nasal formulation comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Updated 2026-07-30. Numbers and descriptions here follow the published literature rather than marketing material.
Quality documentation for research-grade peptide usually includes a certificate of analysis stating purity, identity, and residual counterion content. Batch-to-batch variation in purity and salt form is a recognized issue, and comparisons across suppliers require attention to the exact counterion, for example acetate versus trifluoroacetate. Sequence verification by tandem mass spectrometry provides stronger evidence than a single mass measurement. For any study reporting biological results, the analytical method and the measured purity should be stated explicitly. Independent verification of supplier claims is considered good practice.
Semax is supplied as a lyophilized powder that appears white to off-white. It dissolves readily in water, phosphate-buffered saline, and other aqueous media, which simplifies preparation of working solutions for laboratory use. The nasal products registered in Russia are dilute aqueous solutions, typically around 0.1 percent peptide by weight. Organic solvents are rarely necessary and can complicate handling. Because the peptide is hygroscopic, weighing should be performed quickly and with minimal exposure to ambient humidity.
Solid material is normally kept at minus 20 degrees Celsius in a sealed, desiccated container. Reconstituted solutions are less stable and are usually divided into single-use aliquots before freezing. Repeated freeze-thaw cycles are avoided because they promote aggregation and loss of activity. Light exposure is minimized by using amber glassware or foil wrapping. Published stability data for this peptide are sparse, so recommended storage conditions rest mainly on general practice for short synthetic peptides rather than on dedicated study.
Development took place during the 1980s at institutes of the Russian Academy of Sciences, where peptide fragments of ACTH were screened for cognitive and neuroprotective effects. The compound received regulatory approval in Russia as a nasal preparation, marketed for conditions such as ischemic stroke, transient ischemic attacks, and optic nerve disorders. Registration in other countries has not followed. Most published clinical reports originate from a small number of Russian research groups, and independent replication outside that setting remains limited. The regulatory status therefore differs sharply between Russia and the rest of the world.
Laboratory work points toward modulation of neurotrophic signaling, particularly expression of brain-derived neurotrophic factor and nerve growth factor in hippocampal tissue. Studies also describe effects on monoamine turnover, inflammatory mediators, and oxidative markers. These observations come mainly from animal models and cultured cells, so the causal chain in humans is not firmly established. Whether the reported molecular changes translate into measurable clinical benefit is an open question. Reviews generally present the mechanism as plausible rather than demonstrated.
| Property | Value | Notes |
|---|---|---|
| Typical purity | ≥95% by HPLC | Research-grade material |
| Detection wavelength | 214 nm | Peptide bond absorbance |
| Reconstitution medium | Sterile water or saline | Prepare fresh or aliquot immediately |
| Storage (solution) | -80 °C, single-use aliquots | Avoid repeated freeze-thaw cycles |
| Common salt form | Acetate or trifluoroacetate | Affects mass and solubility |
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.
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.
The parent fragment ACTH(4-10) carries the sequence Met-Glu-His-Phe-Arg-Trp-Gly. Semax replaces the arginine and tryptophan positions with a proline-glycine-proline tail, giving Met-Glu-His-Phe-Pro-Gly-Pro. That change removes residues associated with adrenal stimulation, so the peptide does not drive cortisol release the way full ACTH does. This distinction shapes how the compound is grouped in the literature, where it sits with neuropeptides and peptide neuromodulators rather than with corticosteroids.
Regulatory status varies sharply by country. Semax is registered for medical use in Russia, where it appears in formularies as a nasal solution, and it also holds registration in a small number of neighbouring states. It has no approval from the United States Food and Drug Administration or the European Medicines Agency, and it is not a scheduled controlled substance in most jurisdictions. Elsewhere it circulates mainly as laboratory material, so purity documentation comes from suppliers rather than from a national pharmacopoeia.
Semax is a synthetic peptide created in the Soviet Union during the early 1980s by researchers working in Moscow. It was built from the short adrenocorticotropic hormone fragment known as ACTH(4-10), and the chain was then extended with three additional amino acids. The resulting molecule was named semax and entered clinical use in Russia in 1994. It is generally described as a nootropic and neuroprotective agent rather than as a hormone analogue.
Evidence of intentional pyre cremation at the HOR-1 site (Malawi) approximately 9500 years before present, representing the oldest adult pyre cremation in the world reported to date, is presented by Cerezo-Román et al. (2026). Chritz et al. (2026) reconstruct the subsistence of foragers and herders from eastern Africa living from 9500 to 230 years before present on the basis of isotopic values of their tooth enamel and bone collagen, reporting evidence dietary diversity in fisher-foragers and in earliest pastoralists from the Turkana Basin (Kenya), and evidence that specialized pastoralist diets happened approximately 1000 years after the introduction of domestic livestock. Martin et al. (2026) reconstruct the human population history in northeastern Africa on the basis of the study of the morphology of bony labyrinths of Late Pleistocene and Holocene individuals, reporting evidence of overall biological discontinuity between foragers and Neolithic food producers in the Middle Nile Valley, but also evidence of limited, localized instances of admixture or continuity between the two groups. Surovell et al. (2026) provide new information on the age of the purported pre-Clovis site Monte Verde II (Chile), and argue that the site cannot be older than the middle Holocene. The first molecular evidence of HPV16 in ancient anatomically modern humans is reported from the study of ancient DNA of the Ust'-Ishim man and Ötzi by Yazigi et al. (2026). Balzeau et al.
