A practical reference on HPLC-UV: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2026-07-18. Anything still debated is marked as such rather than presented as settled.
Regulatory and sporting contexts treat SR9009 as a prohibited substance in many elite competitions. Its presence on banned lists reflects concerns about performance enhancement and unknown long-term safety. Analytical chemists have developed methods to detect the parent compound and its metabolites in urine and blood. Literature discussions distinguish between in vitro potency, animal pharmacology, and anecdotal human reports. The latter are difficult to verify because products sold online may lack purity or contain different compounds.
SR9009 is a synthetic small molecule studied as an agonist of the nuclear receptors REV-ERBα and REV-ERBβ. These receptors help regulate circadian rhythms, lipid metabolism, and inflammatory gene expression. In cell and animal experiments, SR9009 alters transcription of clock-controlled genes and metabolic pathways. The compound is not a hormone and does not resemble classical steroid structures. Its activity depends on binding to the ligand-binding domain of REV-ERB, where it can modify corepressor recruitment.
Handling practices for SR9009 focus on minimizing degradation and contamination. The solid is generally stored desiccated at or below -20 °C, protected from light and moisture. Stock solutions are often prepared in dimethyl sulfoxide or ethanol, then aliquoted to avoid repeated freeze–thaw cycles. Aqueous solubility is low, so formulations for animal studies may require cosolvents or suspending agents. Personnel should follow institutional chemical safety procedures, because toxicological data for humans are incomplete.
Regulatory status varies by country and intended use. Major drug agencies have not granted marketing authorization for SR9009 as a medicine, and it is not listed as a controlled substance in many jurisdictions. It is often sold as a research chemical, a category that may fall outside pharmaceutical manufacturing rules. Buyers should verify local laws and supplier documentation, including certificates of analysis. The lack of standardized quality controls raises concerns about identity, purity, and actual content in products marketed online.
In laboratory settings, SR9009 is commonly identified by its molecular structure and its interaction with REV-ERB receptors. Vendors may list it under synonyms such as Stenabolic or REV-ERB agonist, but those names do not define purity or identity. Analytical confirmation typically uses high-performance liquid chromatography with ultraviolet detection or liquid chromatography–mass spectrometry. A reference standard is needed to compare retention time and mass spectrum, because the compound can be confused with related research chemicals.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic REV-ERB agonist | Binds REV-ERBα and REV-ERBβ in preclinical models |
| Molecular formula | C20H24ClN3O4S | Reported for the parent compound |
| CAS Registry Number | 1379686-30-2 | Common identifier in chemical databases |
| Appearance | Off-white to pale yellow solid | Typical research chemical solid |
| Solubility | Soluble in DMSO and ethanol; low in water | Class: small organic molecule |
Regulatory treatment of SR9009 varies by country and region. It is not approved as a pharmaceutical, and several jurisdictions restrict its sale for human consumption. Some authorities classify it as a research chemical, a prescription-only substance, or a prohibited performance-enhancing agent in sport. Purchasers may encounter certificates of analysis, but these documents do not guarantee identity, purity, or legality. In research settings, institutional safety reviews and controlled procurement help ensure that materials are handled under appropriate oversight. The absence of harmonized rules means that legal status can change and requires verification.
Analytical identification of SR9009 typically relies on liquid chromatography coupled with tandem mass spectrometry. In biological samples, researchers first separate the compound from matrix components using protein precipitation, liquid-liquid extraction, or solid-phase extraction. High-performance liquid chromatography with ultraviolet detection and nuclear magnetic resonance spectroscopy can support structural confirmation of reference materials. Because SR9009 is a small, relatively lipophilic molecule, reverse-phase columns and acidic mobile phases are common. Laboratories often include isotope-labeled internal standards to improve quantification and to correct for ion suppression.
Mechanistically, SR9009 binds the ligand-binding domain of REV-ERBα/β and enhances recruitment of corepressor complexes. This represses target genes rather than activating them. Because REV-ERB proteins normally compete with ROR proteins at shared response elements, the net effect depends on tissue and timing. Researchers use SR9009 to probe how nuclear receptor signaling links the clock to metabolism, inflammation, and muscle biology. Findings are largely preclinical, and the precise contribution of each receptor subtype remains under study.
SR9009 is frequently discussed in fitness and research-chemical contexts, yet it has no approved medical indication. Regulatory agencies have not authorized it for human use, and it is not a standard prescription drug. Some sports organizations list it as a prohibited substance because of its potential performance-enhancing properties. Published human data are sparse, so claims about its effects in people often rely on animal models or anecdotal reports. Quality and identity of online materials can vary widely.
