A practical reference on Semax: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2026-07-28. Anything still debated is marked as such rather than presented as settled.
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.
Dissolution is normally performed in water, phosphate-buffered saline, or normal saline, since the peptide is freely soluble in aqueous media and is rarely handled with strong organic solvents. Solution pH should be kept near neutral, because extreme acidity or alkalinity accelerates backbone hydrolysis and encourages oxidation of the methionine side chain. Once dissolved, the material is less stable than the dry powder and is commonly divided into single-use portions and frozen. Buffers containing primary amines, such as Tris, are often avoided because of possible side reactions.
Development of the compound took place in the Soviet Union during the 1980s, largely through peptide research groups affiliated with the Shemyakin-Ovchinnikov Institute and Moscow State University. Investigators screened fragments of adrenocorticotropic hormone for activity on the central nervous system while attempting to separate cognitive effects from hormonal ones. The shortened sequence was selected because it retained behavioral activity in animal models without stimulating corticosteroid release. Early publications described the molecule as an ACTH(4-10) analog.
Published research on this peptide originates mainly from Russian laboratories, and the wider international literature is comparatively thin. Studies have used rodent models of stroke, hypoxia, and memory tasks, with a smaller number of human trials reported. Reported outcomes include changes in attention and memory measures, along with effects on neurotrophic factor expression in some experiments. Small sample sizes, inconsistent dosing protocols, and limited independent replication are widely noted limitations, so the strength of the clinical evidence remains an open question.
Semax is a synthetic heptapeptide whose sequence is Met-Glu-His-Phe-Pro-Gly-Pro. The first four residues correspond to the ACTH(4-10) fragment, while the terminal Pro-Gly-Pro extension was added to improve metabolic stability. Its molecular formula is C37H51N9O10S and its monoisotopic mass is approximately 813.9 Da. The compound is classified as a peptide research chemical and as a registered pharmaceutical product in Russia, but it does not hold marketing approval in the European Union or the United States. Naming conventions vary across supplier catalogs.
| 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 |
多数实验室与市售的 Semax 以冻干粉形式提供。冻干粉通常建议保存在 -20 °C 或更低温度下，同时避免光照与反复升温。短期运输有时采用冷藏条件，但长期保存仍以冷冻为主。分包操作应尽量减少开盖次数，以降低吸湿和微生物污染的风险。开封后若未一次用完，建议在干燥环境中密封并尽快放回低温储存。
溶液状态的稳定性明显低于冻干粉。肽类在水溶液中可能经历水解、氧化与聚集，其中甲硫氨酸和天冬酰胺等残基常是敏感位点。Semax 含有甲硫氨酸，因此氧化风险相对突出。工作液一般主张现配现用，或冷藏并在数日内用尽。缓冲液种类、pH 和离子强度都会影响降解速率，而关于最佳条件的公开数据并不统一。
常规纯度与身份确认依赖反相高效液相色谱，并辅以质谱测定分子量。氨基酸组成分析可用于验证序列构成，肽图分析则能进一步定位修饰或降解产物。杂质谱通常关注缺失序列肽、截短片段和氧化产物。不同方法的检出限并不相同，因此各实验室报告的纯度数值不宜直接横向比较。
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. Its design combines the ACTH(4-7) core fragment with a C-terminal Pro-Gly-Pro extension, a modification intended to improve stability and prolong activity. The molecule is hydrophilic, carries no lipid chains or glycosylation, and has a theoretical mass just over 810 daltons in its free form. All seven residues are proteinogenic amino acids, so no non-natural building blocks appear in the backbone. A free N-terminal methionine and C-terminal proline define the unmodified parent peptide.
The compound was developed during the 1980s at the Institute of Molecular Genetics in Moscow as part of research on fragments of adrenocorticotropic hormone. Early work examined short ACTH-derived sequences that retained neurotrophic effects while lacking the endocrine activity of the full hormone. Semax entered clinical use in Russia during the 1990s, where it received registration for several neurological indications. Outside that region it remained primarily a laboratory research material rather than an approved therapeutic. English-language literature on it grew more slowly and frequently cited the original Russian studies.
Terminology around the compound varies by source. It appears in catalogues and papers as Semax, as the heptapeptide ACTH(4-7)-Pro-Gly-Pro, and under various alphanumeric laboratory codes used by individual suppliers. These names refer to the same sequence but may imply different salt forms, purity grades, or counter-ions. Peptide databases usually list the free base mass, while product descriptions sometimes report acetate or trifluoroacetate salts with a different formula weight. Because naming conventions for research peptides are not standardised across vendors, checking the declared sequence and measured mass is more reliable than relying on a trade name alone.