After surgery, a woman is instructed to restrict her activities and monitor herself for signs of infection such as an elevated temperature, discharge with a foul odor, and consistent pain. Clinicians may recommend that sneezing, coughing, and constipation be avoided. Splinting the abdomen while coughing supports an incised area and decreases pain with coughing. This is accomplished by applying gentle pressure to the surgical site for bracing during a cough. Recurrent surgery on the pelvic organs may not be due to a failure of the surgery to correct the cystocele. Subsequent surgeries can be directly or indirectly related to the primary surgery. Prolapse can occur at a different site in the vagina. Further surgery after the initial repair can be to treat complications of mesh displacement, pain, or bleeding. Additional surgery may be needed to treat incontinence. One goal of surgical treatment is to restore the vagina and other pelvic organs to their anatomically normal positions. This may not be the most important outcome to the treated woman, who may only want symptom relief and to improve her quality of life. The International Urogynecological Association (IUGA) has recommended that the data collected regarding cystocele and pelvic organ repair success include the presence or absence of symptoms, satisfaction, and Quality of Life. Other measures of a successful outcome should include perioperative data, such as operative time and hospital stay. Standardized Healthcare Quality of Life should be part of the measure of a successful resolution of cystocele.
=== Guanidinium cation === The conjugate acid is called the guanidinium cation, (C(NH2)+3). This planar, symmetric ion consists of three amino groups each bonded to the central carbon atom with a covalent bond of order 4/3. It is a highly stable +1 cation in aqueous solution due to the efficient resonance stabilization of the charge and efficient solvation by water molecules. As a result, its pKa is 13.6 (pKb of 0.4) meaning that guanidine is a very strong base in water; in neutral water, it exists almost exclusively as guanidinium. Due to this, most guanidine derivatives are salts containing the conjugate acid.
The three substrates of this enzyme are N5-(L-1-carboxyethyl)-L-ornithine, oxidised nicotinamide adenine dinucleotide phosphate (NADP+), and water. Its products are L-ornithine, reduced NADPH, pyruvic acid, and a proton.
In lichenology, simple chemical spot tests are used to detect certain compounds in situ, and X. parietina yields clear results due to its anthraquinone pigments. A standard test is the K test (using potassium hydroxide solution). On X. parietina, applying KOH to the cortex produces a deep purple reaction (K+ purple). This is a classic indication of anthraquinones like parietin – the KOH causes parietin to form a purple salt (a distinctive color change). Other spot test results for this lichen are negative: C−, KC−, and P−. In addition to its anthraquinone pigments, Xanthoria parietina contains small amounts of calcium oxalate, a secondary metabolite that occurs in many lichens, particularly those growing on calcareous substrates. However, unlike strictly calcicolous species such as Caloplaca heppiana and Lecanora calcarea, which accumulate large quantities of calcium oxalate, X. parietina was found to contain only minor traces of this compound. This suggests that while X. parietina can tolerate limestone habitats, it does not rely on extensive oxalate production for calcium regulation or substrate modification to the same extent as obligate calcicoles.
Sources: en.wikipedia.org
==== Metabolism ==== Pseudoephedrine is not extensively metabolized and is subjected to minimal first-pass metabolism with oral administration. Due to its methyl group at the α carbon (i.e., it is an amphetamine), pseudoephedrine is not a substrate for monoamine oxidase (MAO) and is not metabolized by this enzyme. It is also not metabolized by catechol O-methyltransferase (COMT). Pseudoephedrine is demethylated into the metabolite norpseudoephedrine to a small extent. Similarly to pseudoephedrine, this metabolite is active and shows amphetamine-like effects. Approximately 1 to 6% of pseudoephedrine is metabolized in the liver via N-demethylation to form norpseudoephedrine.
==== 20th century ==== In response to concerns about the risks of occupational polonium exposure, quantities of 210Po were administered to five human volunteers at the University of Rochester from 1944 to 1947, in order to study its biological behaviour. These studies were funded by the Manhattan Project and the AEC. Four men and a woman participated, all suffering from terminal cancers, and ranged in age from their early thirties to early forties; all were chosen because experimenters wanted subjects who had not been exposed to polonium either through work or accident. 210Po was injected into four hospitalised patients, and orally given to a fifth. None of the administered doses (all ranging from 0.17 to 0.30 μCi kg−1) approached fatal quantities. The first documented death directly resulting from polonium poisoning occurred in the Soviet Union, on 10 July 1954. An unidentified 41-year-old man presented for medical treatment on 29 June, with severe vomiting and fever; the previous day, he had been working for five hours in an area in which, unknown to him, a capsule containing 210Po had depressurised and begun to disperse in aerosol form. Over this period, his total intake of airborne 210Po was estimated at 0.11 GBq (almost 25 times the estimated LD50 by inhalation of 4.5 MBq). Despite treatment, his condition continued to worsen and he died 13 days after the exposure event. From 1955 to 1957 the Windscale Piles had been releasing polonium-210.
