhesive bandage of the same size. An indirectly medical use of strips of hydrocolloid dressing is as an alternative to surgical tape, e.g. to secure a nasogastric tube or CPAP mask to a patient's face.
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Sources: en.wikipedia.org
=== Sources === Tortora, Manuela De Matteis (1994), "Some Plants Described by Pliny for the Treatment of Renal Diseases", Am J Nephrol, 14 (4–6): 412–417, doi:10.1159/000168756, PMID 7847477 DeLong, Deanna (1992), "Cherries", How to dry foods, HPBooks, p. 29, ISBN 978-1-55788-050-5 Yu, L.; Mazza, G.; Jayas, D. S. (1999), "Moisture sorption characteristics of freeze-dried, osmofreeze-dried, and osmo-air-dried cherries and blueberries", Transactions of the American Society of Agricultural Engineers, 42 (1): 141–147, doi:10.13031/2013.13189, archived from the original on 2011-07-11 Barrett, Diane M.; Somogyi, Laszlo P.; Ramaswamy, Hosahalli S. (2004), "Dehydrated cherries", Processing Fruits: Science and Technology, CRC Press, 2004, pp. 506–507, ISBN 978-0-8493-1478-0 Ward, Ruby; Bailey, DeeVon; Miner, Dean (2004), "Southridge Farms: Moose Droppings for Sale" (PDF), Western Profiles of Innovative Agricultural Marketing: Examples from Direct Farm Marketing and Agri-Tourism Enterprises, University of Arizona, pp. 83–88, ISBN 978-0-9748669-0-1, archived from the original (PDF) on 2009-01-15, retrieved 2009-06-25 Snell, Alma Hogan; Castle, Lisa; Kindscher, Kelly (2006), A taste of heritage: Crow Indian recipes & herbal medicines, University of Nebraska Press, ISBN 978-0-8032-9353-3
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thymidine (T, dT) Also deoxythymidine. One of the four standard nucleosides used in DNA molecules, consisting of a thymine base with its N9 nitrogen bonded to the C1 carbon of a deoxyribose sugar. The prefix deoxy- is commonly omitted, since there are no ribonucleoside analogs of thymidine used in RNA, where it is replaced with uridine instead.
Most perceivable colors can be formed by mixing different amounts of three primary colors. This allows precise dynamic color control. Their emission power decays exponentially with rising temperature, resulting in a substantial change in color stability. Such problems hinder industrial use. Multicolor LEDs without phosphors cannot provide good color rendering because each LED is a narrowband source. LEDs without phosphors, while a poorer solution for general lighting, are the best solution for displays, whether they are LCD-backlit or direct LED-based pixels. Dimming a multicolor LED source to match the characteristics of incandescent lamps is difficult because manufacturing variations, age, and temperature change the actual color value output. To emulate the appearance of dimming in incandescent lamps, LEDs may require a feedback system with color sensor to actively monitor and control the color.
Kevin Billings, Honorary Group Captain, 601 (County of London) Squadron, Royal Auxiliary Air Force. For services to the Royal Air Force in the United States of America and the UK. Paul Britton, Chair, Tate Americas Foundation. For services to the arts and to philanthropy. Kevin Burke, Arts Philanthropist and Board Member, BAFTA Hong Kong Advisory Board. For services to charity and to philanthropy. Philip Hugh Davies, Principal, Philip Davies (Heritage and Planning) Ltd. For services to UK and Commonwealth Heritage. Luke Dearden, lately Political Counsellor, UK Delegation to NATO, Brussels, Belgium. For services to British Foreign and Security Policy. Duncan Edwards, Chief Executive Officer, BritishAmerican Business, and Honorary Director, The St. George's Society, New York, United States of America. For services to UK/US Trade relations and to charity. Lieutenant Colonel (Rtd) Michael Edwards, lately Senior Reports Officer, Ceasefire and Transitional Security Arrangements Monitoring and Verification Mechanism, Juba, South Sudan. For services to peace in South Sudan. Brian Hancock, Surgeon, Wythenshaw Hospital; Founding Member and Trustee, Uganda Childbirth Injury Fund. For services to surgery in Sub-Saharan Africa. Susan Hannam, Vice President, CUDECA Hospice Foundation, Spain. For services to palliative care and volunteering services in Spain. Laura Hickey, lately Director Multilateral and Human Rights, Foreign, Commonwealth and Development Office. For services to crisis management and British Foreign Policy.
Sources: en.wikipedia.org
No. Epithalamin is a heterogeneous peptide fraction obtained from pineal gland extract and contains many components. Epitalon is a single synthetic tetrapeptide with the sequence Ala-Glu-Asp-Gly. Researchers synthesised the shorter peptide while attempting to identify active sequences within the extract.
No endogenous peptide with this exact sequence has been described as a circulating hormone or signalling molecule. The tetrapeptide was designed as a synthetic analogue based on fragments observed in pineal preparations. Any activity discussed in the literature therefore refers to administered material rather than to a natural pool of the compound.
It is not an approved medicine in major jurisdictions and does not appear in the major pharmacopoeias. Material is usually distributed as a research chemical or laboratory reagent. Such labelling places handling responsibility on the purchaser and does not indicate that a regulatory body has reviewed the substance.
The dry powder is typically held at -20 degrees Celsius or lower, protected from light and moisture. Allowing a sealed vial to reach room temperature before opening reduces condensation on its contents. Conditions stated on a supplier certificate of analysis take precedence over general guidance.