A practical reference on semax: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2026-03-11 and is reviewed periodically as new material appears.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Appearance | White lyophilized powder | Typical for synthetic peptides |
| Solubility | Freely soluble in water | Also soluble in saline |
| Storage temperature | -20 C or below | Protect from repeated freeze-thaw |
| Analytical method | Reverse-phase HPLC | Confirms purity and identity |
| Common synonym | ACTH(4-10) analog | Reflects structural origin |
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。
稳定性主要由水解与氧化两条路径支配。肽键在中性或弱酸性条件下相对稳定，遇到强碱或长时间高温则明显断裂；甲硫氨酸侧链容易被氧化成亚砜，使主峰前移并拉低实际含量。金属离子、光照和反复冻融会进一步促进降解或聚集。冻干粉在低温避光条件下可存放较长时间，配制后的水溶液通常需要冷藏并尽快用完。
纯度评估以反相高效液相色谱为主，通过主峰面积百分比给出粗略结果，再配合电喷雾质谱核对分子量。氨基酸分析可验证组成比例，手性色谱或毛细管电泳用于检查残基构型。常见杂质包括缺失序列的短肽、氧化产物与二聚体。由于多数市售品不附带完整检验报告，独立第三方检测常被用来核实标称值。
从分子层面看，Semax 是线性七肽，没有二硫键、糖基或脂链修饰，N 端为游离氨基，C 端为游离羧基。分子含组氨酸与谷氨酸侧链，因此在水和甲醇等极性溶剂中溶解良好，在非极性溶剂中溶解有限。计算分子量约为 814 Da，与其质子化离子的质荷比吻合，可用于质谱确认。
=== Laboratory reactions === Sulfur dioxide is one of the few common acidic yet reducing gases. It turns moist litmus pink (being acidic), then white (due to its bleaching effect). It may be identified by bubbling it through a dichromate solution, turning the solution from orange to green (Cr3+ (aq)). It can also reduce ferric ions to ferrous. Sulfur dioxide can react with certain 1,3-dienes in a cheletropic reaction to form cyclic sulfones. This reaction is exploited on an industrial scale for the synthesis of sulfolane, which is an important solvent in the petrochemical industry.
Anterior vaginal wall prolapse Cystocele (bladder into vagina) Urethrocele (urethra into vagina) Cystourethrocele (both bladder and urethra) Posterior vaginal wall prolapse Enterocele (small intestine into vagina) Rectocele (rectum into vagina) Apical vaginal prolapse Uterine prolapse (uterus into vagina) Vaginal vault prolapse (roof of vagina) - after hysterectomy Pelvic floor dysfunction can result after treatment for gynecological cancers. Damage to the pelvic floor not only contributes to urinary incontinence but can also lead to pelvic organ prolapse. Pelvic organ prolapse occurs in women when pelvic organs (e.g. the vagina, bladder, rectum, or uterus) protrude into or outside of the vagina. The causes of pelvic organ prolapse are not unlike those that also contribute to urinary incontinence. These include inappropriate (asymmetrical, excessive, insufficient) muscle tone and asymmetries caused by trauma to the pelvis. Age, pregnancy, family history, and hormonal status all contribute to the development of pelvic organ prolapse. The vagina is suspended by attachments to the perineum, pelvic side wall and sacrum via attachments that include collagen, elastin, and smooth muscle. Surgery can be performed to repair pelvic floor muscles. The pelvic floor muscles can be strengthened with Kegel exercises. Disorders of the posterior pelvic floor include rectal prolapse, rectocele, perineal hernia, and several functional disorders, including anismus.
== Metabolism == Studies of the metabolism of synephrine by monoamine oxidases derived from rat brain mitochondria showed that synephrine was a substrate for deamination by both MAO-A and MAO-B, with Km = 250 μM and Vmax = 32.6 nM/mg protein/30 minutes; there was some evidence for preferential deamination by MAO-A.
