Everything below concerns lyophilised powder. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-07-30. Where a claim depends on a specific study, the study is described rather than over-claimed.
Reversed-phase high-performance liquid chromatography is the routine method for purity assessment. Peptides absorb near 214 nm because of the peptide bond, and a gradient of acetonitrile in water separates the intact peptide from deletion sequences, oxidised products, and earlier-eluting fragments at neutral pH. Electrospray ionisation mass spectrometry provides an orthogonal check: the measured mass must agree with the theoretical value. Amino acid analysis and peptide mapping confirm structure but are used less often. Reference standards remain scarce because the peptide is not described in any pharmacopoeia.
Regulatory treatment varies by country. In the United States the peptide is not approved as a medicine, and products offered for human use may be treated as unapproved new drugs; some states also restrict sale. Australia, the United Kingdom, and European Union member states apply comparable restrictions to unapproved peptide products. Border agencies have seized shipments labelled as research chemicals. Classification may change over time, and the legal position for personal importation is not clearly settled in most published guidance.
Research interest has centred on photoprotection and pigmentation, with a smaller body of work on appetite and sexual function. Published human data remain limited to small, frequently uncontrolled studies, and the compound has never received marketing approval from a national medicines regulator. Most laboratory work treats it as a pharmacological tool for probing melanocortin signalling in cell culture or animal models. Whether pigmentation changes observed in people translate into measurable protection against ultraviolet-induced DNA damage remains an open question.
Melanotan-2 is a synthetic cyclic heptapeptide designed as an analogue of alpha-melanocyte-stimulating hormone, the naturally occurring peptide involved in pigmentation signalling. Its sequence is conventionally written as Ac-Nle-cyclo[Asp-His-D-Phe-Arg-Trp-Lys]-NH2, with a lactam bridge joining the aspartate side chain to the lysine side chain. The empirical formula is C50H69N15O9 and the monoisotopic mass lies near 1023.5 daltons. N-terminal acetylation and the D-configured phenylalanine both increase resistance to enzymatic breakdown compared with the parent hormone.
Pharmacologically, melanotan-2 behaves as a non-selective agonist across the melanocortin receptor family. Binding at MC1R on dermal melanocytes promotes eumelanin synthesis, which underlies the tanning response described in early human work. Activity at the centrally expressed MC4R receptor is associated with reported effects on appetite and erectile function. Because the peptide does not discriminate strongly among receptor subtypes, attributing any single observed effect to one receptor pathway is generally not possible without selective antagonists or receptor knockout models.
| Property | Value | Notes |
|---|---|---|
| Lyophilised storage | −20 °C, dry, protected from light | Vials are sealed and allowed to reach room temperature before opening |
| Reconstituted storage | 2 to 8 °C, protected from light | Short-term holding; avoid repeated freeze-thaw cycles |
| Reconstitution solvent | Water for injection or bacteriostatic water | Added slowly along the vial wall to reduce foaming and shear |
| Purity measurement | RP-HPLC with area normalisation | Acetonitrile-water gradient monitored at roughly 214 nm |
| Identity confirmation | Electrospray ionisation mass spectrometry | Observed mass compared against the calculated peptide mass |
Melanotan-2 appears on the World Anti-Doping Agency prohibited list within the peptide hormone class, and several national regulators treat it as an unapproved prescription substance. Some countries restrict importation or sale for personal use. Because the compound is widely traded as a research chemical, the practical legal picture differs between jurisdictions and shifts over time. Human safety data covering long periods are limited, and whether repeated pigmentation changes carry any lasting risk to melanocytes remains an open question.
Freeze-dried melanotan-2 is normally kept as a desiccated powder at minus twenty degrees Celsius or lower, shielded from light and moisture. Peptides of this size degrade through hydrolysis, oxidation and deamidation, and each pathway accelerates as temperature and water activity rise. Repeated freeze-thaw cycles promote aggregation and loss of material, so aliquoting a stock solution before freezing is standard laboratory practice. Once dissolved, the solution is markedly less stable than the powder. In laboratory work, solutions are generally refrigerated and used within days rather than kept for months.
The peptide was developed during the 1980s by researchers investigating melanocortin signalling and skin pigmentation pathways. Early work focused on analogues of alpha-melanocyte-stimulating hormone that would resist enzymatic breakdown more effectively than the parent molecule. Melanotan-2 emerged from that programme as a shortened, cyclised variant. Reports describing its synthesis and receptor activity later appeared in the scientific literature. Commercial availability grew through unregulated channels rather than through pharmaceutical approval.
Structurally, Melanotan-2 retains the core recognition motif of alpha-melanocyte-stimulating hormone while adding a lactam bridge that links two side chains and constrains the molecule into a ring. This modification lowers susceptibility to enzymatic degradation. The compound acts as an agonist at melanocortin receptors, particularly subtypes associated with melanin production. Because the same receptor family influences several physiological processes, researchers note that its activity is not confined to pigmentation alone. Receptor selectivity continues to be examined in published studies.
