Everything below concerns single-use aliquot. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2025-09-29. Where a claim depends on a specific study, the study is described rather than over-claimed.
Once dissolved, the peptide is considerably less stable than the solid. Aqueous solutions are usually prepared at neutral to slightly acidic pH, filtered, and divided into single-use aliquots before freezing. Repeated freeze-thaw cycles are a common cause of avoidable loss and are best prevented by never refreezing a thawed aliquot. Adsorption to plastic and glass surfaces can lower the measured concentration of dilute solutions, particularly below roughly 0.1 mg/mL. Buffer choice, salt content, and container material all influence how much peptide remains detectable after storage.
Identity and purity are established with standard peptide methods. Reversed-phase HPLC with ultraviolet detection near 214 nm resolves the parent peak from deletion and truncation byproducts, and reports typically quote a main-peak percentage. Mass spectrometry by electrospray or MALDI-TOF confirms the expected molecular mass, while amino acid analysis or peptide mapping can verify composition when the sequence itself is in question. A certificate of analysis that pairs a chromatogram with a mass spectrum is more informative than a purity figure alone. Counter-ion content and residual solvents are separate specifications and are frequently omitted.
The mechanisms attributed to semax are inferred from animal and cell studies rather than traced to one confirmed target. The most frequently cited pathway involves increased expression of brain-derived neurotrophic factor and nerve growth factor in hippocampal and cortical tissue. Some work points to engagement of melanocortin receptors, particularly MC4, which the parent ACTH fragment can activate. Effects on dopaminergic and serotonergic signalling have also been reported. No single account explains all observed results, and the relative weight of each pathway remains unsettled.
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.
| Property | Value | Notes |
|---|---|---|
| Solid storage temperature | -20 °C or below | Desiccated and protected from light |
| Solution storage temperature | -80 °C as single-use aliquots | Avoid repeated freeze-thaw cycles |
| Purity assessment method | RP-HPLC, around 214 nm | Reported as main-peak area percent |
| Identity confirmation method | ESI-MS or MALDI-TOF | Measured mass compared with calculated mass |
| Common synonyms | ACTH(4-10) analog; Met-Glu-His-Phe-Pro-Gly-Pro | Also written as Semaxum in some sources |
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.
Practical handling follows from those properties. Bulk material is best divided into single-use portions soon after receipt, because each thaw exposes the whole container to moisture and temperature cycling. Vials should be allowed to reach room temperature before opening to prevent condensation on the powder. Low-binding plasticware reduces loss of dilute solutions, and sterile filtration is used when a preparation must remain free of microbial growth. Records of batch number, reconstitution date and storage history are what allow a later analytical result to be interpreted meaningfully.
Identity and purity of Semax are established mainly by reversed-phase high-performance liquid chromatography coupled with mass spectrometry. The chromatographic trace gives a purity estimate as a percentage of total peak area, while electrospray or matrix-assisted laser desorption ionization confirms the molecular mass against the calculated value. Amino acid analysis and sequence-specific fragmentation provide further confirmation when a supplier's chain of custody is unclear. Vendors frequently quote a purity figure without stating the detection wavelength or the integration method, which limits how far one number can be compared with another.
Stability depends heavily on physical state. Lyophilized powder held dry, cold and dark retains its content over long periods, whereas dissolved peptide begins to change within days at room temperature. The most cited degradation route is oxidation of the methionine residue, which converts the peptide to a sulfoxide form that elutes differently on chromatography. Hydrolysis of amide bonds and adsorption onto container walls contribute smaller losses. Buffers that exclude oxygen from the headspace slow the oxidation pathway, but no single condition prevents all change indefinitely.
A number of factors, including diet, obesity, and exercise, affect the level of deoxycholate in the human colon. When humans were switched from their usual diet to a meat, egg and cheese based diet for five days, deoxycholate in their feces increased by factors of 2 to 10 fold. Rats fed diets with 30% beef tallow (high fat) had almost 2-fold more deoxycholate in their feces than rats fed 5% beef tallow (low fat). In the same study, adding the further dietary elements of curcumin or caffeic acid to the rats' high fat (30% beef tallow) diet reduced the deoxycholate in their feces to levels comparable to levels seen in the rats on a low fat diet. Curcumin is a component of the spice turmeric, and caffeic acid is a component high in some fruits and spices. Caffeic acid is also a digestive break-down product of chlorogenic acid, high in coffee and some fruits and vegetables. In addition to fats, the type or amount of protein in the diet may also affect bile acid levels. Switching from a diet with protein provided by casein to a diet with protein provided by salmon protein hydrolysate led to as much as a 6-fold increase in levels of bile acids in the blood plasma of rats. In humans, adding high protein to a high fat diet raised the level of deoxycholate in the plasma by almost 50%. Obesity has been linked to cancer, and this link is in part through deoxycholate.