Masculinizing hormone therapy is typically used by transgender men, who desire the development of masculine secondary sex characteristics. Masculinizing hormone therapy usually includes testosterone to produce masculinization and suppress the production of estrogen. Treatment options include oral, subcutaneous injections or implant, and transdermal (patches, gels). Dosing is patient-specific, depending on the patient's rate of metabolism, and is discussed with the physician. The most commonly prescribed methods are intramuscular and subcutaneous injections. This dosing can be daily, weekly or biweekly depending on the route of administration and the individual patient. Unlike feminizing hormone therapy, individuals undergoing masculinizing hormone therapy do not usually require additional hormone suppression such as estrogen suppression. Therapeutic doses of testosterone are usually sufficient to inhibit the production of estrogen to desired physiologic levels. The desired effects of masculinizing hormone therapy focus on the development of masculine secondary sex characteristics. These desired effects include: increased muscle mass, increased bone turnover, development of facial hair, voice deepening, increase and thickening of body hair, and more.
Negros, like the Central Philippines (Visayas) overall, is generally recognized as a top priority area for wildlife conservation, both in terms of numbers of endemic species and severity of threat. More than half of the critically endangered species listed in the Philippines occur in Negros. It is the most threatened area of the Philippines, since it has the least remaining forest cover with just an estimated 3% remaining. It has the highest numbers of severely threatened endemic species and subspecies. Mt. Silay and Mt. Mandalagan are the two mountain peaks in the Northern Negros Natural Park. These mountains have the last remaining old-growth forests. Negros shares a lot of its fauna with Panay. Due to high amounts of deforestation most of these Western Visayan endemics are threatened. These include the white-winged cuckooshrike, Visayan flowerpecker, flame-templed babbler, writhed-billed hornbill, Visayan tarictic hornbill, Negros bleeding-heart pigeon, Visayan rhabdornis, Negros scops owl, Visayan spotted deer and Visayan warty pig The Negros striped babbler and the possibly extinct Negros fruit dove are only found on the island and nowhere else. Other threatened species include Blue-backed parrot, Pinsker's hawk-eagle, Pink-bellied imperial pigeon, Green-faced parrotfinch and the possibly extinct subspecies of Celestial monarch and Spotted imperial pigeon.
==== Rapid expansion ==== By the end of 1858 there were already eight firms producing aniline dyes. By 1861 there were twenty-nine British patents on coloring matters from aniline. By 1864 68 firms were producing dyes. This was driven by the textile industry, which employed new designs requiring the colorful aniline dyes. Even Hofmann, who had at first criticized his student for leaving his academic research of quinine, later synthesized his own aniline dye, rosaniline. In 1858 the German chemist Johann Peter Griess obtained a yellow dye by reacting nitrous acid with aniline. It didn't last commercially, but it created even more interest in aniline as precursor for colorful compounds. French chemist François-Emmanuel Verguin reacted aniline with stannic chloride to yield fuchsine, a rose colored dye, the first of the triphenylmethane dyes. Further work by Hoffman along with the discovery of benzene’s structure (1858) and carbon’s tetravalency(1865), this science built the groundwork for modern organic chemistry. In the late 1860s many companies began offering a full spectrum of colors, and were already outcompeting many natural dyes for market share. Prices continually fell, and new colors and products regularly entered the market. On January 1, 1868, there were 52 producers of aniline dyes. Members of enlightened scientific societies from all over Europe including the Manchester Literary & Philosophical Society competed for expertise and authority with dyers and printers in factories and workshops.
Sources: en.wikipedia.org
Solid peptide is best kept frozen at about minus 20 degrees Celsius in a sealed container with desiccant. It should be allowed to reach room temperature before opening to prevent condensation. Repeated warming and cooling of the same vial is discouraged.
Reversed-phase liquid chromatography establishes purity, while mass spectrometry confirms molecular mass. The two techniques are normally used together. Retention time alone is not sufficient evidence of identity.
Different counterions change the mass per unit of peptide and can shift chromatographic behavior. Two samples of equal stated purity may therefore not be directly comparable. Reports should specify the counterion whenever quantitative comparisons are made.
Semax is a synthetic seven-amino-acid peptide derived from a fragment of corticotropin. It is used in Russia as a nasal preparation, while elsewhere it is studied as a research compound. It is not approved as a medicine in most countries.