If you have been reading about certificate of analysis and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Updated 2026-01-10. Numbers and descriptions here follow the published literature rather than marketing material.
Quality control for research materials includes identity confirmation by nuclear magnetic resonance and purity assessment by high-performance liquid chromatography. Mass spectrometry provides molecular weight confirmation and can detect related impurities. Purchasers should request a certificate of analysis that lists lot-specific data. Online products advertised for human use often lack such documentation. Distinguishing legitimate research material from mislabeled or contaminated samples is a recurring challenge in independent testing, and independent laboratories may use orthogonal methods to verify identity.
Detection of SR9009 in biological samples usually relies on liquid chromatography coupled to tandem mass spectrometry. This approach separates the compound from matrix components and identifies it by mass transitions. Because SR9009 can undergo metabolism, laboratories often look for both parent drug and specific metabolites. Sample preparation may involve protein precipitation or solid-phase extraction. Method validation examines sensitivity, carryover, and interference from related substances, and reference standards are required for accurate calibration.
Identity and purity testing for SR9009 commonly uses liquid chromatography coupled with tandem mass spectrometry. This method separates the compound from matrix components and detects it by mass-to-charge transitions, providing sensitive and specific confirmation. Nuclear magnetic resonance spectroscopy can support structural identification, while high-performance liquid chromatography with ultraviolet detection may estimate purity. Because online products labeled as SR9009 may contain other substances or no active compound at all, independent verification is important in research settings. Certificates of analysis are useful but not a substitute for in-house testing.
Laboratory samples of SR9009 are typically supplied as a white to off-white powder. The compound dissolves readily in organic solvents such as dimethyl sulfoxide and ethanol, while its solubility in water is low. Because of this solubility profile, researchers often prepare concentrated stock solutions in an organic solvent before diluting them into aqueous assay buffers. Light exposure, moisture, and repeated freeze-thaw cycles can degrade many small molecules, so handling procedures usually aim to minimize these factors. Purity is commonly checked before use.
| Property | Value | Notes |
|---|---|---|
| Typical storage temperature | -20 °C or lower | Desiccated and protected from light |
| Common analytical method | LC-MS/MS | Detects parent drug and metabolites |
| Solubility class | Lipophilic; soluble in organic solvents | Low aqueous solubility |
| Molecular weight | 437.94 g/mol | Calculated from reported formula |
| Synonyms | SR9009; REV-ERB agonist | Code name used in scientific literature |
Pharmacokinetic data for SR9009 are limited in published literature. Some reports indicate low oral bioavailability and rapid clearance in animals, which complicates interpretation of exposure and effect. Researchers often use injected routes in preclinical work to achieve measurable systemic levels. Analytical studies rely on mass spectrometry to detect the parent compound and its metabolites. Questions about tissue distribution, active metabolites, and long-term consequences remain open. Species differences in metabolism can affect observed half-life and target engagement.
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 and metabolic gene expression. In laboratory experiments, SR9009 binds these receptors and alters transcription of genes involved in lipid handling, glucose metabolism, and mitochondrial function. It is not a naturally occurring compound and has no approved therapeutic use. Research interest stems from its ability to modify energy metabolism in cells and animal models.
In rodent studies, SR9009 has been reported to increase mitochondrial content in skeletal muscle and improve exercise endurance under some conditions. These findings led to popular descriptions such as an exercise mimetic, although that term oversimplifies the biology. Effects vary by dose, timing, tissue, and model. The compound's influence on circadian pathways means that time of administration can matter in experiments. Whether similar metabolic changes occur in humans remains largely unexplored in controlled published trials.
Identity and purity of SR9009 samples are usually checked with chromatographic and spectrometric methods. High-performance liquid chromatography can separate the compound from related impurities, while mass spectrometry provides molecular mass confirmation. Nuclear magnetic resonance spectroscopy may be used for structural verification in research settings. No single method proves biological activity, and certificates of analysis should be reviewed alongside raw data. Independent testing is often needed because online products vary widely.
SR9009 stability depends on temperature, moisture, light, and solvent. Solid material is generally kept cool and dry, while solutions may require protection from repeated warming and cooling. Degradation can appear as color changes, precipitate, or new chromatographic peaks. Researchers should follow supplier instructions and their own stability data. Long-term storage conditions for human use have not been established because the compound lacks approved clinical formulation.
