Epithalamin raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
This page was last updated on 2026-07-18 and is reviewed periodically as new material appears.
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.
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.
Storage and handling follow conventional peptide practice. Lyophilized epitalon is typically kept refrigerated or frozen, protected from moisture and light, and allowed to equilibrate to room temperature before opening to avoid condensation. Once dissolved, aqueous solutions are usually stored cold and used within a short period, since dilute peptide solutions can support microbial growth and may slowly degrade. The absence of cysteine and methionine reduces, but does not eliminate, oxidation concerns during long-term storage.
Regulatory status varies by country and is not harmonized. Epitalon is not an approved drug in major Western jurisdictions. In some countries it is sold as a research chemical, and in others it has appeared in products marketed for other categories. This inconsistent status means that purity, labeling accuracy, and documentation differ widely between suppliers, and verification of identity and purity through independent analysis is the usual way buyers assess a given lot.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C14H22N4O9 | Free acid form of the tetrapeptide |
| Molecular mass | About 390.35 Da | Calculated monoisotopic value |
| Appearance | White to off-white powder | Typical lyophilized presentation |
| Solubility | Soluble in water | Also dissolves in buffered saline |
| Storage temperature | Minus 20 degrees Celsius | Dry, dark conditions; avoid repeated thawing |
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.
The compound is described in the literature as a derivative of epithalamin, a preparation obtained from bovine pineal tissue. Work on this peptide family was carried out mainly by a research group in Saint Petersburg beginning in the 1980s, and the substance was later registered for clinical use in Russia under the name Epitalon. Outside that region it is generally treated as a research chemical rather than an approved medicine. Statements about its biological activity rest on a relatively small number of studies, and independent replication remains limited.
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.
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.
Reported biological findings come mainly from cell culture and rodent experiments. Those studies describe changes in telomerase catalytic subunit expression, melatonin rhythm amplitude, and antioxidant enzyme activity after peptide exposure. Human data are sparse and consist of small trials with limited blinding and inconsistent endpoints. The proposed mechanisms remain hypotheses rather than established facts, and there is no consensus on whether effects observed in animals carry over to people. Independent replication outside the original research groups is limited, which is a recognised gap in the published literature.
==== Biological metals reclamation ==== For the biological metals reclamation or bio-leaching, the process uses microorganisms to digest metal oxides selectively. Then, recyclers can reduce these oxides to produce metal nanoparticles. Although bio-leaching has been used successfully in the mining industry, this process is still nascent to the recycling industry and plenty of opportunities exists for further investigation.
Software may create copies of individual files such as written documents, multimedia projects, or user preferences, to prevent failed write events caused by power outages, operating system crashes, or exhausted disk space, from causing data loss. A common implementation is an appended ".bak" extension to the file name.
=== Synthesis === Adrenochrome is readily synthesized from commercially available reagents: chloroacetic acid and catechol react in the presence of phosphoryl chloride to yield chloroacetylcatechol. After purification, chloroacetylcatechol is reacted with aqueous methylamine and treated with hydrochloric acid, yielding adrenalone hydrochloride. This is then hydrogenated to racemic adrenaline. Finally, adrenaline is oxidized to adrenochrome by an appropriate oxidizing agent such as silver oxide.
Sources: en.wikipedia.org
While uterine prolapse is rarely life-threatening, the symptoms associated with uterine prolapse can have a significant impact on quality of life. The severity of prolapse symptoms does not necessarily correlate with the degree of prolapse, and one may experience little to no bothersome symptoms with even advanced prolapse. Additionally, different forms of pelvic organ prolapse often present with similar symptoms. Most women who experience pelvic organ prolapse do not have symptoms. When symptoms are present, the most common and most specific symptoms for uterine prolapse—and organ prolapse in general—into the vagina are bulge symptoms, such as pelvic pressure, vaginal fullness, or a palpable vaginal bulge, and these symptoms are often more common and more severe if the prolapse reaches the vaginal hymen. Urinary symptoms, such as uncontrollable loss of urine or difficulty urinating, may also be present. Complete uterine prolapse in which the uterus protrudes through the vaginal hymen is known as procidentia. In the absence of treatment, symptoms of procidentia may include purulent vaginal discharge, ulceration, and bleeding. Complications of procidentia include urinary obstruction. People may also report sexual dysfunction symptoms, such as pain with sexual intercourse and decreased libido. There is conflicting data concerning the effect of pelvic organ prolapse on sexual function. The severity of the symptoms associated with prolapse seems to have a negative effect on sexual activity and reported satisfaction.
