The short version of LC-MS/MS fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2026-07-16. Anything still debated is marked as such rather than presented as settled.
SR9009 is generally described as poorly soluble in water and more soluble in organic solvents such as dimethyl sulfoxide and ethanol. Stock solutions are commonly prepared in an organic solvent before dilution into an aqueous buffer or vehicle. Precipitation can occur if the organic fraction is reduced too quickly or if the final concentration exceeds the compound's solubility limit. Sonication or gentle warming may aid dissolution in some protocols, but excessive heat can promote degradation. Container material and pH can also influence observed solubility.
For long-term storage, SR9009 is typically kept as a solid at low temperature, protected from moisture and light. Desiccated conditions limit hydrolysis, while opaque containers reduce photochemical breakdown. Solutions are less stable than solids and are often stored frozen in aliquots to avoid repeated freeze-thaw cycles. Stability data are not standardized across all suppliers, so users should rely on certificate-of-analysis information when available. Degradation may appear as color change, precipitate, or decreased chromatographic purity.
SR9009 is a synthetic small molecule studied as a REV-ERB agonist. REV-ERBα and REV-ERBβ are nuclear receptors that help regulate circadian rhythms and metabolic gene expression. The compound was identified in academic screening efforts to find synthetic ligands for these receptors. In cell and animal studies, SR9009 alters transcription of genes involved in lipid and glucose metabolism, and it can shift circadian behavior. It is not an approved therapeutic agent.
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.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white powder | Visual inspection is not sufficient for identity. |
| Solubility | Soluble in DMSO and ethanol | Low solubility in water; stock solutions use organic solvent. |
| Storage | -20°C, desiccated, protected from light | Limits hydrolysis and photodegradation. |
| Analytical method | HPLC-UV/MS | Used for identity and purity assessment. |
| Synonyms | SR9009, Stenabolic | Naming varies by supplier. |
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.
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.
Regulatory treatment of SR9009 reflects its investigational status. The compound has no approved human therapeutic indication, and sports authorities prohibit its use. It appears on anti-doping lists as a non-approved substance or metabolic modulator, depending on the list version. Products sold online as research chemicals are not quality-controlled medicines, so their identity and purity can differ from the label. Such products may also contain unlisted compounds, which complicates both testing and safety assessment.
Scientific discussion of SR9009 often separates animal evidence from human anecdote. Rodent studies provide controlled data on endurance, metabolism, and gene expression, but they use specific strains, doses, and treatment durations. Human reports are mostly uncontrolled and cannot establish cause and effect. Open questions include oral bioavailability, tissue distribution, metabolic stability, and long-term effects. Review articles generally call for more rigorous pharmacokinetic and safety research before any clinical use could be considered.
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.
Stability depends on physical form, temperature, light exposure, and solvent. Solid SR9009 is generally stored cold and dry, with protection from light to limit degradation. Dimethyl sulfoxide stocks are common for laboratory work, but repeated freeze-thaw cycles can reduce compound integrity. Aqueous solutions may be less stable than organic stocks, and the ethyl ester in the structure can be susceptible to hydrolysis under certain conditions. Researchers typically validate storage conditions and recheck purity before quantitative experiments, especially when using archived material.
=== Axonotmesis === Axonotmesis is a more severe nerve injury with disruption of the neuronal axon, but with maintenance of the epineurium. This type of nerve damage may cause paralysis of the motor, sensory, and autonomic functions, and is mainly seen in crush injury. If the force creating the nerve damage is removed in a timely fashion, the axon may regenerate, leading to recovery. Electrically, the nerve shows rapid and complete degeneration, with loss of voluntary motor units. Regeneration of the motor end plates will occur, as long as the endoneural tubules are intact. Axonotmesis involves the interruption of the axon and its covering of myelin, but with preservation of the connective tissue framework of the nerve (the encapsulating tissue, the epineurium and perineurium, are preserved). Because axonal continuity is lost, Wallerian degeneration occurs. Electromyography (EMG) performed 2 to 4 weeks later shows fibrillations and denervation potentials in musculature distal to the injury site. Loss in both motor and sensory spines is more complete with axonotmesis than with neurapraxia, and recovery occurs only through regenerations of the axons, a process requiring time. Axonotmesis is usually the result of a more severe crush or contusion than neurapraxia, but can also occur when the nerve is stretched (without damage to the epineurium). There is usually an element of retrograde proximal degeneration of the axon, and for regeneration to occur, this loss must first be overcome.