SR9009 is supplied as a solid research chemical, often in milligram quantities. Laboratories typically weigh it in a controlled environment because fine powders can disperse. Stock solutions are commonly prepared in dimethyl sulfoxide and stored in small aliquots to reduce freeze-thaw cycles. Personal protective equipment and chemical fume hoods are standard when handling unknown or potent compounds. These practices address laboratory safety rather than human use.
In laboratory settings, SR9009 is typically characterized by liquid chromatography–mass spectrometry (LC-MS) or high-performance liquid chromatography with ultraviolet detection (HPLC-UV). These methods can confirm identity and estimate purity, but they require reference standards for accurate quantification. Because SR9009 is not a licensed pharmaceutical, no harmonized pharmacopeial monograph exists. Laboratories often validate in-house methods for matrices such as plasma, urine, or cell culture media. Sample preparation may involve protein precipitation or liquid-liquid extraction before analysis.
Physicochemical behavior influences handling. SR9009 is described as a solid with limited aqueous solubility, so organic solvents such as dimethyl sulfoxide or ethanol are common in research stock solutions. Aqueous dilution can produce precipitates if the organic content is too low. Light, heat, and repeated freeze-thaw cycles may affect stability. Storage recommendations usually specify a desiccated freezer environment protected from light, but exact stability data depend on the formulation and matrix.
REV-ERB proteins help regulate daily cycles in gene expression, including genes tied to lipid and glucose metabolism. SR9009 binds these receptors and alters their activity in cell and animal experiments. Consequences observed in rodents include changes in skeletal muscle oxidative capacity, blood lipid levels, and exercise performance. The precise chain from receptor occupancy to whole-body effects is still an active area of study. Human responses cannot be assumed from rodent data.
Most published work on SR9009 consists of preclinical studies. It is widely sold as a research chemical, a category that does not imply safety, efficacy, or pharmaceutical-grade quality. Sports anti-doping organizations have listed SR9009 as a prohibited substance, and its presence in an athlete sample can lead to sanctions. Legal status differs by country; in several jurisdictions it is not approved for human consumption and may be treated as an unapproved new drug.
SR9009 is a synthetic small molecule studied as an agonist of the nuclear receptors REV-ERBα and REV-ERBβ. It is not a steroid, peptide, or natural hormone. In scientific literature, it appears under the code SR9009 and in non-scientific contexts as Stenabolic. The compound was identified through chemical screening efforts aimed at targeting circadian clock components. Its status remains investigational, and no regulatory agency has approved it as a human medicine.
=== Earliest recorded cases === OI has been identified in an ancient Egyptian infant mummified in around 1000 BC, originally dismissed by archaeologists as containing the remains of a monkey. The Norse king Ivar the Boneless, who lived c. 800 CE, is speculated to have had OI as well. Nicolas de Malebranche is often credited as being the first person to describe the physical characteristics of OI in his 1688 book The Search after Truth, in which he describes a man who has had his "bones broken in the places a murderer's would be" all his life. His confident description of the pathology of the disorder, however, which creates what he termed «enfants monstrueux» ("monstrous children"), is scientifically void—he wrote that it was due to the mother's antepartum viewership of a public execution by breaking wheel. The earliest modern scientific studies of OI began in 1788 by Olof Jakob Ekman, who described the condition, which he termed "osteomalacia congenital", in his doctoral thesis and mentioned cases of it going back to 1678, all in the same family, through three generations. Ekman's description of the condition mentioned dwarfism, bone fragility, and bowing of the long bones. In 1831, Edmund Axmann gave a detailed description of it in himself and his two brothers, being the first to mention blue sclerae as a characteristic sign of OI. Jean Lobstein first described the mild form of the condition, today known as type I, in 1833, calling it "osteopsathyrosis idiopathica".
== Death == On March 24, 2010, Culp died at age 79 of a head injury sustained from a fall while walking near Runyon Canyon Park in Los Angeles; although Culp had apparently suffered a heart attack which caused the fall, it was the head injury that was fatal. He is buried at Sunset View Cemetery in El Cerrito. A memorial service was held at Grauman's Egyptian Theater in Los Angeles on April 10, 2010. At the time of his death, Culp had just completed performing a supporting role as Blakesley in the film The Assignment. He was also working on several screenplays, including an adaptation of the story of Terry and the Pirates that had already been accepted for filming and was scheduled to start production in Hong Kong in 2012, with Culp directing. Terry and the Pirates had been Culp's favorite comic strip as a boy, and it was his longtime wish to make a film based on it.