Also in the year 1808, at the conclusion of the Spanish reconquest of Santo Domingo and the repossession of the Eastern half of Hispaniola by Spain, the Governor General of Cuba sent all of the recent arrived refugees back to that colony. In so doing, these immigrants then dismantled their two Lodges they had been operating, Concordia and Perseverancia, and left the island. Many of these refugees moved to New Orleans, Louisiana District by 1809, and the next year, established the Concorde Lodge, No. 117, chartered under the Grand Lodge of Pennsylvania. Later in 1810, with three other Lodges in New Orleans, they established the Grand Lodge of Louisiana. Perseverancia was also reorganized in New Orleans under the name Perseverance Lodge No. 118. The only one of these Lodges that remained in Cuba was the Temple of the Theologic Virtues, and it also changed its name to Spanish; Templo de las Virtudes Teologales. The French members mostly having left the island, the remaining members were mostly Creole.
Sources: en.wikipedia.org
=== Urodeles === Salamanders, including newts and axolotls, are species with the most known regenerative abilities. Adult newts can regenerate limbs, tail, upper and lower jaws, spinal cord, retinas, lenses, optic nerves, intestine, and a portion of its heart ventricle Axolotls share the same abilities, save the retina and lens. These animals are important to the study of dedifferentiation because they use dedifferentiation to create new progenitor cells. This is different from mammalian regeneration, because mammals use preexisting stem cells to replace lost tissues. Dedifferentiation in the newt occurs 4–5 days after limb amputation and is characterized by cell cycle re-entry and down-regulation of differentiation markers. cell differentiation is determined by what genes the cell expresses, and down-regulation of this expression would make for a less, or “un”, differentiated cell. Re-entry into the cell cycle allows the cell to go through mitosis, dividing to make more cells that would be able to provide new tissue. It has been observed that actinomycin D prevents dedifferentiation in newts
Pescetarianism, which includes fish and possibly other forms of seafood. Pollotarianism, which includes chicken and possibly other poultry. Semi-vegetarianism is contested by vegetarian groups, such as the Vegetarian Society, which states that vegetarianism excludes all animal flesh. In India, eggs are conventionally classified as non-vegetarian; under Food Safety and Standards Authority of India labeling rules, packaged foods containing egg must carry the brown non-vegetarian mark.
=== Nutrition === In 2003, a Center for Science in the Public Interest report stated that Chipotle's burritos contain over 1,000 calories, which is nearly equivalent to two meals' worth of food. MSNBC Health.com placed the burritos on their list of the "20 Worst Foods in America" because of their high caloric content and high sodium. When a burrito with carnitas, rice, vegetables, cheese, guacamole, and salsa was compared with a typical Big Mac, the burrito had more fat, cholesterol, carbohydrates, and sodium than the Big Mac, but it also had more protein and fiber. The restaurant has also received praise—Health.com included the restaurant in its list of the "Healthiest Fast Food Restaurants". Chipotle's vegetarian options include rice, black beans, fajita vegetables (onions and bell peppers), salsa, guacamole, queso and cheese. All items other than the meats, cheese, sour cream, queso and honey vinaigrette dressing are vegan. As of late 2013, Chipotle developed a new cooking strategy for the pinto beans, eliminating the bacon and making them vegetarian and vegan-friendly. The cheese is processed with vegetable-based rennet in order to be suitable for vegetarians. In April 2010, Chipotle began testing a vegan "Garden Blend" option, which is a plant-based meat alternative marinated in chipotle adobo, at six locations in the U.S. The flour tortillas used for the burritos and soft tacos are the only items that contain gluten.
Sources: en.wikipedia.org
It is associated with the melanocortin receptor family, particularly subtypes found in the central nervous system. This interaction is separate from the adrenal pathway activated by full-length ACTH.
Peptidases degrade the compound within minutes in circulation. This short half-life is one reason nasal delivery is used, placing the substance close to the olfactory and trigeminal pathways.
No large multicenter trials have been published in English-language journals. The existing human evidence consists mainly of smaller studies conducted in Russia, which limits generalization.
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.