mass spectrometry comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Last reviewed on 2026-07-30. Where a claim depends on a specific study, the study is described rather than over-claimed.
The most frequently cited laboratory finding is that AEDG increased telomerase activity and extended telomere length in cultured human somatic cells. That work used fetal fibroblast strains and reported changes in enzyme activity alongside altered division counts. Replication by unrelated groups has been limited, and the published record is largely a single-laboratory series rather than a multi-centre programme. The result supports a hypothesis about peptide influence on gene expression in cell culture; it does not by itself establish an effect on telomere length in living animals or in people.
Animal and clinical reports appear mainly in Russian-language journals from the 1990s and 2000s, covering endpoints such as melatonin rhythm, lifespan in aged rodents, and retinal function. Many of these papers involve small groups, lack blinding or placebo comparison, and are difficult to retrieve through indexed databases. Review articles published in English generally summarise the claims without reanalysing the underlying data. Because no large randomised trial exists, the clinical importance of these reported effects stays unresolved and is properly described as an open question.
No national medicines regulator has approved epitalon as a therapeutic product. It is generally distributed as a research chemical, and in some jurisdictions selling peptides for human consumption without approval is restricted or prohibited. Certificates of analysis accompanying commercial material vary in which tests are performed, and independent verification of identity and purity is uncommon. Statements about anti-ageing or disease-prevention benefits on vendor pages are marketing claims rather than regulatory findings, a distinction that shapes how the compound is discussed in scientific and popular sources alike.
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.
Proposed mechanisms centre on cell-culture observations rather than a defined receptor interaction. Several reports describe increased expression of the telomerase catalytic subunit after exposure of cultured human cells, and the authors attributed the effect to short peptide fragments entering the nucleus and influencing gene transcription. No receptor for the tetrapeptide has been identified, and the free peptide is expected to be degraded rapidly by plasma peptidases. Whether any measurable fraction reaches intact tissues after administration remains an unresolved question rather than an established finding.
| Property | Value | Notes |
|---|---|---|
| Regulatory status | Not an approved drug | Marketed in most countries as a research chemical |
| Main literature language | Russian and English | Early reports concentrated in Russian journals |
| Typical stated purity | ≥95% by HPLC | Supplier declaration, seldom independently verified |
| Principal studied endpoint | Telomerase activity in vitro | Measured in cultured human cells |
| Reported administration routes | Subcutaneous, intranasal | Described in exploratory use reports |
Dissolution is usually performed in water or a suitable aqueous buffer, and the resulting liquid is divided into single-use portions before freezing. Freeze-thaw cycling is a recognised source of loss for short peptides, since each cycle can encourage aggregation or adsorption onto container walls. Working solutions are generally kept cold and used within a short window, although published stability data specific to epitalon are thin. Containers should be marked with concentration and date, and solutions examined for cloudiness before use.
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.
Discussions in the literature often conflate three distinct entities: the pineal extract epithalamin, the isolated tetrapeptide AEDG, and commercial preparations sold under similar names. Reviews citing older Russian-language studies sometimes omit detail on purity, route of administration and control groups, which makes cross-study comparison difficult. Researchers working with the compound generally note the need for independent replication, standardized enzyme assays, and clearer reporting of peptide identity. These caveats are relevant when weighing claims that appear in secondary sources rather than in primary reports.
（TG:@pojiaai）Epitalon is a synthetic linear tetrapeptide with the sequence alanine-glutamate-aspartate-glycine, abbreviated AEDG. It emerged from work on epithalamin, a peptide fraction prepared from bovine pineal tissue, and was designed as a short, chemically defined analogue of that extract. Early publications came mainly from Russian laboratories studying pineal peptides and aging-related endpoints. The compound appears in the literature under several spellings, including epithalon and epithalone, which complicates systematic searching. Its small size makes solid-phase assembly and routine analytical characterization straightforward.
Chemically, the molecule consists of four amino acid residues joined by three peptide bonds, with a free N-terminal amino group and a free C-terminal carboxyl group. Its molecular formula is C14H22N4O9, and its monoisotopic mass is approximately 390 daltons. The acidic glutamate and aspartate side chains give the peptide a net negative charge near neutral pH, a property that shapes its chromatographic behaviour and solubility profile. No disulfide bridges or other post-translational modifications are present, so the primary sequence alone defines the structure.