Melanotan-2 is a synthetic cyclic heptapeptide designed as an analogue of alpha-melanocyte-stimulating hormone, a naturally occurring peptide involved in pigmentation signalling. Its sequence incorporates modified residues that increase potency and extend biological activity relative to the native hormone. The compound binds receptors of the melanocortin family and is examined mainly in laboratory research. It does not occur naturally and exists only as a manufactured chemical entity produced by solid-phase synthesis.
11B is more sensitive than 10B and yields sharper signals. The nuclear spin of 10B is 3 and that of 11B is 3/2. Quartz tubes must be used because borosilicate glass interferes with measurement. 13C, a spin-1/2 nucleus, is widely used, despite its relative paucity in naturally occurring carbon (approximately 1.1%). It is stable to nuclear decay. Since there is a low percentage in natural carbon, spectrum acquisition on samples which have not been enriched in 13C takes a long time. Frequently used for labeling of compounds in synthetic and metabolic studies. Has low sensitivity and moderately wide chemical shift range, yields sharp signals. Low percentage makes it useful by preventing spin–spin couplings and makes the spectrum appear less crowded. Slow relaxation of 13C not bonded to hydrogen means that spectra are not integrable unless long acquisition times are used. 14N, spin-1, is a medium sensitivity nucleus with wide chemical shift range. Its large quadrupole moment interferes with acquisition of high-resolution spectra, limiting usefulness to smaller molecules and functional groups with a high degree of symmetry such as in the head-groups of lipids. 15N, spin-1/2, is relatively commonly used. Can be used for isotopically labeling compounds. Very insensitive but yields sharp signals. Low percentage in natural nitrogen together with low sensitivity requires high concentrations or expensive isotope enrichment. 17O, spin-5/2, low sensitivity and very low natural abundance (0.037%), wide chemical shift range (up to 2000 ppm).
== Use == Functional beverages are commonly consumed by people seeking health benefits from their foods and beverages. Both convenience and health have been identified as important factors in consumers' decision-making about food and beverage purchases. Functional drinks are advertised as having various health benefits. For example, some claim to improve heart health, immunity, digestion, and joint health, while others promote themselves as satiating and energy-boosting.
Litigation often begins and is resolved by member state courts. They interpret and apply EU law, and award remedies of compensation and restitution (remedying loss or stripping gains), injunctions and specific performance (making somebody stop or do something). If, however, the position in EU law appears unclear, member state courts can refer questions to the Court of Justice for a "preliminary ruling" on EU law's proper interpretation. TFEU article 267 says court "may" refer "if it considers" this "is necessary to enable it to give judgment", and "shall bring the matter before the Court" if there is no possibility for further appeal and remedy. Any "court or tribunal of a Member State" can refer. This is widely interpreted. It obviously (until Brexit) included bodies like the UK Supreme Court, a High Court, or an Employment Tribunal. In Vaassen v Beambtenfonds Mijnbedrijf the Court of Justice also held that a mining worker pension arbitration tribunal could make a reference. By contrast, and oddly, in Miles v European Schools the Court of Justice held that a Complaints Board of European Schools, set up under the international agreement, the European Schools Convention, could not refer because though it was a court, it was not "of a member state" (even though all member states had signed that Convention).
Two other militiamen were identified as supporters of Daniela Carneiro's campaign. One of them is Cristiano de Oliveira Gouveia, known as Babu, who in a video posted on a social network appears with a sticker displaying Daniela's number. In addition, Babu appears on stage at a rally alongside Daniela and other candidates during the October elections. The other is Eduardo Araújo, a Belford Roxo councilor who was suspended after being appointed municipal secretary of Sustainable Energy of Belford Roxo. Eduardo participated in campaign motorcades with Daniela. The Public Prosecutor's Office says he was responsible for preventing the arrest of other members of the gang. Daniela Carneiro denied such involvement, stating that she does not condone "any illicit act" and that it is up to the courts to "judge and punish"; she also stated that she received support from numerous voters from various municipalities during her campaign. Deputy Marcelo Freixo, who gained notoriety by presiding over the CPI das Milícias in Rio de Janeiro, was appointed president of Embratur, an agency subordinate to the Ministry of Tourism. When questioned about the relationship, Freixo said that "it was up to her [Daniela] to speak about it" and that "my relationship with her is very recent, but very good and full of dialogue".
== Role in metabolism == Sugar phosphates are major players in metabolism due to their task of storing and transferring energy. Not only ribose 5-phosphate but also fructose 6-phosphate are an intermediate of the pentose-phosphate pathway which generates nicotinamide adenine dinucleotide phosphate (NADPH) and pentoses from glucose polymers and their degradation products. The pathway is known as glycolysis where the same carbohydrates are degraded into pyruvates thus providing energy. Enzymes are catalysed for the reactions of these pathways. Some enzymes contain metal centers in their active site which is important part of the enzymes and as well as for the catalysed reaction. The phosphate group can coordinate to the metal center for example, 1,6-bisphosphatase and ADP-ribose pyrophosphatase. Phosphoglycerate and several sugar phosphates that are known intermediates of the Calvin photosynthetic carbon cycle, stimulate light-dependent carbon dioxide fixation by isolated chloroplasts. This ability is shared by certain other metabolites (e.g. glucose 1-phosphate) from which the accepted Calvin-cycle intermediates could easily be derived by known metabolic routes.