SR9009 is a synthetic small molecule studied as an agonist of REV-ERB nuclear receptors. REV-ERB alpha and REV-ERB beta help regulate circadian rhythms and metabolic gene expression. In laboratory research, SR9009 has been used to probe how these receptors affect skeletal muscle, liver, and adipose tissue. The compound was identified in academic drug-discovery work and is often described in scientific literature by its chemical name and research code. It is not an approved medicine, and human clinical data remain limited or absent.
SR9009 binds REV-ERB receptors and alters their repressive activity on target genes. This action can change transcription of genes involved in lipid handling, glucose metabolism, and mitochondrial function. In rodent studies, treated animals have shown changes in muscle oxidative capacity and exercise performance, though effects vary by dose, duration, and model. The precise molecular steps connecting receptor binding to whole-body outcomes are still an active area of investigation. Findings in animals do not automatically translate to humans.
=== Foreign relations === On 18 June 2013, he met with Fra’ Matthew Festing, the Prince and Grand Master of the Sovereign Military Order of Malta, where they talked about humanitarianism, Gnassingbé's efforts to improve Togo's humanitarian contributions in his presidency. In 2010, Prime Minister of Japan Yukio Hatoyama congratulated Gnassingbé for winning that year's presidential election. In 2023, Gnassingbé met Fumio Kishida in the Japan-Togo summit meeting where Kishida expressed his support for Gnassingbé for visiting the funeral of Shinzo Abe. In 2025, Gnassingbé was selected as a mediator by the African Union to replace Angolan president João Lourenço in resolving the conflict in the Democratic Republic of the Congo.
=== Historical uses === Realgar was used by firework manufacturers in white flame and star compositions and to produce yellow smoke in daytime fireworks. Realgar has been used to kill weeds, insects, and rodents, even though more effective arsenic-based anti-pest agents are available such as cacodylic acid, (CH3)2As(O)OH, an organoarsenic compound used as an herbicide. Realgar was also used by Ancient Greek apothecaries to make a medicine known as "bull's blood". The Greek physician Nicander described a death by "bull's blood", which matches the known effects of arsenic poisoning. Bull's blood is the poison that is said to have been used by Themistocles and Midas for suicide. The Chinese name for realgar is 雄黃 (Mandarin xiónghuáng), literally 'masculine yellow', as opposed to orpiment which is 'feminine yellow'. Realgar was, along with orpiment, traded in the Roman Empire and was used as a red paint pigment. Early occurrences of realgar as a red paint pigment are known for works of art from China, India, Central Asia, and Egypt. It was used in Venetian fine-art painting during the Renaissance era, though rarely elsewhere in Europe, a use which died out by the 18th century. It was also used as medicine. Other traditional uses include manufacturing lead shot, printing, and dyeing calico cloth. It was used to poison rats in medieval Spain and in 16th century England.
=== European Union === In the European Union, semaglutide is indicated for the treatment of adults with insufficiently controlled type 2 diabetes as an adjunct to diet and exercise as monotherapy when metformin is considered inappropriate due to intolerance or contraindications, in addition to other medicinal products for the treatment of diabetes. Semaglutide (as Wegovy) is further indicated as an adjunct to a reduced-calorie diet and increased physical activity for weight management, including weight loss and weight maintenance, in adults with obesity (initial BMI ≥ 30 kg/m2) or who are overweight (initial BMI ≥ 27 kg/m2) and have at least one weight-related comorbidity such as dysglycemia (prediabetes or type 2 diabetes), hypertension, dyslipidemia, or cardiovascular disease. It is also indicated as an adjunct to a reduced-calorie diet and increased physical activity for weight management in adolescents (aged twelve years and older) with obesity and body weight above 60 kg (130 lb). Semaglutide (as Kayshild) is indicated in conjunction with diet and exercise for the treatment of adults with non-cirrhotic metabolic dysfunction-associated steatohepatitis (MASH) with moderate or advanced liver fibrosis (stage F2 or F3).
== Biography == Tanner joined SCIEX, which later became MDS SCIEX, in 1980 as a research scientist. He became principal scientist in 2000. In his 25 years at SCIEX, Tanner developed and helped to commercialize a string of mass spectrometry products. Tanner published over 74 peer-reviewed scientific articles, and holds 22 US patents (with corresponding filings in other countries), including 13 patents on Mass Cytometry technology Tanner was a co-founder of DVS Sciences and, as the president and CEO, saw the company through the development and commercial launch of its first products. The products that DVS Sciences brought to the global market were originally developed at the University of Toronto where Tanner was a professor in the Institute of Biomaterials and Biomedical Engineering and then in chemistry.
