This is a working overview of lyophilized powder, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2025-09-13 and is reviewed periodically as new material appears.
The peptide is prone to several degradation pathways. Oxidation of the methionine residue produces a sulfoxide that elutes close to the parent peak in many chromatographic systems. Hydrolysis of peptide bonds and deamidation of susceptible residues in related sequences also reduce purity over time. Lyophilised material kept dry at minus twenty degrees Celsius and shielded from light is the most stable form commonly described in laboratory practice.
Material sold for laboratory use varies widely in stated purity and documentation. A certificate of analysis should list the analytical method, the column and detector used, and the observed purity value. Independent verification by an outside laboratory is the practical way to confirm identity when documentation is absent or internally inconsistent. Regulatory status differs by country, and a product legal in one jurisdiction may be unapproved or controlled in another.
Identity and purity of semax are established with reversed-phase high-performance liquid chromatography coupled to ultraviolet detection, usually at 214 nanometres. Mass spectrometry, most often electrospray ionisation in positive mode, confirms the molecular mass and reveals truncated sequences. Amino acid analysis and peptide mapping after enzymatic digestion provide additional structural confirmation. Laboratories typically report purity as the percentage area of the main peak, a figure that does not capture isomeric or oxidised variants unless the method resolves them.
Semax is a synthetic seven-amino-acid peptide whose sequence extends the ACTH(4-10) fragment with a C-terminal proline-glycine-proline tripeptide. The commonly cited sequence is Met-Glu-His-Phe-Pro-Gly-Pro, giving a molecular formula near C37H51N9O10S and a molecular weight close to 813.9 g/mol. It belongs to the broader class of synthetic ACTH fragments studied for central nervous system effects rather than for adrenal steroid stimulation. In practice the material appears as a lyophilized white powder for laboratory work or as a dilute saline solution in clinical settings.
Development is attributed to researchers at the Institute of Molecular Genetics in Moscow during the early 1980s, building on earlier Soviet work with ACTH fragments. Russian regulatory approval followed for intranasal use, and the compound has remained commercially available there for decades. Most published human data originate from Russian and, later, some Eastern European clinical reports, which are not always accessible in English translation. Outside that region the material is generally handled as a research chemical rather than a licensed medicine.
Regulatory status differs sharply between jurisdictions. In Russia the peptide is registered as a prescription nasal preparation, while agencies such as the United States Food and Drug Administration have not approved it for any indication. Products sold elsewhere are typically labeled for laboratory research only, and such labels shift responsibility for safe handling to the purchaser. Because the same name covers pharmaceutical-grade nasal drops and bulk research powder, identity and purity documentation becomes the main practical concern when comparing sources.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white powder | Lyophilised solid |
| Solubility class | Freely soluble in water | Also dissolves in aqueous buffers |
| Typical storage temperature | -20 °C | Dry, desiccated, protected from light |
| Typical analytical method | RP-HPLC with UV detection | Often paired with LC-MS |
| Water content | Reported as Karl Fischer value | Freeze-dried material is hygroscopic |
Published studies are dominated by animal models of stroke, ischemia, and cognitive impairment, with a smaller number of human trials conducted in Russia. Many of the human reports are small, single-center, and published in Russian-language journals, which limits independent scrutiny. Outcome measures vary between studies and often rely on clinician-rated scales rather than objective biomarkers. Systematic reviews have noted the methodological weaknesses and called for larger, preregistered trials before firm conclusions can be drawn.
Claims about enhanced focus, memory, or mood in healthy people rest mostly on anecdotal reports and community discussion rather than on controlled data. It remains unclear whether any cognitive benefit observed in patients recovering from brain injury would extend to uninjured users. Dose-response relationships, long-term safety, and interactions with other drugs are not well characterized in the peer-reviewed literature. Questions about optimal route of administration and treatment duration likewise remain open.
Semax binds to melanocortin receptors and is thought to influence neuronal survival and plasticity rather than to act through the adrenal axis. Laboratory work has shown increased expression of brain-derived neurotrophic factor and nerve growth factor in treated tissue. Changes in c-Fos, a marker of neuronal activation, have also been reported. Because the peptide is rapidly degraded by peptidases, its effects are generally attributed to downstream signaling cascades rather than to sustained receptor occupancy.
Clinical reports describe use in ischaemic stroke, transient ischaemic attack, optic nerve conditions, and cognitive complaints, but most of these studies are small and were conducted in a single region. Systematic reviews have generally described the evidence base as limited in size and variable in methodological quality. Randomised controlled data suitable for international regulatory assessment are scarce. As a result, major treatment guidelines outside Russia do not include the peptide, and interest in it remains largely research-driven rather than routine clinical.