Sources: en.wikipedia.org
With ring-opening polymerization, automated synthesis has been used for rapid screening and optimization, including with catalyst + initiator systems and their polymerization conditions. For example, Hoogenboom et al. determined the optimal temperature for the polymerization of 2-ethyl-2-oxazoline in dimethylacetamide (DMAc), allowing for individual heating of the parallel reactors, which shortened the time needed for preparation and analysis. To aid with the catalyst research for polyolefins, Symyx Technologies Inc. used automated synthesis to create a library of palladium and nickel catalysts, which were screened for ethylene polymerization. This process found that the largest polyethylene polymers were created by the complexes with the highest steric hindrance for the ortho-positions of the aryl rings, while electronic factors did not influence yield or molecular weight. In addition, Tuchbreiter and Mülhaupt used automated synthesis to demonstrate the improvements of minireactors for the polymerization of olefins, with quality improving as compared to utilizing simple arrays.
All nuclear data not otherwise stated is from the standard source: Twenty isotopes of californium are known with mass number ranging from 237 to 256; the most stable are 251Cf with half-life 898 years, 249Cf with half-life 351 years, 250Cf at 13.08 years, and 252Cf at 2.645 years. All other isotopes have half-life shorter than a year, and most of these have half-lives less than 20 minutes. 249Cf is formed by beta decay of berkelium-249, and heavier californium isotopes are made by subjecting berkelium to intense neutron radiation in a nuclear reactor. Though californium-251 has the longest half-life, its production yield is relatively low due to its rapid depletion by reaction with another neutron (high neutron cross section). 252Cf is a very strong neutron emitter, which makes it an extremely hazardous radioactive isotope. 252Cf, 96.9% of the time, alpha decays to curium-248; the other 3.1% of decays are spontaneous fission. One microgram of 252Cf emits 2.3 million neutrons per second (about 3.7 neutrons per fission). The other main isotopes of californium (248-251) also alpha decay to those of curium, with a much smaller fraction of fission.
=== Patent expiry === Patent protection for insulin glargine expired in the European Union and the United States in 2014. Insulin glargine from competitor Eli Lilly became available in most countries during 2015, under the brand names Basaglar (as a follow-on in the US) and Abasaglar (as a biosimilar in the EU).
== Georgian military interviews == According to Georgian military interviewed by EurasiaNet, they believed their action initially intended to restore security for Georgian villages in South Ossetia, with one lieutenant from 4th Brigade saying: "Our goal was to put an end to fighting in the area and take control. Nobody in the army expected a war with Russia." Georgian soldiers said they had earlier anticipated an attack from Abkhazia, with the 4th Brigade lieutenant saying that they "were preparing for something in May when Georgia was denied NATO membership [a Membership Action Plan]." There "were no preparations made" for a military action in South Ossetia in August, since "Many were on vacation and we were preparing to go Iraq in the fall." The 4th brigade loaded tanks and missile launchers on a train, destined for the city of Gori, after receiving an unexpected alarm call on 7 August 2008. The 4th Brigade began an operation against South Ossetian separatists during the night of 7–8 August, which marked their first combat, and undertook action in three directions, one of which was intended to deflect South Ossetians from the main Georgian goal. One anonymous mid-ranking commander said Georgian army attempted to take control over an important road to the north of Tskhinvali (leading to the Roki Tunnel), which was being defended by South Ossetian garrison near the village of Tbeti and the first Russian tanks arrived during this battle. The anonymous Georgian commander also said, "We destroyed one tank after another, but they kept coming."
==== Sensors ==== A fluorescent nanogel thermometer was developed to measure temperatures to within 0.5 °C (0.90 °F) in living cells. The cell absorbs water when colder and squeezes the water out as its internal temperature rises; the relative quantity of water masks or exposes the fluorescence of the nanogel.
Sources: en.wikipedia.org
Low temperature slows hydrolysis and oxidation, the two main routes by which the peptide backbone and side chains are modified. A lyophilised powder stored at −20 °C is more stable than one kept at room temperature, and once the material is dissolved the degradation rate rises, making refrigeration more important.
Liquid chromatography coupled to mass spectrometry is the most common approach because it combines a retention time with a mass measurement. A chromatographic peak alone cannot establish which peptide is present, so mass determination or amino acid analysis is used as an orthogonal confirmation alongside the separation.
This depends on buffer, pH, and concentration, and published stability data for this peptide are limited. In practice laboratories work through a refrigerated solution within a few weeks and discard samples that show cloudiness or visible particles. Freezing and thawing repeatedly is generally discouraged.
It is a synthetic cyclic heptapeptide analogue of alpha-melanocyte-stimulating hormone, containing seven amino acids with a lactam ring and a D-configured phenylalanine residue. It is supplied as a lyophilised powder for laboratory research.