In the direct-to-video anniversary special Tokusou Sentai Dekaranger: 10 Years After, Kight Reidlich cloned a giant version of Abrella that he kept on Planet Highgord to help him fight the Dekarangers. However, Clone Abrella is killed by Dekaranger Robo piloted by Deka Break. Throughout the series, Abrella pilots the following Kaijuki as part of his schemes:
As of mid-2025, Singapore's total population stood at 6,110,200, of whom 3,660,200 (59.9%) were citizens and the remaining 2,450,000 (40.1%) were either permanent residents (543,800, 8.9%) or international students, foreign workers, or dependants (1,906,700, 31.2%). It is the world's largest and most populous city-state. The 2020 census reported that about 74.3% of residents were of Chinese descent, 13.5% of Malay descent, 9.0% of Indian descent, and 3.2% of other descent (such as Eurasian); this proportion was virtually identical to the 2010 census, with slight increases among Chinese and Malay (0.2% and 0.1% respectively) and minor decreases in Indian and others (0.2% and 0.1%). Prior to 2010, each person could register as a member of only one race, by default that of their father; therefore, mixed-race persons were solely grouped under their father's race in government censuses. From 2010 onward, people may register using a multi-racial classification, in which they may choose one primary race and one secondary race, but no more than two. Like other developed countries in Asia, Singapore experienced a rapid decline in its total fertility rate (TFR) beginning in the 1980s. Since 2010, its TFR has largely plateaued at 1.1 children per woman, which is among the lowest in the world and well below the 2.1 needed to replace the population. Consequently, the median age of Singaporean residents is among the highest in the world, at 42.8 in 2022 compared to 39.6 ten years earlier.
Increased entry of megakaryocytes into the systemic circulation. Under normal circumstances in healthy individuals, megakaryocytes that arise from the bone marrow are trapped in the pulmonary capillary bed and broken down before entering the systemic circulation. In disorders where there is prominent extrapulmonary shunting of blood (e.g. cyanotic heart diseases, liver cirrhosis), the megakaryocytes can bypass the breakdown within the pulmonary circulation and enter the systemic circulation. They are then trapped within the capillary beds within the extremities, such as the digits, and release PDGF and VEGF. In cases or diffuse pulmonary diseases or lung cancer, the excess VEGF produced in the diseased parts of the lungs directly enter circulation. Hypoxia induces the expression of VEGF by platelets. It also enhances the release of PFGF and VEGF by megakaryocytes. Other causes of platelet and/or endothelial cell activation, including: Overproduction of prostaglandin E by other tissues, such as in lung cancer and Crohn's disease. This is usually linked to higher levels of COX-2. Underconsumption of prostaglandin E by other tissues, such as in HPGD and/or SLCO2A1 mutations (pachydermoperiostosis, see above). Use of prostaglandin E medication. A chronic excess of platelets, such as in inflammatory bowel disease. In thyroid acropachy, the explanation leans autoimmune and probably involves a process similar to thyroid eye disease, with increased proliferation of fibroblasts and deposition of glycosamines.
Sources: en.wikipedia.org
Therefore, hyperhomocysteinemia is a possible risk factor for coronary artery disease. Coronary artery disease occurs when an atherosclerotic plaque blocks blood flow to the coronary arteries, which supply the heart with oxygenated blood. Hyperhomocysteinemia has also been correlated with the occurrence of blood clots, heart attacks, and strokes, although it is unclear whether hyperhomocysteinemia is an independent risk factor for these conditions. Hyperhomocysteinemia has also been associated with early-term spontaneous abortions and with neural tube defects.