Sources: en.wikipedia.org
=== Vitrification === Vitrification is a flash-freezing (ultra-rapid cooling) process that helps to prevent the formation of ice crystals and helps prevent cryopreservation damage. Researchers Greg Fahy and William F. Rall helped to introduce vitrification to reproductive cryopreservation in the mid-1980s. As of 2000, researchers claim vitrification provides the benefits of cryopreservation without damage due to ice crystal formation. The situation became more complex with the development of tissue engineering as both cells and biomaterials need to remain ice-free to preserve high cell viability and functions, integrity of constructs and structure of biomaterials. Vitrification of tissue engineered constructs was first reported by Lilia Kuleshova, who also was the first scientist to achieve vitrification of oocytes, which resulted in live birth in 1999. For clinical cryopreservation, vitrification usually requires the addition of cryoprotectants before cooling. Cryoprotectants are macromolecules added to the freezing medium to protect cells from the detrimental effects of intracellular ice crystal formation or from the solution effects, during the process of freezing and thawing. They permit a higher degree of cell survival during freezing, to lower the freezing point, to protect cell membrane from freeze-related injury. Cryoprotectants have high solubility, low toxicity at high concentrations, low molecular weight and the ability to interact with water via hydrogen bonding. Instead of crystallizing, the syrupy solution becomes an amorphous ice—it vitrifies.
=== Relaxed control in near-border areas === Bhutan: For example, the relaxed border controls maintained by Bhutan for those not proceeding past Phuentsholing and certain other border cities enable travellers to enter without going through any document check whatsoever. America: The Border Crossing Card issued by American authorities to Mexican nationals enables Mexicans to enter border areas without a passport. Both United States and Bhutan maintain interior checkposts to enforce compliance. China: China maintains relaxed border controls for individuals lawfully in Hong Kong or Macau to visit the surrounding Pearl River Delta visa-free provided that certain conditions are met. Belarus The "Brest – Grodno" visa-free territory, established by a presidential decree signed in August 2019, has permitted local visa-free access to most visitors lawfully present in the neighbouring Schengen Area since 10 November 2019. Visitors are allowed to stay without a visa for 15 days. Entry is possible through designated checkpoints with Poland and Lithuania, Brest-Uschodni Railway Station, Grodno Railway Station, Brest Airport and Grodno Airport. Before travel, visitors must obtain authorisation from a local travel agency in Belarus.
polymerization The formation of a polymer from its constituent monomers; the chemical reaction or series of reactions by which monomeric subunits are covalently linked together into a polymeric chain or branching aggregate; e.g. the polymerization of a nucleic acid chain by linking consecutive nucleotides, a reaction catalyzed by a polymerase enzyme.
Prominent Romanian painters include: Nicolae Grigorescu, Ștefan Luchian, Ion Andreescu Nicolae Tonitza, and Theodor Aman. Notable Romanian classical composers of the 19th and 20th centuries include: Ciprian Porumbescu, Anton Pann, Eduard Caudella, Mihail Jora, Dinu Lipatti, and especially George Enescu. The annual George Enescu Festival is held in Bucharest in honour of the 20th-century composer. Contemporary musicians like Angela Gheorghiu, Gheorghe Zamfir, Inna, Alexandra Stan, and many others have achieved various levels of international acclaim. From the late 2000s through the early 2010s, the Romanian popcorn music style had established itself in the international mainstream. At the Eurovision Song Contest Romanian singers achieved third place in 2005 and 2010. In cinema, several movies of the Romanian New Wave have achieved international acclaim. At the Cannes Film Festival, The Death of Mr. Lazarescu by Cristi Puiu won the Prix Un Certain Regard in 2005, while 4 Months, 3 Weeks and 2 Days by Cristian Mungiu won the festival's top prize, the Palme d'Or, in 2007. At the Berlin International Film Festival, Child's Pose by Călin Peter Netzer won the Golden Bear in 2013. The list of World Heritage Sites includes six cultural sites located within Romania, including eight painted churches of northern Moldavia, eight wooden churches of Maramureș, seven villages with fortified churches in Transylvania, the Horezu Monastery, and the Historic Centre of Sighișoara.