Positive psychology has been implemented in business management practice, but has faced challenges. Wong & Davey (2007) noted managers can introduce positive psychology to a workplace, but they might struggle with positive ways to apply it to employees. Furthermore, for employees to welcome and commit to positive psychology, its application within an organization must be transparent. Managers must also understand the implementation of positive psychology will not necessarily combat any commitment challenges that exist. However, with its implementation employees might become more optimistic and open to new concepts or management practices. In their article "The Benefits of Frequent Positive Affect: Does Happiness Lead to Success?", S. Lyubomirsky et al. report: "Study after study shows that happiness precedes important outcomes and indicators of thriving, including fulfilling and productive work". Positive psychology, when applied correctly, can provide employees with a greater opportunity to use skills and vary work duties. However, changing work conditions and roles can lead to stress among employees if they are improperly supported by management. This is particularly true for employees who must meet the expectations of organizations with unrealistic goals and targets. Thomas and Tasker (2010) showed less worker autonomy, fewer opportunities for development, less-enriched work roles, and lower levels of supervisor support reflected the effect of industry growth on job satisfaction. Can an organization implement positive change? Lewis et al.
== History == Dehydrated meat stock, in the form of tablets, was known in the 17th century to English food writer Anne Blencowe, who died in 1718, and elsewhere as early as 1735. Various French cooks in the early 19th century (Lefesse, Massué, and Martin) tried to patent bouillon cubes and tablets, but were turned down for lack of originality. Nicolas Appert also proposed such dehydrated bouillon in 1831. Portable soup was a kind of dehydrated food used in the 18th and 19th centuries. It was a precursor of meat extract and bouillon cubes, and of industrially dehydrated food. It is also known as pocket soup or veal glue. It is a cousin of the glace de viande of French cooking. It was long a staple of seamen and explorers, for it would keep for many months or even years. In this context, it was a filling and nutritious dish. Portable soup of less extended vintage was, according to the 1881 Household Cyclopedia, "exceedingly convenient for private families, for by putting one of the cakes in a saucepan with about a quart of water, and a little salt, a basin of good broth may be made in a few minutes." In the mid-19th century, German chemist Justus von Liebig developed meat extract, but it was more expensive than bouillon cubes. It is essentially only dehydrated meat stock. Industrially produced bouillon cubes were commercialized by Maggi in 1908, by Oxo in 1910, and by Knorr in 1912. By 1913, at least 10 brands were available, with salt contents of 59–72%.
Sources: en.wikipedia.org
β-Hydroxythiofentanyl (beta-hydroxythiofentanyl) is an opioid analgesic that is an analog of fentanyl and thiofentanyl. β-Hydroxythiofentanyl was sold briefly on the black market from around 1985, before the introduction of the Federal Analog Act in 1986 which for the first time attempted to control entire families of drugs based on their structural similarity rather than scheduling each drug individually as they appeared. β-hydroxythiofentanyl was anecdotally said to be one of the more favored fentanyl analogs by opiate addicts.