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. It is described in the literature as an analogue of the ACTH(4–10) fragment, a short N-terminal portion of adrenocorticotropic hormone that retains some neurotropic activity without the full hormonal effects of the parent peptide. The molecule carries a methionine residue at the N-terminus and two proline residues near the C-terminus, features that shape both its interactions with receptor systems and its chemical stability. The free peptide corresponds to the formula C37H51N9O10S and a molecular mass near 813.9 Da.
The compound was developed in the 1980s at the Institute of Molecular Genetics in Moscow, where it emerged from research on short ACTH fragments and their effects on the central nervous system. Russian pharmaceutical listings describe it as a nootropic and neuroprotective agent, most often formulated as nasal drops. It is not a marketed medicine in the United States or the European Union, and no pharmacopoeial monograph covers it. Consequently, most published clinical experience with the substance originates from a small number of research centres, mainly in Russia and neighbouring countries.
Solid material is normally kept at minus 20 degrees Celsius in a sealed, desiccated container. Reconstituted solutions are less stable and are usually divided into single-use aliquots before freezing. Repeated freeze-thaw cycles are avoided because they promote aggregation and loss of activity. Light exposure is minimized by using amber glassware or foil wrapping. Published stability data for this peptide are sparse, so recommended storage conditions rest mainly on general practice for short synthetic peptides rather than on dedicated study.
Identity and purity are commonly assessed by reversed-phase high-performance liquid chromatography, with ultraviolet detection near 214 nanometers for the peptide backbone. Mass spectrometry, either electrospray or matrix-assisted laser desorption, confirms molecular mass and detects truncation or modification products. Amino acid analysis can verify composition. Because the sequence contains no strongly absorbing aromatic residue apart from phenylalanine, detection wavelengths are chosen carefully. Purity values above 95 percent are typical for research-grade material.
Breastfeeding Resources – La Leche League International (archived 6 November 2006) "Breast-Feeding Content Resources" – WHO reports on Breast Feeding "Breastfeeding and Breast Milk" – US National Institute of Health Center for Disease Control and Prevention Breastfeeding Academy of Breastfeeding Medicine The World Alliance for Breastfeeding Action LactMed – a database of the safety of drugs to which breastfeeding mothers may be exposed by the US National Library of Medicine
=== University of Tennessee === Helton received an athletic scholarship from the University of Tennessee to play both football and baseball. As a freshman and sophomore, he backed up Heath Shuler at quarterback. Entering his junior season in 1994, he was the backup to senior Jerry Colquitt and ahead of Peyton Manning, who was then a true freshman. After Colquitt tore knee ligaments in the season opener at UCLA, Helton took over as the starter. Three weeks later against Mississippi State, he suffered a knee injury and was replaced by Manning, who went on to break several records. Helton appeared in 12 games during his career with the Volunteers football team, completing 41 of 75 passes for 484 yards, four touchdowns, and three interceptions. In baseball, Helton was awarded the Dick Howser Trophy as the national college baseball player of the year, following his junior baseball season in 1995. During his career at Tennessee (1993–1995), he recorded a .370 batting average with 38 home runs and 238 RBI (both school records), while also pitching 193 innings, registering an ERA of 2.24, with 172 strikeouts and 23 saves. In 1995, he set the Tennessee saves record with 11, while posting a 0.89 ERA. Helton also has the second-longest streak of consecutive scoreless innings in NCAA Division I, with 47 in 1994. Helton spent the summer of 1994 playing for the Orleans Cardinals of the Cape Cod Baseball League (CCBL), where he was named a league all-star. He was inducted into the CCBL Hall of Fame in 2024.
Mubadala Investment Company PJSC (Arabic: شركة مبادلة للاستثمار), or simply Mubadala, is a state-owned global investment firm that acts as one of the sovereign wealth funds of the government of Abu Dhabi. The company was established in 2017 when then-named Mubadala Development Company (now Mamoura Diversified Global Holding) and the International Petroleum Investment Company (IPIC) merged. Headquartered in Abu Dhabi, Mubadala also has offices in London, Rio de Janeiro, New York, San Francisco and Beijing.
Sources: en.wikipedia.org
=== Aston Medal === In 1987 the society announce the establishment of the Aston Medal to be awarded to “individuals deserving special recognition by reason of their outstanding contributions to knowledge in the biological, chemical, engineering, mathematical, medical, or physical sciences relating directly to mass spectrometry”.