India, in July and November 2013, demanded that the U.S. respond to allegations that the Indian UN mission in New York City and the Indian Embassy in Washington, D.C. had been targeted for spying. On July 2, 2014, U.S. diplomats were summoned by the Indian Ministry of External Affairs to discuss allegations that the National Security Agency had spied upon private individuals and political entities within India. A 2010 document leaked by Edward Snowden and published by The Washington Post revealed that US intelligence agencies had been authorized to spy on the Indian Prime Minister Narendra Modi (who was then the chief minister of Gujarat). WikiLeaks revelations that Western intelligence agencies have used foreign aid workers and staff at non-governmental organizations as non-official cover prompted India to step-up the monitoring of satellite phones and movement of personnel working for humanitarian relief organisations and development aid agencies in the vicinity of sensitive locations.
On 27 August 2025, President Luiz Inácio Lula da Silva signed Decree No. 12,595/2025, establishing the DTV+ system (also called TV 3.0) as the new standard for Brazilian free-to-air television, based on ATSC 3.0. The standard covers physical, transport, video, audio, subtitles and emergency alert layers. The preparatory phase is expected to be completed in 2025, with the first TV 3.0 transmissions beginning in the first half of 2026 in major capitals. The expansion process to reach coverage across the entire national territory is estimated to take up to 15 years. The system also incorporates internet integration, greater interactivity, accessibility and public services via the television platform. The signing of the decree followed years of studies, research, discussions and debates led by the MCom, involving companies in the sector, academics and specialists. Following the regulation, Brazilian broadcasters may begin implementing the new system. According to the minister of communications, Frederico Siqueira, the signing of the decree marked a historic moment for Brazil, strengthening free-to-air television as a democratic and popular meeting space. He highlighted that TV 3.0 will not change a central principle: free access. The new technology will modernize Brazilian digital television, offering 4K and 8K images, immersive sound, greater interactivity and integration with the internet. The goal is to provide a richer and more personalized experience for viewers, bringing free-to-air television closer to streaming services.
American kestrels in Canada and the northern United States typically migrate south in the winter, some of them converging with resident kestrels of smaller size in Mexico, sometimes going as far as Central America and the Caribbean. Birds that breed south of about 35° north latitude are usually year-round residents. Migration also depends on local weather conditions. American Kestrels breeding at lower latitudes – below 48ºN to be precise – arrive earlier after warmer springs, whereas birds from higher latitudes return to their breeding grounds at the same time each year. These patterns suggest that short-distance migrants are better able to cope with climate change. Wintering kestrels' choice of habitat varies by sex. Females are found in open areas more often than males during the non-breeding season. A common explanation for this behavior is that the larger females who are bigger than the males arrive at the preferred habitat first and exclude males from their territory. The American kestrel is not long-lived, with a lifespan of <5 years for wild birds. The oldest banded wild bird was 11 years and 7 months, while captive kestrels can live up to 14–17 years. In a study, humans accounted for 43.2% of 1,355 reported deaths, which included direct killing and roadkills, while predation (including by larger birds of prey) accounted for 2.8%. This statistic is likely biased, however, as reported deaths are usually found near or in areas populated by humans.
Automated synthesis systems find new applications with a development of new robotic platforms. Possible applications include: uncontrolled synthesis, time-dependent synthesis, radiosynthesis, synthesis in demanding conditions (low temperatures, presence of specific atmosphere like CO, H2, N2, high pressure or under vacuum) or whenever the same or similar workflow needs to be applied multiple times with the aim to: optimize reactions, synthesize many derivatives in small scale, perform reactions of iterative homologations or radiosynthesis. Automated synthesis workflows are needed both in academic research and a wide array of industrial R&D settings (pharmaceuticals, agrochemicals, fine & specialty chemicals, renewables & energy research, catalysts, polymers, ceramics & abrasives, porous materials, nanomaterials, biomaterials, lubricants, paints & coatings, home care, personal care, nutrition, forensics).
Sources: en.wikipedia.org
Liquid chromatography-tandem mass spectrometry is a common approach. It can detect the parent compound and its metabolites in biological matrices.
Research samples are typically kept frozen, desiccated, and protected from light. Stock solutions are often aliquoted to reduce freeze-thaw cycles.
High-performance liquid chromatography and nuclear magnetic resonance are standard for purity and identity. Mass spectrometry confirms molecular weight.
Research-grade SR9009 is typically stored frozen at about minus twenty degrees Celsius, protected from light and moisture. Stock solutions are often kept in aliquots to avoid repeated freeze-thaw cycles. Specific storage conditions should follow the supplier's documentation.