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.
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.
=== Glycogenolysis === Glycogenolysis refers to the breakdown of glycogen. In the liver, muscles, and the kidney, this process occurs to provide glucose when necessary. A single glucose molecule is cleaved from a branch of glycogen, and is transformed into glucose-1-phosphate during this process. This molecule can then be converted to glucose-6-phosphate, an intermediate in the glycolysis pathway. Glucose-6-phosphate can then progress through glycolysis. Glycolysis only requires the input of one molecule of ATP when the glucose originates in glycogen. Alternatively, glucose-6-phosphate can be converted back into glucose in the liver and the kidneys, allowing it to raise blood glucose levels if necessary. Glucagon in the liver stimulates glycogenolysis when the blood glucose is lowered, known as hypoglycemia. The glycogen in the liver can function as a backup source of glucose between meals. Liver glycogen mainly serves the central nervous system. Adrenaline stimulates the breakdown of glycogen in the skeletal muscle during exercise. In the muscles, glycogen ensures a rapidly accessible energy source for movement.
=== Origins === The Centre Party belongs to the political spectrum of "Political Catholicism" that, emerging in the early 19th century after the turmoil of the Napoleonic wars, had changed the political face of Germany. Many Catholics found themselves in Protestant dominated states. The first major conflict between the Catholic Church and a Protestant state was the "Colonian Church conflict", when the Prussian government interfered in the question of mixed marriages and the religious affiliation of children resulting from these. This led to serious aggressions against the Catholic population of the Rhineland and Westphalia and culminated in the arrest of the Archbishop of Cologne. At that time, one of the founding fathers of Political Catholicism was journalist Joseph Görres, who called upon Catholics to "stand united" for their common goals, "religious liberty and political and civil equality of the denominations". The conflict relaxed after 1840, with Frederick William IV's accession to the throne. The German revolutions of 1848–1849 brought new opportunities for German Catholics. In October, the bishops had their first meeting in 40 years in Würzburg and the local "Catholic Federations" assembled in Mainz to found the "Catholic Federation of Germany". In the National Assembly, which was convened to draw up a German constitution, a "Catholic club" was formed. This was not yet a comprehensive party, but a loose union aimed at protecting the Church's liberties in a future Germany, supported by many petitions from the "[Pope] Pius federations for religious liberty".
== Chemical states == In biological systems, FAD acts as an acceptor of H+ and e− in its fully oxidized form, an acceptor or donor in the FADH form, and a donor in the reduced FADH2 form. The diagram below summarizes the potential changes that it can undergo.
Sources: en.wikipedia.org
== Further reading == Calandre EP, Rico-Villademoros F, Slim M (2016). "Alpha2delta ligands, gabapentin, pregabalin and mirogabalin: a review of their clinical pharmacology and therapeutic use". Expert Rev Neurother. 16 (11): 1263–1277. doi:10.1080/14737175.2016.1202764. PMID 27345098. S2CID 33200190.
Beer has also been developed that counteracts the reduction of taste and smell reception in space and reduces the possibility of wet burps in microgravity. A parabolic flight experiment using Vostok, a specially-produced stout by Four Pines, validated that the reduced carbonation recipe met the criteria intended for space. Barley harvested from crops grown for several generations in space has also been brought back to Earth to produce beer. While not a space food (it used the same high carbonation 'Earth' recipe), the study did demonstrate that ingredients grown in space are safe for production. Space bread has proved elusive because of a variety of challenges. By 2012 a method was suggested where the dough is leavened by dissolved CO2 (as opposed to yeast) and cooked by a low-temperature process, which could allow for fresh bread to be baked from bulk ingredients on future spaceflights.
