Everything below concerns Electrospray ionization. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-01-24. Where a claim depends on a specific study, the study is described rather than over-claimed.
Common degradation pathways include oxidation of the methionine side chain, hydrolysis of the peptide backbone, and aggregation under unfavourable pH or concentration. Stability studies typically monitor the main peak by chromatography and report total related substances as a percentage. Because no official monograph exists, acceptance criteria vary between laboratories, and reported purity values are not directly comparable across suppliers. Analysts therefore document the method, column, and detection wavelength alongside each result, and open questions remain about how much biological activity the oxidised forms retain.
Solid semax is typically supplied as a lyophilised powder that is hygroscopic and sensitive to moisture, light, and repeated temperature cycling. Long-term storage of the dry peptide is generally recommended at approximately -20 degrees Celsius, while shorter working periods may use refrigeration at 2 to 8 degrees Celsius. Vials should remain tightly closed and desiccated when brought to room temperature, because condensation can damage the material before it is weighed. Dividing a batch into aliquots is preferable to thawing one container repeatedly.
The C-terminal Pro-Gly-Pro extension is not incidental. Proline-rich tails are known to resist several common peptidases, and the published literature attributes the longer half-life of Semax, relative to unmodified ACTH fragments, to this feature. The modification also removes the melanocyte-stimulating and corticosteroidogenic activity that characterizes longer ACTH-derived sequences. Because the molecule is small and hydrophilic, it is typically formulated as an aqueous solution for intranasal or parenteral delivery. Acetylation or amidation at the termini appears in closely related research peptides and shifts the mass by a fixed increment.
Reported pharmacological work centers on neurotrophic signaling, including changes in BDNF and NGF expression in hippocampal tissue in animal models. Human data come largely from studies conducted in Russia, and how well those results generalize to other populations remains an open question. Regulatory status differs sharply by jurisdiction: Semax is a registered prescription medicine in Russia, while it holds no approved marketing status in the United States or the European Union. Outside such jurisdictions it is generally handled as a research chemical, which affects both documentation and quality expectations.
| Property | Value | Notes |
|---|---|---|
| Typical analytical method | Reversed-phase HPLC with UV detection | Separates target peptide from truncated and oxidised forms |
| Identity confirmation | LC-MS or ESI-MS | Compares observed and calculated molecular ion |
| Primary degradation route | Methionine oxidation | Forms the sulfoxide; monitored as an early-eluting peak |
| Short-term storage | 2 to 8 degrees Celsius | Applies to working vials and reconstituted portions |
| Common synonyms | ACTH(4–10) analogue, MEHFPGP | Descriptive names used in laboratory catalogues |
Identity and purity of Semax are established mainly by reversed-phase high-performance liquid chromatography coupled with mass spectrometry. The chromatographic trace gives a purity estimate as a percentage of total peak area, while electrospray or matrix-assisted laser desorption ionization confirms the molecular mass against the calculated value. Amino acid analysis and sequence-specific fragmentation provide further confirmation when a supplier's chain of custody is unclear. Vendors frequently quote a purity figure without stating the detection wavelength or the integration method, which limits how far one number can be compared with another.
Stability depends heavily on physical state. Lyophilized powder held dry, cold and dark retains its content over long periods, whereas dissolved peptide begins to change within days at room temperature. The most cited degradation route is oxidation of the methionine residue, which converts the peptide to a sulfoxide form that elutes differently on chromatography. Hydrolysis of amide bonds and adsorption onto container walls contribute smaller losses. Buffers that exclude oxygen from the headspace slow the oxidation pathway, but no single condition prevents all change indefinitely.
Practical handling follows from those properties. Bulk material is best divided into single-use portions soon after receipt, because each thaw exposes the whole container to moisture and temperature cycling. Vials should be allowed to reach room temperature before opening to prevent condensation on the powder. Low-binding plasticware reduces loss of dilute solutions, and sterile filtration is used when a preparation must remain free of microbial growth. Records of batch number, reconstitution date and storage history are what allow a later analytical result to be interpreted meaningfully.
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. It corresponds to the ACTH(4-7) fragment extended at the C-terminus by a Pro-Gly-Pro tripeptide, an addition intended to slow enzymatic breakdown. The molecular formula is C37H51N9O10S and the molecular mass is approximately 814 daltons. In the literature it is often described as an ACTH(4-10) analog, although that label reflects a naming convention as much as a precise structural relationship. The compound was developed in Russia and remains most closely associated with that research tradition.
Laboratory descriptions of the material are consistent across suppliers. It appears as a white to off-white lyophilized powder that dissolves readily in water and in polar organic solvents such as dimethyl sulfoxide. Aqueous solutions are clear and colorless at low concentrations. Because the peptide contains methionine, oxidation at the sulfur atom is a recognized degradation pathway, and handling notes usually call for protected, desiccated storage. Reported purity for research-grade lots is generally above 95 percent as measured by reversed-phase high-performance liquid chromatography.
The compound is registered in Russia as a pharmaceutical product, most commonly formulated as a nasal solution, and has been used in that setting since the 1990s. Outside that jurisdiction it is generally handled as a research chemical rather than an approved medicine. Regulatory status therefore differs sharply between countries, and material sold internationally may not correspond to the Russian pharmaceutical formulation. Documentation with commercial samples is typically limited to a certificate of analysis covering purity and identity, not clinical status or local legal classification.
