If you have been reading about counter-ion and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Updated 2026-05-02. Numbers and descriptions here follow the published literature rather than marketing material.
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。
Published studies examine a fairly narrow set of endpoints. Rodent experiments commonly measure maze learning, infarct volume after induced ischemia, and tissue levels of neurotrophic factors. Clinical reports from Russian centres describe attention, memory and recovery scores in patients after stroke or transient ischemic attack. Most of those human studies are small and few have been repeated by independent groups. Outcome measures differ between studies, which limits direct comparison.
Circulation time for the peptide is short because peptidases cleave it readily. The Pro-Gly-Pro tail is thought to slow breakdown compared with the bare ACTH fragment, but the gain appears modest. Absorption after intranasal dosing is limited, and only a fraction of a dose is expected to reach the central nervous system. Laboratory concentrations therefore sit well above levels achieved systemically, a gap that complicates translation from bench findings to clinical claims.
| Property | Value | Notes |
|---|---|---|
| 分子式 | C37H51N9O10S | 游离碱形式 |
| 等电点 | 约 6.5 | 估算值，随缓冲体系变化 |
| 主要降解途径 | 水解与氧化 | 侧链氧化最为常见 |
| 溶液储存 | 2 至 8 摄氏度避光 | 避免反复冻融 |
| 常规分析手段 | 反相色谱与质谱联用 | 氨基酸分析辅助核对 |
Lyophilized material is chemically stable for extended periods when kept dry, cold, and protected from light. The powder is hygroscopic, so vials should be warmed to room temperature before opening to reduce condensation on the contents. Once dissolved, the peptide is far less stable because peptide bonds are susceptible to hydrolysis and the methionine residue can oxidize. Solutions are typically aliquoted and held at 2-8 °C for short intervals or frozen for longer ones, and repeated freeze-thaw cycles should be avoided.
Routine characterization relies on reversed-phase high-performance liquid chromatography to establish purity and on mass spectrometry to confirm molecular identity. Electrospray ionization and matrix-assisted laser desorption ionization are both used for mass verification. Amino acid analysis and peptide mapping can detect sequence errors. Common impurities include truncated sequences, methionine sulfoxide formed by oxidation, and deamidated products. Chromatograms are usually recorded near 214 nm, where the peptide backbone absorbs, and purity is reported as the percentage area of the principal peak.
Verification of a supplied batch generally combines a certificate of analysis with independent testing, because certificates are self-reported documents. A typical package includes a chromatographic trace, a mass spectrum, and a stated water or counter-ion content. Batch-to-batch consistency matters more than a single purity figure when results are compared across experiments. No single mandatory standard governs research-grade peptide release, so laboratories are expected to define their own acceptance criteria. Residual trifluoroacetate from purification is a frequently overlooked counter-ion.
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。
=== Liver === As a meal containing carbohydrates or protein is eaten and digested, blood glucose levels rise, and the pancreas secretes insulin. Blood glucose from the portal vein enters liver cells (hepatocytes). Insulin acts on the hepatocytes to stimulate the action of several enzymes, including glycogen synthase. Glucose molecules are added to the chains of glycogen as long as both insulin and glucose remain plentiful. In this postprandial or "fed" state, the liver takes in more glucose from the blood than it releases. After a meal has been digested and glucose levels begin to fall, insulin secretion is reduced, and glycogen synthesis stops. When it is needed for energy, glycogen is broken down and converted again to glucose. Glycogen phosphorylase is the primary enzyme of glycogen breakdown. For the next 8–12 hours, glucose derived from liver glycogen is the primary source of blood glucose used by the rest of the body for fuel. Glucagon, another hormone produced by the pancreas, in many respects serves as a countersignal to insulin. In response to insulin levels being below normal (when blood levels of glucose begin to fall below the normal range), glucagon is secreted in increasing amounts and stimulates both glycogenolysis (the breakdown of glycogen) and gluconeogenesis (the production of glucose from other sources).
