lyophilized powder is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Updated 2026-07-04. Numbers and descriptions here follow the published literature rather than marketing material.
The molecular backbone consists of seven amino acid residues joined into a ring through a disulfide bridge. This cyclic conformation is critical for receptor binding. The sequence includes an acetylated N-terminus and an amidated C-terminus, modifications that improve resistance to enzymatic breakdown. One residue is in the D-configuration, a feature that further stabilizes the peptide against protease activity. Together, the ring structure and specific stereochemistry determine selectivity among melanocortin receptor subtypes.
Across literature and commercial listings, the substance appears under several names, including bremelanotide, PT-141, and various brand designations. A CAS registry number provides a unique identifier for the compound, aiding retrieval from chemical databases. Synonym lists may also contain early development codes and descriptive chemical names. When consulting sources, researchers need to confirm that the cited names refer to the same molecular structure to avoid confusion. Naming consistency matters especially when comparing analytical data across publications.
Approved use is narrow and jurisdiction-specific. In the United States, the injectable product is authorised for premenopausal women with acquired, generalised hypoactive sexual desire disorder, a diagnosis that requires documented distress. It is not approved for men, for postmenopausal women, or for use alongside hormonal contraceptives under the approved labelling. Outside regulated markets, the same peptide is frequently sold as a research chemical, where identity, purity, and sterility are not independently verified.
Bremelanotide is a synthetic cyclic heptapeptide developed as an analogue of alpha-melanocyte-stimulating hormone, a naturally occurring peptide involved in pigmentation and appetite signalling. Its structure contains seven amino acid residues joined by a lactam bridge that closes the ring between two side chains. The molecular formula is C50H68N14O10 and the nominal molecular mass is near 1025 daltons. Much of the early laboratory literature refers to the same molecule by the development code PT-141.
The compound emerged from a research programme examining melanocortin analogues for effects on skin pigmentation. During early human studies, participants reported spontaneous erections as an unexpected side effect, which redirected development toward sexual function rather than tanning. An intranasal formulation was investigated in clinical trials but did not reach market approval. A subcutaneous injectable version later completed the regulatory process, and the nasal route does not appear in approved labelling.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Cyclic peptide | Melanocortin receptor agonist family |
| Molecular weight | Approximately 1025 Da | Free base form |
| Appearance | White to off-white powder | Lyophilized product |
| Solubility | Soluble in water | Also dissolves in polar organic solvents |
| Storage temperature | -20 degrees Celsius | Dry and protected from light |
Clinical development of bremelanotide proceeded through several reformulation attempts. An early intranasal version was discontinued, and a subcutaneous auto-injector formulation later received approval for hypoactive sexual desire disorder in premenopausal women. Approval decisions have varied by country and over time, and the product has not been universally adopted. Blood pressure elevation is a documented effect, which is why some jurisdictions require monitoring after administration. The clinical evidence base continues to evolve as additional studies are published.
Bremelanotide is a cyclic heptapeptide that acts as an agonist at melanocortin receptors. It binds MC1R, MC3R, MC4R, and MC5R, with MC4R activation considered most relevant to sexual desire pathways in the central nervous system. The molecule is a synthetic analog of alpha-melanocyte-stimulating hormone, a naturally occurring peptide involved in pigmentation and energy regulation. Early research explored its use in tanning before attention shifted toward sexual dysfunction applications. Receptor binding affinity varies across these subtypes.
Handling procedures emphasize minimizing moisture uptake, since the dried solid is hygroscopic and can draw water when warmed to room temperature before a vial is opened. Laboratories record lot number, purity, counter-ion content, and residual solvent data supplied by the producer. Impurity profiles are compared run to run, and any shift in retention time or peak shape prompts re-verification against a reference standard. Certificates of analysis are treated as claims to be checked rather than accepted at face value.
Identity and purity testing for this peptide typically relies on reversed-phase high-performance liquid chromatography with ultraviolet detection, reported as area-percent purity. Mass spectrometry, usually in tandem mode, confirms molecular mass and supports quantification in biological matrices. Sequence confirmation may use peptide mapping after enzymatic digestion, while nuclear magnetic resonance and circular dichroism supply supplementary structural detail. No single technique establishes identity alone, so laboratories compare retention time, mass, and fragment pattern against a verified reference standard.