Cantrell had the band's engineer, Paul Figueroa, come in to his house and record a lot of his vocals and solos there. The band finished recording the album at the Henson Recording Studios in Los Angeles. Cantrell also said he expected the album to be released "probably sometime this summer." At the press room of the Rock and Roll Hall of Fame Induction Ceremony on April 14, 2018, Cantrell revealed that Alice in Chains had just signed with BMG, and that they had finished mixing their new album. Alice in Chains did not perform live in 2017. The band performed their first concert since October 2016 at the House of Blues in Boston on April 28, 2018. In May 2018, Alice in Chains headlined the festivals Carolina Rebellion, Lunatic Luau, Pointfest, Northern Invasion, the WMMR BBQ festival in Philadelphia, and the Rock on the Range festival in Columbus, Ohio on May 18, 2018, in which they paid tribute to Chris Cornell on the first anniversary of his death covering two Soundgarden songs to close their set, "Hunted Down" and "Boot Camp", respectively. At the end of the show, the lights on stage spelled out "CC" for Chris Cornell and "SG" for Soundgarden as feedback rang out. The band started their European tour in June 2018, and headlined the Tons Of Rock Festival in Norway alongside Ozzy Osbourne and Helloween. Alice in Chains are also scheduled to headline KISW's Pain in the Grass festival in August 2018. The band released a new single, "The One You Know", via Spotify, Amazon and iTunes on May 3, 2018. A music video directed by Adam Mason was released on YouTube the same day.
Several scandals affected Uribe's administration; the Colombian parapolitics scandal expanded during his second term, involving numerous members of the administration's ruling coalition. Many pro-government lawmakers, such as the President's cousin Mario Uribe, were also investigated for their possible ties to paramilitary organizations. At the end of 2007, FARC agreed to release former senator Consuelo González, politician Clara Rojas, and her son Emmanuel, born in captivity after a relationship with one of her captors. Operation Emmanuel was proposed and set up by Venezuelan President Hugo Chávez, with the permission of the Colombian government. The mission was approved on December 26; however, on December 31, FARC claimed that the hostage release had been delayed because of Colombian military operations. At the same time, Colombian President Álvaro Uribe indicated that FARC had not freed the three hostages because Emmanuel may not be in their hands anymore. Two FARC gunmen were taken prisoner. Colombian authorities added that a boy matching Emmanuel's description had been taken to a hospital in San José del Guaviare in June 2005. The child was in poor condition; one of his arms was hurt, he had severe malnutrition, and he had diseases that are commonly suffered in the jungle. Having been evidently mistreated, the boy was later sent to a foster home in Bogotá, and DNA tests were announced to confirm his identity.
Obsidian artifacts first appeared in the European continent in Central Europe in the Middle Paleolithic and had become common by the Upper Paleolithic, although there are exceptions to this. Obsidian played an important role in the transmission of Neolithic knowledge and experiences. The material was mainly used for production of chipped tools which were very sharp due to its nature. Artifacts made of obsidian can be found in many Neolithic cultures across Europe. The source of obsidian for cultures inhabiting the territory of and around Greece was the island of Milos; the Starčevo–Körös–Criș culture obtained obsidian from sources in Hungary and Slovakia, while the Cardium-Impresso cultural complex acquired obsidian from the island outcrops of the central Mediterranean. Through trade, these artifacts ended up in lands thousands of kilometers away from the original source; this indicates that they were a highly valued commodity. X-ray fluorescence techniques have also allowed obsidian in Greece to be identified as coming from Milos, Nisyros or Gyali, islands in the Aegean Sea. John Dee had a mirror, made of obsidian, which was brought from Mexico to Europe between 1527 and 1530 after Hernando Cortés's conquest of the region.
Sources: en.wikipedia.org
Reversed-phase high-performance liquid chromatography is the standard method, with detection in the ultraviolet range. Peak area percentage yields a purity figure for the main component. Mass spectrometry is normally run alongside to confirm molecular identity.
Dry lyophilised powder is generally kept at minus twenty degrees Celsius, protected from light and moisture. Repeated freeze-thaw cycles are avoided because they encourage aggregation and moisture uptake. Solutions are less stable than the solid form and degrade faster at room temperature.
A certificate documents what the supplier measured, not what an independent party confirmed. Methods, instruments and acceptance criteria can differ between suppliers. Third-party testing is the usual way to resolve discrepancies.
It is a short synthetic peptide built from seven amino acids: methionine, glutamic acid, histidine, phenylalanine and three prolines. The sequence derives from the 4-10 fragment of adrenocorticotropic hormone with an added proline-glycine-proline tail. No plant or animal extract is involved; the material is produced by solid-phase peptide synthesis.