==== Combination drugs ==== Butalbital/acetaminophen (Butapap) – combination of butalbital (GABAA receptor positive allosteric modulator and barbiturate) and acetaminophen (analgesic) Ergotamine/caffeine (Cafergot) – combination of ergotamine (non-selective monoamine receptor modulator and ergoline) and caffeine (adenosine receptor antagonist) Ergotamine/chlorcyclizine/caffeine (Anervan) – combination of ergotamine (non-selective monoamine receptor modulator and ergoline), chlorcyclizine (antihistamine and other actions), and caffeine (adenosine receptor antagonist) Meloxicam/rizatriptan (AXS-07; Symbravo) – combination of meloxicam (COX inhibitor/NSAID) and rizatriptan (triptan) [139] Naproxen sodium/sumatriptan (MT-400; SumaRT/Nap; Suvexx; Trexima; Treximet) – combination of naproxen (COX inhibitor/NSAID) and sumatriptan (triptan) – migraine [140] Paracetamol/codeine/buclizine (Migraleve Yellow) – combination of paracetamol (analgesic) and codeine (opioid) Paracetamol/codeine/buclizine (Migraleve Pink) – combination of paracetamol (analgesic), codeine (opioid), and buclizine (antihistamine and other actions) Paracetamol/dichloralphenazone/isometheptene (Amidrine) – combination of paracetamol (analgesic), dichloralphenazone (phenazone (COX inhibitor/NSAID) and chloral hydrate (GABAA receptor positive allosteric modulator)), and isometheptene (adrenergic receptor agonist) Paracetamol/metoclopramide (Paramax) – combination of paracetamol (analgesic) and metoclopramide (various actions) Sumatriptan/naproxen (Treximet) – combination of sumatriptan (triptan) and naproxen (COX inhibitor/NSAID)
As for snack food, the now popular tramezzini were first served in a historic café of downtown Turin, namely Caffè Mulassano, where they were devised in 1925 as an alternative to English tea sandwiches. In recent years, another trademark drink of the city is MoleCola, an Italian cola that entered production in 2012 and quickly spread both in Italy and outside its native country. Local cuisine also features a particular type of pizza, so-called pizza al padellino or pizza al tegamino, which is basically a small-sized, thick-crust and deep-dish pizza typically served in several Turin pizza places. Since the mid-1980s, Piedmont has also benefited from the start of the Slow Food movement and Terra Madre, events that have highlighted the rich agricultural and vinicultural value of the Po Valley and northern Italy.
Sources: en.wikipedia.org
=== Washed red blood cells === Red blood cell concentrates still contain a small amount of plasma after standard processing (usually 10-15 mL). In order to reduce the risk of allergic reactions to plasma proteins, or to modify the red blood cell concentrates for patients who are sensitive to IgA or potassium ions (K+), the red blood cell concentrates can be washed. Washing typically consists of diluting the red blood cells in saline-based washing solution or red blood cell additive solutions and then washing away any remaining plasma and debris during one or several centrifugation cycles. The process can be performed manually, or with an automated cell washer or processor.
Clindamycin/benzoyl peroxide, sold under the brand name Benzaclin among others, is a topical gel used for the treatment of acne. It is a fixed-dose combination of clindamycin, as the phosphate, an antibiotic; and benzoyl peroxide, an antiseptic. Common side effects include peeling, itching, and dryness of the skin where the gel was applied. Clindamycin/benzoyl peroxide was approved for medical use in the United States in December 2000. It is available as a generic medication.
== Toxicity == Toxicity data in humans are limited, although laboratory studies indicate that certain compounds in the bark and roots or their extracts may cause adverse effects when consumed in excess. Supplementation with M. oleifera leaf extract is potentially toxic at levels exceeding 3,000 mg/kg of body weight, but safe at levels below 1,000 mg/kg. A study on albino mice found that high levels (>5,000mg/kg) of consumption could impair renal function. M. oleifera may interfere with prescription drugs affecting cytochrome P450 (including CYP3A4) and may inhibit the antihyperglycemic effect of sitagliptin. In November 2025, Food Standards Australia New Zealand (FSANZ) rejected an application to approve Moringa oleifera leaves, immature pods, and oil as a novel food. The decision cited insufficient evidence to confirm its safety for human consumption as a food. As a result (confirmed in May 2026 via Department of Agriculture notices), Moringa is not permitted as food or a food ingredient for retail sale in Australia.