The lactam ring that closes the peptide backbone improves resistance to exopeptidase attack, but the molecule stays susceptible to hydrolysis and oxidation once dissolved. Degradation accelerates with temperature, extreme pH, and light exposure, and repeated freeze-thaw cycles promote aggregation and material loss. Lyophilized powder held desiccated at or below minus twenty degrees Celsius is the common way to keep reference material. Reconstituted solutions are generally kept cold and used within a short window because their stability is far lower than that of the dry solid.
== Publications == Tongraar, A.; Liedl, K. R.; Rode, Bernd M. (1997);"Solvation of Ca2+ In Water Studied By Born-Oppenheimer Ab-Initio QM/MM Dynamics"; J. Phys. Chem. A 1997, 101(35), p. 6299-6309,DOI: 10.1021/jp970963t. Rode, Bernd M.; Schwenk, Christian F., Tongraar, Anan (2004); "Structure and Dynamics of Hydrated Ions - New Insights through Quantum Cechanical Simulation"; J. Mol. Liq. 2004, 110(1-3), pp. 105–122. DOI: 10.1016/j.molliq.2003.09.016. Hofer, Thomas; Pribil, Andreas; Randolf, Bernhard; Rode, Bernd M. (2005); "Structure and dynamics of solvated Sn(II) in aqueous solution - an ab initio QM/MM MD approach", J. Am. Chem. Soc. 2005, 127(41), p. 14231-14238. DOI:10.1021/ja052700f. Rode, Bernd M.; Schwenk, Christian; Hofer, Thomas; Randolf, Bernhard (2005); "Coordination and ligand exchange dynamics of solvated metal ions"; Coord. Chem. Rev. 2005, 249(24), pp. 2993-–3006. DOI: doi:10.1016/j.ccr.2005.03.032. Rode, Bernd M.; Hofer, Thomas (2006); "How to Access Structure and Dynamics of Solutions: The Capabilities of Computational Methods", Pure Appl. Chem. 2006, 78(3), pp. 525–539. DOI: 10.1351/pac200678030525. Rode, Bernd M.; Hofer, Thomas; Randolf, Bernhard; Schwenk, Christian; Xenides, Demetrios; Vchirawongkwin, Viwat(2006); "Ab initio Quantum Mechanical Charge Field (QMCF) Molecular Dynamics - A QM/MM - MD Procedure for Accurate Simulations of Ions and Complexes"; Theor. Chem. Acc. 2006, 115(2-3), pp. 77–85. DOI: 10.1007/s00214-005-0049-1. Hofer, Thomas S.; Randolf, Bernhard R.; Rode, Bernd M.
=== Instant coffee === In March 2009, Starbucks introduced a line of instant coffee packets, called VIA "Ready Brew". It was first unveiled in New York City with subsequent testing of the product also in Seattle, Chicago, and London. The first two VIA flavors include Italian Roast and Colombia, which were then rolled out in October 2009, across the U.S. and Canada with Starbucks stores promoting the product with a blind "taste challenge" of the instant versus fresh roast, in which many people could not tell the difference between the instant and freshly brewed coffee. Financial analysts speculated that by introducing instant coffee, Starbucks would devalue its own brand.
The numbering of the draft picks in this list may be different from the agreed draft picks at the time of the trade, due to adjustments from either the insertion of free agency compensation draft picks or clubs exiting the draft before later rounds.
== Members == Four members of 2A peptides family are frequently used in life science research. They are P2A, E2A, F2A, and T2A. F2A is derived from foot-and-mouth disease virus 18; E2A is derived from equine rhinitis A virus; P2A is derived from porcine teschovirus-1 2A; T2A is derived from thosea asigna virus 2A. The following table shows the sequences of four members of 2A peptides. Adding the optional linker “GSG” (Gly-Ser-Gly) on the N-terminal of a 2A peptide greatly helps with efficiency.
