lyophilisation raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2026-05-16. Anything still debated is marked as such rather than presented as settled.
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.
Semax is a synthetic heptapeptide whose sequence is Met-Glu-His-Phe-Pro-Gly-Pro. It was developed as a fragment analog of adrenocorticotropic hormone, modeled specifically on the ACTH(4-10) region. The first four residues reproduce that fragment, while a Pro-Gly-Pro tripeptide is appended at the C-terminus. Work on the compound originated in Russia, where it entered clinical use as an intranasal preparation. Its sequence places it among short regulatory peptides studied for effects on the central nervous system rather than on the adrenal axis.
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。
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。
| Property | Value | Notes |
|---|---|---|
| Molecular weight | ~813.9 Da (free heptapeptide) | N-acetylated form is about 42 Da heavier |
| Residue count | 7 (heptapeptide) | Four residues from ACTH(4-10), three added |
| Appearance | White to off-white powder | Usually supplied lyophilized |
| Solubility class | Freely soluble in water | Also dissolves in DMSO and polar organic solvents |
| Related parent fragment | ACTH(4-10) | Parent motif is Met-Glu-His-Phe |
该化合物于二十世纪八十年代在俄罗斯被开发，相关工作由俄罗斯科学院分子遗传学研究所的研究团队主导。开发目标并非复制 ACTH 的完整激素活性，而是寻找保留其神经作用方向、同时去除促肾上腺皮质激素释放效应的短肽片段。研究记录显示，这一方向促成了多个相关短肽的合成与筛选，而 Semax 是其中被研究最广泛的一个。当地文献常以 Семакс 这一名称指代它。
研究兴趣主要集中在神经营养因子相关的路径上，包括脑源性神经营养因子与神经生长因子的表达变化。部分实验报告称在特定条件下观察到这些因子的水平上升，但具体信号通路和剂量依赖关系仍未完全厘清。多数公开数据来自细胞模型和动物实验，人体对照研究数量有限。因此，该化合物的作用机制在文献中属于活跃讨论，而非已经确立的定论。
Semax 是一种人工合成的七肽，氨基酸序列为 Met-Glu-His-Phe-Pro-Gly-Pro，单字母缩写记作 MEHFPGP。它被归类为促肾上腺皮质激素片段 ACTH(4-10) 的结构类似物，但并不天然存在于生物体内。母体片段 ACTH(4-10) 的序列为 Met-Glu-His-Phe-Arg-Trp-Gly，Semax 替换了中间两个残基，并在羧基端延长了 Pro-Gly-Pro 三肽。这种延长被普遍认为能提升分子对肽酶的耐受性。
Published research has focused mainly on neurological and cognitive endpoints in animal models, with proposed mechanisms involving brain-derived neurotrophic factor and related signalling pathways. A substantial share of the human data originates from a limited number of research groups, and independent replication in other countries remains sparse. Regulatory status reflects that distribution: the peptide is registered as a medicine in Russia and appears in some neighbouring markets, while elsewhere it is handled as a research chemical without approved therapeutic labelling. Questions about dose-response relationships, long-term effects, and comparability across studies are still open.
Lyophilised powder is normally kept at -20 °C in a desiccated container, with some suppliers recommending -80 °C for long-term archival storage. Repeated freeze-thaw cycles are the most common cause of avoidable loss, so aliquoting before freezing reduces variability between working sessions. Dissolved peptide is far less stable than the dry solid and is usually prepared fresh or held briefly at 4 °C. Aqueous solutions support both hydrolysis of the backbone and oxidation of the N-terminal methionine, and these two routes dominate degradation under ordinary laboratory conditions.
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.
Recent research involving MOFs as a drug delivery method includes more than just the encapsulation of everyday drugs like ibuprofen and aspirin. In early 2018 Chen et al., published detailing their work on the use of MOF, ZIF-8 (zeolitic imidazolate framework-8) in antitumor research "to control the release of an autophagy inhibitor, 3-methyladenine (3-MA), and prevent it from dissipating in a large quantity before reaching the target." The group performed in vitro studies and determined that "the autophagy-related proteins and autophagy flux in HeLa cells treated with 3-MA@ZIF-8 NPs show that the autophagosome formation is significantly blocked, which reveals that the pH-sensitive dissociation increases the efficiency of autophagy inhibition at the equivalent concentration of 3-MA." This shows promise for future research and applicability with MOFs as drug delivery methods in the fight against cancer.
=== Supreme Council of Colon === Cassard departed from New York City and arrived in the port of Santiago de Cuba in December 1859, personally despatched by Albert Pike. When he arrived in the city, he never left the ship. Since there was an active warrant for his arrest in Cuba, he was afraid that if he did disembark, he might have been taken into custody and executed. On December 27, 1859, in the cabin of his ship, Andrés Cassard established a Supreme Council of the Ancient and Accepted Scottish Rite, 33°, at the direction of the Supreme Council, 33°, Southern Jurisdiction. The first Grand Commander of the Supreme Council was Antonio Vinent y de Gola, V Marqués de Palomares del Duero, one of the wealthiest property owners in Oriente Province. He had earned the title of Marquis in the service of the government against the independence movement. In 1860, a rift started to form between the Grand Lodge of Colon and the Supreme Council of Colon. This rift between the Supreme Council and the Grand Lodge was about more than the ability to charter Lodges, it was deeply rooted in the different political ideologies between Protestants and Catholics. While Freemasons in the capitol in Havana maintained closer links to the United States, the Eastern city of Santiago de Cuba was much closer culturally to the Catholicism in the rest of Latin America. Being predominately Catholic landowners, the Supreme Council viewed the Grand Lodge as one filled with Protestantism and Anglo-Saxon ideas.