=== Cellular role === Hydrogen peroxide is a harmful byproduct of many normal metabolic processes; to prevent damage to cells and tissues, it must be quickly converted into other, less dangerous substances. To this end, catalase is frequently used by cells to rapidly catalyze the decomposition of hydrogen peroxide into less-reactive gaseous oxygen and water molecules. Mice genetically engineered to lack catalase are initially phenotypically normal. However, catalase deficiency in mice may increase the likelihood of developing obesity, fatty liver, and type 2 diabetes. Some humans have very low levels of catalase (acatalasia), yet show few ill effects. The increased oxidative stress that occurs with aging in mice is alleviated by over-expression of catalase. Over-expressing mice do not exhibit the age-associated loss of spermatozoa, testicular germ and Sertoli cells seen in wild-type mice. Oxidative stress in wild-type mice ordinarily induces oxidative DNA damage (measured as 8-oxodG) in sperm with aging, but these damages are significantly reduced in aged catalase over-expressing mice. Furthermore, these over-expressing mice show no decrease in age-dependent number of pups per litter. Overexpression of catalase targeted to mitochondria extends the lifespan of mice. In eukaryotes, catalase is usually located in a cellular organelle called the peroxisome. Peroxisomes in plant cells are involved in photorespiration (the use of oxygen and production of carbon dioxide) and symbiotic nitrogen fixation (the breaking apart of diatomic nitrogen (N2) to reactive nitrogen atoms).
Within days of the Alvor Agreement, the Central Intelligence Agency launched its own programme, Operation IA Feature, to arm the FNLA, with the stated objective of "prevent[ing] an easy victory by Soviet-backed forces in Angola". The United States was searching for regional allies to take part in Operation IA Feature and perceived South Africa as the "ideal solution" in defeating the pro-Soviet MPLA. With tacit American encouragement, the FNLA and UNITA began massing large numbers of troops in northern and southern Angola, respectively, in an attempt to gain tactical superiority. The transitional government installed by the Alvor Agreement disintegrated and the MPLA requested support from its communist allies. Between February and April 1975, the MPLA's armed wing, the People's Armed Forces of Liberation of Angola (FAPLA), received shipments of Soviet arms, mostly channelled through Cuba or the People's Republic of the Congo. At the end of May, FAPLA personnel were being instructed in their use by a contingent of about 200 Cuban military advisers. Over the next two months, they proceeded to inflict a series of crippling defeats on the FNLA and UNITA, which were driven out of the Angolan capital, Luanda.
Sources: en.wikipedia.org
=== Olympics === There were concerns dairy products consumed during the 2008 Summer Olympics may have been contaminated. Li Changjiang, the then Director of AQSIQ reassured the international community that all the food, including dairy products, was indeed safe. "We took special quality management measures aimed at food supply for the Games."
==== Total synthesis ==== Some steroidal hormones are economically obtained only by total synthesis from petrochemicals (e.g. 13-alkyl steroids). For example, the pharmaceutical Norgestrel begins from methoxy-1-tetralone, a petrochemical derived from phenol.
Historian William MacArthur once described Knoxville as a "product and prisoner of its environment." Throughout the first half of the 19th century, Knoxville's economic growth was stunted by its isolation. The rugged terrain of the Appalachian Mountains made travel in and out of the city by road difficult, with wagon trips to Philadelphia or Baltimore requiring a round trip of several months. Flatboats were in use as early as 1795 to carry goods from Knoxville to New Orleans via the Tennessee, Ohio, and Mississippi rivers, but river hazards near Muscle Shoals and Chattanooga made such a trek risky. During the 1790s, several roads, many of which followed old Indian trails, were constructed that connected Knoxville to other settlements across East Tennessee. The first of these roads to be constructed was Kingston Pike which was laid out by Charles McClung in 1792. Beginning around 1810, stagecoach service was introduced to Knoxville and continued to operate prior to the Civil War. Known as the "Great Western Line," the route ran westward from Raleigh, North Carolina, over the mountains to Knoxville, and then continued west to Nashville. Although the introduction of stagecoach service somewhat helped to break Knoxville's boundaries of isolation, the trips were often long and rough. During the 1820s and 1830s, state legislators from East Tennessee continuously bickered with legislators from Middle and West Tennessee over funding for road and navigational improvements.
Sources: en.wikipedia.org
Small studies with human participants have been reported, chiefly in Russian-language journals, but they are limited in size and design. No large randomised controlled trial with published results is available.
The most reproducible biochemical observation comes from cultured cells, where the peptide was reported to raise telomerase activity. Whether this translates into measurable health effects in animals or humans is not established.
It is offered as a research chemical for laboratory use, which places it outside the approval pathways applied to medicines. Buyers should expect documentation to differ between suppliers.
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.