A formal announcement of his victory took place on December 12, 2014, with Shumlin and other supporters on the Statehouse steps. His public fight drew regional and national attention, the support of Shumlin, and a team of pro-bono law students from the University of New Hampshire legal clinic. After 22 years with The Richards Group, Chick-fil-A switched to McCann New York in 2016. Along with the cows, ads included famous people in history in a campaign called "Chicken for Breakfast. It's not as crazy as you think."
Sources: en.wikipedia.org
Official site of the federal government Official tourism site Germany from BBC News Germany. The World Factbook. Central Intelligence Agency. Germany from the OECD Germany at the EU Geographic data related to Germany at OpenStreetMap
=== Prevention and other services === Aside from diagnosing and treating acute conditions, the Internist may also assess disease risk and recommend preventive screening and intervention. Some of the tools available to the Internist include genetic evaluation. Internists also routinely provide pre-operative medical evaluations including individualized assessment and communication of operative risk. Training the next generation of internists is an important part of the profession. As mentioned above, post-graduate medical education is provided by licensed doctors as part of accredited education programs that are usually affiliated with teaching hospitals. Studies show that there are no differences in patient outcomes in teaching versus non-teaching facilities. Medical research is an important part of most post-graduate education programs, and many licensed doctors continue to be involved in research activities after completing post-graduate training.
(1936), Recollections and Reflections, London: G. Bell & Sons, Ltd. Republished as digital edition, Cambridge: University Press, 2011 (Cambridge Library Collection series). Thomson, George Paget. (1964) J.J. Thomson: Discoverer of the Electron. Great Britain: Thomas Nelson & Sons, Ltd. Davis, Eward Arthur & Falconer, Isobel (1997), J.J. Thomson and the Discovery of the Electron. ISBN 978-0-7484-0696-8 Falconer, Isobel (1988) "J.J. Thomson's Work on Positive Rays, 1906–1914" Historical Studies in the Physical and Biological Sciences 18(2) 265–310 Falconer, Isobel (2001) "Corpuscles to Electrons" in J Buchwald and A Warwick (eds) Histories of the Electron, Cambridge, Mass: MIT Press, pp. 77–100. Navarro, Jaume (2005). "J. J. Thomson on the Nature of Matter: Corpuscles and the Continuum". Centaurus. 47 (4): 259–282. Bibcode:2005Cent...47..259N. doi:10.1111/j.1600-0498.2005.00028.x. Downard, Kevin M. (2009). "J. J. Thomson goes to America". Journal of the American Society for Mass Spectrometry. 20 (11): 1964–1973. Bibcode:2009JASMS..20.1964D. doi:10.1016/j.jasms.2009.07.008. PMID 19734055. S2CID 34371775.
=== United States === In December 2011, the Drug Enforcement Administration (DEA) issued the final ruling placing carisoprodol on Schedule IV of the Controlled Substances Act (CSA). The placement of carisoprodol on Schedule IV was effective January 2012.
==== Topical ==== There are several NSAIDs available for topical use, including diclofenac, which may provide symptomatic relief of osteoarthritis. Recessed joints (joints located deep within the body, rather than near the skin surface, such as the hips) may be less responsive to treatment with topical therapies. Transdermal opioid pain medications are not typically recommended in the treatment of osteoarthritis. The use of topical capsaicin to treat osteoarthritis is controversial, as some reviews found benefit while others did not.
Sources: en.wikipedia.org
It belongs to the melanocortin receptor agonist family of peptides. Its cyclic structure distinguishes it from linear peptides and shapes its receptor binding profile.
It emerged from research on melanotan II. Investigators exploring derivatives observed distinct pharmacological features related to sexual function.
Common names include bremelanotide and PT-141. Chemical databases may also list early development codes and descriptive names.
It is a synthetic cyclic peptide that acts as an agonist at melanocortin receptors. It is not a hormone replacement therapy and not a vasodilator in the usual clinical sense, although it does affect vascular tone. Chemically it belongs to the melanocortin analogue family.