=== January === 2 January – The Japan Meteorological Agency (JMA) publishes its JRA-55 dataset, confirming 2023 as the warmest year on record globally, at 1.43 °C (2.57 °F) above the 1850–1900 baseline. This is 0.14 °C (0.25 °F) above the previous record set in 2016. 3 January – The first functional semiconductor made from graphene is created. 4 January – A review indicates digital rectal examination (DRE) is an outdated routine medical practice, with a lower cancer detection rate compared to prostate-specific antigen (PSA) testing and no benefit from combining DRE and PSA. 5 January Scientists report that newborn galaxies in the very early universe were "banana"-shaped, much to the surprise of researchers. An analysis of sugar-sweetened beverage (SSB) taxes concludes scaling them could yield substantial public health benefits. 9 January Scientists report studies that seem to support the hypothesis that life may have begun in a shallow lake rather than otherwise – perhaps somewhat like a "warm little pond" originally proposed by Charles Darwin. A group of scientists from around the globe have charted paradigm-shifting restorative pathways to mitigate the worst effects of climate change and biodiversity loss with a strong emphasis on environmental sustainability, human wellbeing and reducing social and economic inequality. Researchers have discovered a new phase of matter, named a "light-matter hybrid", which may reshape understanding of how light interacts with matter.
=== Cancer and diabetes === It has been reported that people with LS in Ecuador are resistant to cancer and diabetes and are somewhat protected against aging. This is consistent with findings in mice with a defective growth hormone receptor gene. Among the approximately 100 individuals in this population, there were no reported cases of diabetes and one case of cancer. A 2019 study of individuals with isolated growth hormone deficiency (IGHD type 1B) in Itabaianinha County, Brazil, demonstrated a phenotype consistent with Laron syndrome. Researchers found that these humans had similarly extended healthspan, with resistance to cancer and attenuated effects of aging, but neither patients with LS nor IGHD experienced an increase in their overall lifespan. Recent studies indicate that individuals with Laron syndrome exhibit significantly lower rates of cancer and enhanced metabolic health, likely as a result of reduced insulin-like growth factor 1 (IGF-1) activity, which decreases cell proliferation and activation of cancer-related pathways.
This change from an irregular cavalry force that fought against the enemies of Russia, such as the Ottoman Empire and France, to a repressive gendarmerie deployed against the subjects of the Empire caused much disquiet within the various Hosts, as it was contrary to the heroic ethos of frontier warfare that the Cossacks cherished. In 1879, the Shah of Iran, Nasir al-Din, who had been impressed with the equestrian skills and distinctive uniforms of the Cossacks while on a visit to Russia the previous year, requested that the Emperor Alexander II sent some Cossacks to train a Cossack force for himself. Alexander granted his request and later in 1879 a group of 9 Cossacks led by Kuban Cossack Colonel Aleksey Domantovich arrived in Tehran to train the Persian Cossack Brigade. The shah very much liked the colorful uniforms of the Cossacks and Domantovich devised uniforms for one regiment of the brigade based on the uniforms of the Kuban Cossack Host and another regiment had its uniform based on the Terek Cossack Host. The uniforms of the Cossacks were based on the flamboyant costumes of the peoples of the Caucasus, and what in Russia were viewed as exotic and colorful uniforms were viewed in Iran as a symbol of Russianness. Nasir al-Din, who was widely regarded as a deeply superficial and shallow man, was not interested in having his Cossack Brigade be an effective military force, and for him merely seeing his brigade ride before him while dressed in their brightly colored uniforms was quite enough.
Sources: en.wikipedia.org
Epitalon is a synthetic tetrapeptide built from four amino acids: alanine, glutamate, aspartate, and glycine. It is not extracted from a natural source but made in the laboratory by chemical synthesis. Its short length makes it relatively straightforward to produce at high purity.
No naturally occurring free form of the peptide has been described. The four-amino-acid sequence can appear as a fragment within larger proteins, but that is not the same as the intact compound being present as a circulating molecule. Materials used in research are synthetic.
Purity is usually checked by reverse-phase high-performance liquid chromatography, which separates the target peptide from related impurities. Mass spectrometry is commonly used alongside it to confirm molecular mass. Some suppliers also provide amino acid analysis for additional sequence confirmation.
Identity is normally confirmed by mass spectrometry, which checks the measured mass against the expected value near 390 daltons. Reverse-phase high-performance liquid chromatography is used alongside it to assess purity. Amino acid analysis can provide additional composition data.