== External links == Syria at Human Rights Watch Syria Charter of Rights and Freedoms Is a proposed modern system of human rights for adoption prior to a new Syrian constitution. 2010 Human Rights Report: Syria, U.S. Department of State, 8 April 2011 "Syria rights activist jailed for five years". Middle East Online. April 24, 2007. Archived from the original on September 28, 2007. Retrieved April 26, 2007. Uprising against the Assad Regime in Syria: Is This a Second Libya? June 2011, Qantara.de Worrall, James; Hightower, Victoria Penziner (2021). "Methods in the madness? Exploring the logics of torture in Syrian counterinsurgency practices". British Journal of Middle Eastern Studies. 49 (3): 418–432. doi:10.1080/13530194.2021.1916154. S2CID 234872905.
Pilonidal cysts can be itchy and often very painful, and typically occur between the ages of 15 and 35. Although usually found near the coccyx, the condition can also affect the navel, armpit, the cheek, or the genital region, though these locations are much rarer. Signs and symptoms may include:
=== Fisher King's injury === The injury is a common theme in the telling of the Grail Quest. While the details and location of the injury vary, the injury ultimately represents the inability of the Fisher King to produce an heir. Although some iterations have two kings present, one or both are injured, most commonly in the thigh. The wound is sometimes presented as a punishment, usually for philandering. In Parzival, specifically, the king is injured by the bleeding lance as punishment for taking a wife, which was against the code of the "Grail Guardians". In some early storylines Percival asks the Fisher King the healing question, which cures the wound. The nature of the question differs between Perceval and Parzival, but the central theme is that the Fisher King can be healed only if Percival asks "the question". The location of the wound is significant to the legend. In most medieval stories, the mention of a wound in the groin or more commonly the "thigh" (such as the wounding of the ineffective suitor in Lanval from the Lais of Marie de France) is a euphemism for the physical loss of or grave injury to one's genitalia. In medieval times, acknowledging the actual type of wound was considered to rob a man of his dignity, thus the use of the substitute terms "groin" or "thigh", although any informed medieval listener or reader would have known exactly the real nature of the wound. Such a wound was considered worse than actual death because it signaled the end of a man's ability to function in his primary purpose: to propagate his line.
Vaccinations will begin in March in Scotland, early April in England and Wales, and mid-April in Northern Ireland. RMT staff working for Network Rail call off a strike planned for 16 March after being given a fresh pay offer. 8 March The UK experiences its coldest March night since 2010, with −15.2 °C recorded in Kinbrace, Scotland, dipping even further to −15.4 °C by the morning. The Health Security Agency issues a level 3 cold alert for the whole of England, while more than 100 schools across Wales are closed due to snow. The National Institute for Health and Care Excellence (NICE) approves the use of the weight loss drug semaglutide (marketed as Wegovy) by the NHS in England. 9 March The UK government announces a two-year delay in the construction of the Birmingham to Crewe leg of HS2 in order to save costs. Asda and Morrisons lift their restrictions on the sale of fresh produce. Following a trial at the High Court in Aberdeen, retired research scientist Christopher Harrison, 82, is convicted of the murder of his ex-wife, Brenda Page, in 1978. 10 March The UK economy grew by 0.3% in January 2023, official figures show, much more than the 0.1% that was predicted by economists. The King bestows the title of Duke of Edinburgh on his younger brother, Prince Edward. Prime Minister Rishi Sunak attends a summit in Paris with French president Emmanuel Macron and announces the UK will give France £500m over three years to help the UK stop the influx of migrants arriving by boat.
Sources: en.wikipedia.org
With somewhat less evidence, other studies have suggested that SCFRs may suppress the development and/or progression of human autism, schizophrenia, vascular dementia, strokes, pathological anxiety and depression disorders, behavioral and social communication disorders, and postoperative cognitive dysfunction. Some of these studies mention the possibility that SCFA-induced activation of FFAR2 suppresses these diseases and disorders but give no evidence to support this. The studies often do suggest that the SCFAs act by various other mechanisms to achieve their neurological effects. Furthermore, the role of SCFAs in humans with these diseases may be unclear. For example, two extensive reviews found that studies on the role of intestinal SCFAs in multiple sclerosis patients were inconclusive. There is a need to define the precise roles of SCFAs, FFAR2, and the other proposed causal factors in these neurological diseases and disorders.
After surgery, where the fascia has been incised and healing includes a scar that traverses the surrounding structures. Inflammatory diseases of the fascia, called Fasciitis Physical trauma, often injuries related sports or auto-collision Chronic psychomotor dysfunction, often driven by traumatic experiences, SMI, or SUD.
== Treatment == Treatment for AGAT and GAMT mainly consists of creatine supplementation. GAMT treatment may also include ornithine and sodium benzoate supplementation and/or diet restrictions in arginine and/or protein. These have shown to be effective, especially when started early in life. There is no current effective treatment for CTD. Creatine supplementation can have some benefit but because creatine does not easily pass the blood-brain barrier without a functioning transporter, neurological symptoms remain significant.
Sources: en.wikipedia.org
Dry powder is usually kept at about -20 degrees Celsius for long-term storage and at 2 to 8 degrees Celsius for short working periods. Containers should stay sealed and protected from light and moisture to limit degradation.
Oxidation of the methionine residue to the sulfoxide is a frequently reported change, and it usually appears as an earlier-eluting peak in reversed-phase chromatography. Backbone hydrolysis products can also accumulate in aqueous solution.
Liquid chromatography coupled with mass spectrometry is the usual approach, because the observed molecular ion can be compared with a calculated mass of about 813.9 Da. Retention time alone does not establish identity.
The sequence is Met-Glu-His-Phe-Pro-Gly-Pro, a seven-residue peptide. The first four residues correspond to the ACTH(4-10) fragment, and Pro-Gly-Pro is added at the C-terminus. N-acetylated versions also appear in the literature and differ in mass.