== Interactions == Buspirone has been shown in vitro to be metabolized by the enzyme CYP3A4. This finding is consistent with the in vivo interactions observed between buspirone and these inhibitors or inducers of cytochrome P450 3A4 (CYP3A4), among others:
In response to sustained high levels of migration and growing political pressure, the administration implemented stricter measures beginning in 2023. Biden faced criticism from immigration advocates for extending Title 42, a Trump administration border restriction that arose due to the COVID-19 pandemic, and for restarting the use of "expedited removal" of certain Central American families. In May 2023, the Biden administration approved sending 1,500 more troops to the U.S.-Mexico border as Title 42 expired. In January 2024, Biden expressed support for a proposed bipartisan immigration deal led by Senators Kyrsten Sinema and James Lankford. The proposed bipartisan bill would have allowed Department of Homeland Security (DHS) to close the border when encounters reach a seven-day average of 5,000 or exceed 8,500 in a single day. In addition, the bill would have mandated the detention of migrants seeking asylum and undergoing asylum interviews, with those failing the process repatriated to their home countries. While not addressing the status of "Dreamers", it would have changed immigration law to allow the children of those with H-1B visas to get work authorizations and freeze their legal ages while waiting for green cards, rather than face deportation once they turn 21, and provide additional funding for immigration judges. Former president Donald Trump announced his opposition to the legislation, calling on Congressional Republicans to oppose it; subsequently, leaders such as Speaker of the House Mike Johnson announced their opposition, halting further legislative action.
== Cause == Growth hormone-producing acidophilic pituitary adenomas are the cause of hypersomatotropism in the vast majority of cats. Both dense and sparse granulated cells has been observed in the adenomas of cats with diabetes mellitus and elevated IGF-1 levels; however, it is not known whether this is because of different variants of the disease or not. It is also not known what percentage of tumours are mixed or plurihormonal tumours. This information has only been reported in studies with a small number of cases. In dogs growth hormone is not just derived from the anterior pituitary gland, it also derives from the mammary gland. Mammary gland production of growth hormone is stimulated by progestogen, this occurs naturally in intact bitches. Synthetic progestogens can cause excessive growth hormone secretion and higher IGF-1 levels which may lead to acromegaly and diabetes mellitus. Progestogens are used to prevent oestrus in bitches and to treat certain hyperplasias. Growth hormone excess can occur in the luteal phase of the oestrous cycle in older bitches. Somatotrophic adenomas have only been described in two dogs. In 1996 a 9-year-old male Doberman Pinscher with difficult to manage diabetes mellitus but no signs of acromegaly was euthanised. Necropsy later revealed an acidophilic adenoma with immunohistochemical staining for growth hormone, adrenocorticotropic hormone, and prolactin.
== Overview == Scooter's Coffee uses a franchise model to establish new stores. Some locations are drive-through only and do not have sit-in dining areas. The buildings are standardized and measure 664 square feet (61.7 m2). Its coffee is produced by Harvest Roasting, which was founded alongside Scooter's Coffee. The menu includes hot and cold drinks, including coffee, tea, and smoothies; and food items, such as pastries, burritos, and sandwiches. It also has breakfast and kids menus. Its signature drink is the Caramelicious, an espresso drink with caramel sauce and whipped cream.
Sources: en.wikipedia.org
When HypSys is silenced the production of protease inhibitors induced by wounding is halved compared to wild type plants indicating that both systemin and HypSys are required for a strong defence response against herbivores in tomato. When applied through cut petioles in Petunia, HypSys did not induce the production of protease inhibitors, but instead increased expression of defensin, a gene which produces a protein that inserts into microbial membranes, forming a pore. Defensin expression is also induced by AtPEP1. Tomato plants over-expressing systemin produced more volatile organic compounds (VOCs) than normal plants and parasitoid wasps found them more attractive. Systemin also upregulates the expression of genes involved in the production of biologically active VOCs. Such a response is crucial if antinutritional defences are to be effective, since without predators, developing insects would consume more plant material while completing their development. It is likely that VOC production is upregulated through different pathways, including oxylipin pathway that synthesises jasmonic acid aldehydes and alcohols that function in wound healing. Different AtPeps may allow A. thaliana to distinguish between different pathogens. When inoculated with a fungus, oomycete and a bacterium, the increases in AtPep expression varied depending on the pathogen. A. thaliana overexpressing AtProPep1 was more resistant to the oomycete Phythium irregulare.
Sack–Barabas syndrome (SBS) is an older name for vascular Ehlers–Danlos syndrome (vEDS). It is a medical condition, a subset of Ehlers–Danlos syndrome which especially affects the body's vascular system, including blood vessels and organs, and makes them prone to rupture.
Hardee's was purchased by Canadian company Imasco Limited in 1981. In 1982, General Foods sold Burger Chef to Imasco for $44 million. Imasco converted many locations to Hardee's restaurants and let franchises and locations near existing Hardee's locations convert to other brands. Remaining restaurants that did not convert to Hardee's or new names and branding simply closed. A new management team, in the early 1980s, seeking to cut costs, changed the signature burger recipe and eliminated the flagship menu item, the Big Twin. The Big Deluxe continued to be offered throughout the 1990s. For a few years after acquiring the Roy Rogers Restaurants fast food chain in the early 1990s, Hardee's outlets sold fried chicken prepared using the popular Roy Rogers Restaurant recipe hoping it could compete with KFC. In addition to Roy Rogers, Hardee's also owned Rax Roast Beef for a period of time and sold roast beef sandwiches throughout the Hardee's system.
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.
It is a synthetic peptide of seven amino acids. Its backbone corresponds to a fragment of adrenocorticotropic hormone extended at the carboxyl end. The material is distributed as a lyophilized solid for laboratory use.