==== Treatment ==== Food should be offered at the first signs of possible hypoglycemia. If the animal refuses it, a sugar solution (corn syrup, honey, pancake syrup, etc.) should be poured on the finger and rubbed on its gums or under the tongue (sublingually). The solution must be applied this way to prevent possible aspiration of it. Intervet suggests one tablespoon of a sugar solution rubbed onto the gums, regardless of the size of the dog. Another hypoglycemia formula is 1 gram of glucose for every kilogram (2.2 lb) of the animal's body weight. Since sugar acts quickly, a response should be seen within a minute or two. Honey, syrup, or sugar, as simple carbohydrates, act rapidly and will make the blood glucose rise, but the rise will not last very long, as they are broken down quickly by the body. Feeding something containing complex carbohydrates when the pet is able to eat will make sure another hypoglycemia event does not overtake the rapid rise in blood glucose levels from the sugar solution. Complex carbohydrates take longer to be broken down by the body, so they do not raise blood glucose levels until some time after being eaten. A small meal should be fed and the animal taken for medical evaluation to determine if further treatment is needed. Treatment of a serious hypoglycemia episode is similar to that of diabetic humans: using glucose or glucagon infusions, depending on severity. A part from the medicinal way, lifestyle management of the dog can also be considered when preventing a diabetes attack on the dog.
=== Communes of the former Seine department === The destruction caused by the Commune affected not only the originals stored at the annex of the Hôtel de Ville, located at 4 Avenue Victoria, but also the duplicates from the Greffe collection, which were destroyed in the fire at the Palais de Justice on May 24, 1871. The disaster obliterated most of the parish registers (pre-1793) and civil status records (1793–1859) from the communes of the former Seine department. The situation varies depending on how these areas were incorporated into Paris in 1860:
Sources: en.wikipedia.org
== External links == Homepage of the Mann department at the MPI of Biochemistry Nature article about the Novo Nordisk Foundation Center for Protein Research Denmark launches big push for protein power
== Medical uses == Subcutaneous and intramuscular injections are generally more effective than the nasal spray and can be self-administered by patients. Intravenous injection is considered very effective for severe migraine or status migrainosus. Dihydroergotamine is also used in the treatment of medication overuse headache. Dihydroergotamine is indicated for the acute treatment of migraine.
== Career == Butler began as an instructor of medicine at Yale University (1994–1995) and later served as assistant professor at Vanderbilt University (1999–2006), where he was medical director of both the Heart Transplant and heart-lung transplant programs. In 2007, he joined Emory University as a full professor of medicine and director of the Heart Failure Research Program. At Stony Brook University, Butler served as Director of Cardiovascular Medicine and co-director of the Heart Institute (2014–2017), where he held the Charles A. Gargano Chair in Cardiology. From 2018 to 2022, he chaired the Department of Medicine at the University of Mississippi Medical Center, where he was also a professor of Physiology and Biophysics and held the Patrick H. Lehan Chair in Cardiovascular Research. Butler has combined clinical work with research, education, and leadership, directing heart failure and transplant programs at Vanderbilt and Tennessee Valley Healthcare systems. He served as Deputy Chief Science Officer for the American Heart Association (AHA) from 2009 to 2016. He has chaired committees for the Heart Failure Society of America and the American College of Cardiology, and represented the U.S. on the European Society of Cardiology Heart Failure Guidelines panel. Butler is a Fellow of the AHA, ACC, HFSA, and ESC. Butler chairs the U.S. Food and Drug Administration's Cardio-Renal Advisory Committee, co-chairs the NIH-funded HeartShare study on heart failure progression, and serves as principal investigator for several international cardiovascular trials.
=== Natural occurrence === Hawthorn flowers have a heavy, complicated scent, the distinctive part of which is triethylamine, which is also one of the first chemicals produced by a dead human body when it begins to decay. Due to the scent, it is considered unlucky in British culture to bring hawthorn into a house. Gangrene and semen are also said to possess a similar odour.
Sources: en.wikipedia.org
Each freeze-thaw cycle can degrade a fraction of the peptide and promote aggregation. Dividing a stock solution into single-use volumes removes repeated cycling as a variable. It also limits the time a thawed solution spends at room temperature.
A high main-peak percentage says little about identity, counter-ion content, or residual solvents. It also does not distinguish an isomer or a closely eluting analog. Mass confirmation and the accompanying documentation cover those gaps.
Salt form changes mass, solubility, and hygroscopicity, and acetate and trifluoroacetate salts behave differently in solution. Storage guidance still centers on -20 °C for powder and lower temperatures for solutions. The certificate should state which salt is present.
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.