=== Infectious diseases === Among the human-specific infectious pathogens studied on humanized mice models, the human immunodeficiency virus has been successfully studied. Besides this, humanized models for studying Ebola virus, Hepatitis B, Hepatitis C, Kaposi's sarcoma-associated herpesvirus, Leishmania major, malaria, and tuberculosis have been reported by various studies. NOD/scid mice models for dengue virus and varicella-zoster virus, and a Rag2null𝛾cnull model for studying influenza virus have also been developed.
organic fertilizers are highly variable in their nutritional compositions in terms of minerals and different organic and inorganic species. Even similar materials can differ significantly based on their source (e.g. the quality of manure varies based on an animal's diet). organic fertilizers are often sourced from animal byproducts, making disease transmission a serious concern for plants grown for human consumption or animal forage. organic fertilizers are often particulate, contain environmental pollutants, and can clog substrates or other growing equipment. Sieving or milling the organic materials to fine dusts is often necessary. biochemical degradation and conversion processes of complex organic materials can make their mineral ingredients available to plants. some organic materials (i.e. particularly manures and offal) can further degrade to emit foul odors under anaerobic conditions or emit nanoparticles. many organic molecules (i.e. sugars) demand additional oxygen during aerobic degradation, which is essential for cellular respiration in the plant roots. organic compounds (i.e. sugars, vitamins, a.o.) are not necessary for normal plant nutrition. Nevertheless, if precautions are taken, organic fertilizers can be used successfully in hydroponics.
In November 1979, the federal government informed the Bundestag that the West German public broadcasters ARD and ZDF had agreed to refuse to use the initialism. The ISO 3166-1 alpha-2 country code of West Germany was DE (for Deutschland, Germany), which has remained the country code of Germany after reunification. ISO 3166-1 alpha-2 codes are the most widely used country codes, and the DE code is notably used as a country identifier, extending the postal code and as the Internet's country code top-level domain .de. The less widely used ISO 3166-1 alpha-3 country code of West Germany was DEU, which has remained the country code of reunified Germany. The now deleted codes for East Germany, on the other hand, were DD in ISO 3166-1 alpha-2 and DDR in ISO 3166-1 alpha-3. The colloquial term West Germany or its equivalent was used in many languages. Westdeutschland was also a widespread colloquial form used in German-speaking countries, usually without political overtones.
Sources: en.wikipedia.org
=== Other conditions === LSD has been studied for the relief of pain and headaches. It has been used as a treatment for cluster headaches with positive results in some small studies. The drug might have analgesic properties related to pain in terminally ill patients and phantom pain and might be useful for treating inflammatory diseases such as rheumatoid arthritis due to anti-inflammatory effects.
=== Modern times === The university hired its first African-American faculty member, Vivian Cox, in 1967. Three professors were murdered at the school in a shooting in 2002. The perpetrator, who then shot himself, was a student who had failed out of the school. He mailed a 22-page letter to the Arizona Daily Star announcing his reasons, naming two of the killed professors in the letter; following the shooting, the Daily Star made the controversial decision to publish the letter. On April 17, 2020, the University of Arizona announced temporary pay cuts and furloughs to its 15,000 employees as its Tucson campus shut down due to the COVID-19 pandemic. All employees making up to $150,000 per year were furloughed, with the length determined by each employees' salary. For employees making more than $150,000 per year, pay cuts of 17% or 20% were instituted. Also in 2020, the University of Arizona announced it had purchased Ashford University from Zovio and renamed it The University of Arizona Global Campus. The purchase was heavily criticized, particularly by University of Arizona faculty members. As Ashford was being purchased by the University of Arizona, it was the subject of an investigation by the Attorney General of Massachusetts, a lawsuit from the Attorney General of California, and a formal notification of concern from the university's accreditor. A university professor was murdered on campus in October 2022, by a former student. Following the crime, the university commissioned an independent investigation of campus safety.
== Medical uses == Chlorprothixene's principal indications are the treatment of psychotic disorders (e.g. schizophrenia) and of acute mania occurring as part of bipolar disorders. Other uses are pre- and postoperative states with anxiety and insomnia, severe nausea / emesis (in hospitalized patients), the amelioration of anxiety and agitation due to use of selective serotonin reuptake inhibitors for depression and, off-label, the amelioration of alcohol and opioid withdrawal. It may also be used cautiously to treat nonpsychotic irritability, aggression, and insomnia in pediatric patients. An intrinsic antidepressant effect of chlorprothixene has been discussed, but not proven. Likewise, it is unclear if chlorprothixene has genuine (intrinsic) analgesic effects. However, chlorprothixene can be used as co-medication in severe chronic pain. Also, like most antipsychotics, chlorprothixene has antiemetic effects.
Sources: en.wikipedia.org
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。
甲硫氨酸侧链含硫醚，在氧气、光照或金属离子存在时容易被氧化。氧化产物极性略增，常在色谱图上表现为主峰之前的肩峰或前伸峰。
通常建议冷藏避光，并在较短时间内使用。不存在适用于所有配方的统一期限，具体取决于浓度、缓冲体系与容器材质。
It consists mainly of animal experiments and small clinical reports, with much of the clinical material published in Russian-language journals. Large independent trials are scarce. Separating reliable effects from chance findings is consequently difficult.