Sources: en.wikipedia.org
Soon after, Colombia achieved some degree of political stability, which was interrupted by a bloody conflict that took place between the late 1940s and the early 1950s, a period known as La Violencia ("The Violence"). Its cause was mainly mounting tensions between the two leading political parties, which subsequently ignited after the assassination of the Liberal presidential candidate Jorge Eliécer Gaitán on 9 April 1948. The ensuing riots in Bogotá, known as El Bogotazo, spread throughout the country and claimed the lives of at least 180,000 Colombians. Colombia entered the Korean War when Laureano Gómez was elected president. It was the only Latin American country to join the war in a direct military role as an ally of the United States. Particularly important was the resistance of the Colombian troops at Old Baldy. The violence between the two political parties decreased first when Gustavo Rojas deposed the President of Colombia in a coup d'état and negotiated with the guerrillas, and then under the military junta of General Gabriel París.
== Enzyme mechanism == Cystathionase uses pyridoxal phosphate to facilitate the cleavage of the sulfur-gamma carbon bond of cystathionine, resulting in the release of cysteine. The lysine residue reforms the internal aldimine by kicking off α-iminobutyric acid. Afterwards the external ketimine is hydrolyzed, causing the formation of α-ketobutyrate. The amino group on cystathionine is deprotonated and undergoes a nucleophilic attack of the internal aldimine. An additional deprotonation by a general base results in the formation of the external aldimine and removal of the lysine residue. The basic lysine residue is then able to deprotonate the alpha carbon, pushing electron density into the nitrogen of the pyridine ring. Pyridoxal phosphate is necessary to stabilize this carbanionic intermediate; otherwise the proton's pKa would be too high. The beta carbon is then deprotonated, creating an alpha-beta unsaturation and pushing a lone pair onto the aldimine nitrogen. To reform the aldimine, this lone pair pushes back down, cleaving the sulfur-gamma carbon bond, resulting in the release of cysteine. A pyridoxamine derivative of vinyl glyoxylate remains after the gamma elimination. The lone pair from the pyridine nitrogen pushes electron density to the gamma carbon, which is protonated by lysine. Lysine then attacks the external aldimine, pushing electron density to the beta carbon, which is protonated by a general acid. The imine is then hydrolyzed to release α-ketobutyrate. Deprotonation of the lysine residue causes ammonia to leave, thus completing the catalytic cycle.
Weapons-grade plutonium contains less than 7% 240Pu. Fuel-grade plutonium contains 7%–19%, and power reactor-grade contains 19% or more 240Pu. Supergrade plutonium, with less than 4% of 240Pu, is used in United States Navy weapons stored near ship and submarine crews, due to its lower radioactivity. Plutonium-238 is not fissile but can undergo nuclear fission easily with fast neutrons as well as alpha decay. All plutonium isotopes can be "bred" into fissile material with one or more neutron absorptions, whether followed by beta decay or not. This makes non-fissile isotopes of plutonium a fertile material.
Amarasate is a supplement developed to trigger the "Bitter Brake" satiety mechanism, whereby bitter foods targeted to the small intestine trigger the release of the same appetite suppressing gut hormones that are typically elevated after a meal. The Bitter Brake concept was developed based on a combination of historical data supporting the use of bitter foods as a means to suppress appetite, and the discovery of bitter taste receptors (TAS2Rs) in appetite regulating enteroendocrine cells of the gastrointestinal tract. In vitro and biopsy research had identified TAS2Rs throughout the gastrointestinal tract and over 900 plant compounds were tested, with amarasate found to be a potent TAS2R activator. The role of gastrointestinal taste receptors has been examined in animal and human trials and a 2021 meta-analysis determined that pre-meal treatment with bitter compounds reduced energy intake, concluding that "bitter stimuli are most potent to influence eating behaviour".
Sources: en.wikipedia.org
Liquid chromatography with mass spectrometry is a common approach. Ultraviolet detection and nuclear magnetic resonance can support identification when suitable standards are available.
The solid is generally kept cold, dry, and protected from light. Solutions are often frozen in single-use aliquots to reduce repeated freeze-thaw cycles.
It indicates a material sold for laboratory study, not for human use. The label does not guarantee pharmaceutical purity, sterility, or regulatory approval.
SR9009 is a synthetic compound investigated as an agonist of the nuclear receptors REV-ERBα and REV-ERBβ. It is used in preclinical research on circadian rhythm and metabolism. It is not an approved drug.