Excess matrix metalloproteinases, which are released by leukocytes, may also cause wounds to become chronic. MMPs break down ECM molecules, growth factors, and protease inhibitors, and thus increase degradation while reducing construction, throwing the delicate compromise between production and degradation out of balance.
Taking the first and last characters of each line as a single sentence, it reads "Go to hell Japan, Koizumi must die" (日本去死, 小泉定亡 Rìběn qù sǐ, Xiǎoquán dìng wáng). In Chinese literature, there is a long tradition of hiding sensitive messages, mostly political related ones, in the lines of a poem. These hidden messages can be seen by reading the poem horizontally, diagonally, clockwise or anti-clockwise. One famous example is a poem protesting against Chinese prime minister Li Peng, after the 1989 Tiananmen Square protests and massacre. The poem seemingly showed strong support for the communist-governed China, and was published by the People's Daily in 1991, but when read diagonally, it showed a slogan "Li Peng must resign to appease anger of the people", which embarrassed the Chinese government.
=== Oxidative stress === Numerous whole-exome sequencing studies have demonstrated that vitiligo is associated with polymorphisms in genes involved in the response to oxidative stress, supporting the association of elevated levels of reactive oxygen species in melanocytes with the induction of an autoimmune response. Thus, diseases presenting with altered mitochondrial function such as MELAS, Vogt–Koyanagi–Harada and Kabuki syndrome are associated with an increased risk of vitiligo. In line with these observations, genetic alterations in mitochondrial DNA (mtDNA) of melanocytes associated with altered mitochondrial function lead to a release of mtDNA that can be detected in the skin of vitiligo patients. This mtDNA can be sensed by the cGAS–STING pathway, resulting in pro-inflammatory cytokine and chemokine production promoting the recruitment of cytotoxic T cells.
Sources: en.wikipedia.org
== Prognosis == Most skin grafts are successful, but in some cases grafts do not heal well and may require repeat grafting. The graft should also be monitored for good circulation. Recovery time from skin grafting can be long. Graft recipients wear compression garments for several months and are at risk for depression and anxiety consequent to long-term pain and loss of function.
== Chemistry == This colorless, water-soluble solid is a derivative of pyridine, with a carboxyl group (COOH) at the 3-position. Other forms of vitamin B3 include the corresponding amide nicotinamide, where the carboxyl group has been replaced by a carboxamide group (CONH2).
Some followers of Islam, or Muslims, chose to be vegetarian for health, ethical, or personal reasons. However, the choice to become vegetarian for non-medical reasons can sometimes be controversial due to conflicting fatwas and differing interpretations of the Quran. Though some more traditional Muslims may keep quiet about their vegetarian diet, the number of vegetarian Muslims is increasing. Sri Lankan Sufi master Bawa Muhaiyaddeen, who established The Bawa Muhaiyaddeen Fellowship of North America in Philadelphia. The former Indian president Dr. A. P. J. Abdul Kalam was also famously a vegetarian. In January 1996, The International Vegetarian Union announced the formation of the Muslim Vegetarian/Vegan Society. Many non-vegetarian Muslims will select vegetarian (or seafood) options when dining in non-halal restaurants. However, this is a matter of not having the right kind of meat rather than preferring not to eat meat on the whole.
== History == Ken and Linda Rosenthal founded the St. Louis Bread Company in 1987 after Ken visited sourdough bakery-café La Boulanger in San Francisco at the insistence of his brother. After being fascinated with the process of sourdough making, he was trained to make sourdough under instruction of the owner, Roger Brunello for a year. The first location was opened in Kirkwood, Missouri. The Rosenthals invested $150,000 and received a $150,000 Small Business Administration loan. Au Bon Pain Co., a public company, purchased the St. Louis Bread Company in 1993 for $23 million. In 1997, Au Bon Pain changed the company name to Panera, from a word that has roots in the Latin word for "breadbasket" (Classical pānārium, Vulgar pānāria) and is identical to the word for "breadbasket" in Spanish and Catalan. The original name was retained for locations in Missouri. At the same time, the St. Louis Bread Company renovated its 20 bakery-cafes in the St. Louis area. In May 1999, Au Bon Pain Co. sold the Au Bon Pain chain to the firm Bruckmann, Rosser, Sherrill & Co. for $78 million to focus on the Panera Bread chain. In 2000, Panera Bread moved its headquarters to Richmond Heights, Missouri. In 2007, Panera Bread purchased a 51% stake in Paradise Bakery & Café, a Phoenix metropolitan area-based concept with over 70 locations in 10 states, predominantly in the West and Southwest, for $21.1 million. The company purchased the balance of Paradise in June 2009.
Sources: en.wikipedia.org
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.
Semax is a synthetic analog of the ACTH(4-10) fragment rather than a copy of the full hormone. Truncation plus the added tail removes the steroidogenic portion of ACTH. That distinction explains why it is studied for nervous-system effects instead of adrenal stimulation.
It is registered as a prescription product in Russia and has been used there clinically, chiefly by the intranasal route. No approval exists in the United States or the European Union. Availability elsewhere typically falls under research-chemical distribution, with varying purity documentation.
电喷雾或基质辅助激光解吸电离质谱是常用手段，测得的质子化离子质荷比可换算为分子量。结果与理论值落在合理误差内，才支持结构一致的判断。