Huntington's or Huntington disease (HD), also known as Huntington's chorea, is a fatal neurodegenerative disease that is usually inherited. It typically presents as a triad of progressive psychiatric, cognitive, and motor symptoms. The earliest symptoms are often subtle problems with mood or mental/psychiatric abilities, which precede the motor symptoms for many people. The definitive physical symptoms, including a general lack of coordination and an unsteady gait, eventually follow. Over time, the basal ganglia region of the brain gradually becomes damaged. The disease is primarily characterized by a distinctive hyperkinetic movement disorder known as chorea. Chorea classically presents as uncoordinated, involuntary, "dance-like" body movements that become more apparent as the disease advances. Physical abilities gradually worsen until coordinated movement becomes difficult and the person is unable to talk. Mental abilities generally decline into dementia, depression, apathy, and impulsivity at times. The specific symptoms vary somewhat among cases. Symptoms can start at any age, but are usually first seen around the age of 40. The disease may develop earlier in each successive generation. About eight percent of cases start before the age of 20 years, and are known as juvenile HD, which typically present with the slow movement symptoms of Parkinson's disease rather than those of chorea. HD is typically inherited from an affected parent, who carries a mutation in the huntingtin gene (HTT), which encodes the huntingtin protein.
Sources: en.wikipedia.org
== Nanomaterial Interfaces == Applications of nanotechnology often depend on the lateral assembly and spatial arrangement of nanoparticles at interfaces. Chemical reactions can be induced at solid/liquid interfaces by manipulating the location and orientation of functional groups of nanoparticles. This can be achieved through external stimuli or direct manipulation. Changing the parameters of the external stimuli, such as light and electric fields, has a direct effect on assembled nanostructures. Likewise, direct manipulation takes advantage of photolithography techniques, along with scanning probe microscopy (SPM), and scanning tunneling microscopy (STM), just to name a few.
Cod is popular as a food with a mild flavour and a dense, flaky white flesh. Cod livers are processed to make cod liver oil, an important source of vitamin A, vitamin D, vitamin E and omega-3 fatty acids (EPA and DHA).
8 October – Tánaiste Micheál Martin said that the Department of Foreign Affairs had been in touch with the family of Kim Damti (22), an Irish-Israeli woman who was unaccounted for following the previous day's series of attacks launched by Hamas on Israel. On 11 October, Damti was confirmed dead. 10 October – Minister for Finance Michael McGrath and Minister for Public Expenditure, National Development Plan Delivery and Reform Paschal Donohoe announced Budget 2024, with three electricity credits for all households, a €12 increase to core social welfare payments and half-price travel for those aged under 25. 23 October – Yousef Palani was sentenced to two life sentences plus 20 years for the murder of two men and the stabbing of a third in Sligo, all of who he had sought out on a pretence of dating. 25 October – The Health Products Regulatory Authority (HPRA) said it had seized 254 units of falsified Semaglutide, a drug used for type 2 diabetes and as an unofficial aide to weight loss, during 2023. 27 October – Latest figures showed that homelessness in Ireland hit new records: 8,923 adults and 3,904 children accessed emergency accommodation in September 2023, bringing the total to 12,827 people.
Mycofactocin is thought to play a role in redox pathways involving nicotinoproteins, enzymes with non-exchangeable bound nicotinamide adenine dinucleotide (NAD). This notion comes largely from comparative genomics work that highlighted the many parallels between mycofactocin and pyrroloquinoline quinone (PQQ). In both cases, maturation of the RiPP requires post-translational modification of a precursor peptide by a radical SAM enzyme, the system appears in very similar form in large numbers of species, the product appears to be used within the cell rather than exported, and several families of enzymes occur exclusively in bacteria with those systems. The number of putatively mycofactocin-dependent oxidoreductases encoded by a single genome can be quite large: at least 19 for Rhodococcus jostii RHA1, and 26 for the short chain dehydrogenase/reductase (SDR) family alone in Mycobacterium avium. The enzyme LimC (Q9RA05), a nicotinoprotein carveol dehydrogenase (EC 1.1.1.n4), is shown to use both MFT and PMFT in vitro.
Sources: en.wikipedia.org
SR9009 is a synthetic small molecule studied as an agonist of the REV-ERB nuclear receptors. It is not an approved medicine, and its effects in humans are not well characterized.
No. It is a synthetic ligand that binds nuclear receptors, not a steroid or peptide hormone. Its activity depends on receptor binding rather than endocrine secretion.
Clinical evidence is limited. Most published data come from cell and animal experiments. Human safety and efficacy remain uncertain.
Liquid chromatography–mass spectrometry is common for identity and purity checks. High-performance liquid chromatography with ultraviolet detection can also be used. Both methods require a suitable reference standard.