If you have been reading about HPLC-MS 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 2026-02-04. Numbers and descriptions here follow the published literature rather than marketing material.
SR9009 is a synthetic small molecule studied as an agonist of the nuclear receptors REV-ERBα and REV-ERBβ. It is not an approved medicine and has no established human therapeutic use. The compound appears in scientific literature as a tool for probing circadian and metabolic regulation. Online sellers often label it as a research chemical, sometimes using the nickname Stenabolic. Its chemical identity is distinct from selective androgen receptor modulators, stimulants, and peroxisome proliferator-activated receptor delta agonists. Researchers use it mainly in cell and animal experiments.
At the molecular level, SR9009 binds REV-ERBα and REV-ERBβ and alters their repressive activity on target genes. These nuclear receptors help regulate the circadian clock, lipid synthesis, glucose metabolism, and inflammatory pathways. By changing transcription, the compound can shift the timing or magnitude of downstream metabolic processes in model systems. It does not act through androgen receptors or adenosine receptors, which distinguishes it from several substances sold for athletic performance. Whether the same transcriptional changes occur in humans at tolerable exposures remains an open question because controlled human studies are lacking.
Laboratory identification of SR9009 typically relies on chromatographic separation coupled to mass spectrometry, often with ultraviolet detection as a secondary check. Nuclear magnetic resonance spectroscopy can confirm molecular structure when a reference standard is available. Because many suppliers sell the compound as a research chemical, independent identity testing is important for experimental reproducibility. A single retention time is not sufficient proof of identity, especially when related compounds may be present. Purity assessments usually report a percentage based on area normalization.
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.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C20H24ClN3O4S | Derived from published structure. |
| Molecular weight | 437.94 g/mol | Calculated value. |
| Appearance | White to off-white solid | Typical for purified research samples. |
| Solubility | DMSO, ethanol; low in water | Class: poorly water-soluble. |
| Typical storage | -20 °C, desiccated, protected from light | Limits degradation. |
Laboratory samples of SR9009 are typically handled as research chemicals rather than pharmaceuticals. Suppliers usually state that the material is for research use only and not for human or veterinary administration. Storage recommendations generally call for a freezer at approximately −20 °C, protection from light, and a desiccated environment. The solid is often described as a white to off-white powder. Solubility is commonly reported in organic solvents such as dimethyl sulfoxide and ethanol, with low solubility in water.
Analytical identification and purity assessment often use high-performance liquid chromatography with ultraviolet detection or mass spectrometry. Liquid chromatography–tandem mass spectrometry is used to detect and quantify SR9009 in biological matrices, including urine and blood, for anti-doping or pharmacokinetic studies. Nuclear magnetic resonance spectroscopy can confirm molecular structure. Stability depends on form and storage: the solid is generally more stable than solutions, and repeated freeze–thaw cycles may degrade samples. Purity is typically reported as a percentage from a certificate of analysis.
SR9009 is a synthetic small molecule developed as an agonist of the nuclear receptors REV-ERBα (NR1D1) and REV-ERBβ (NR1D2). These receptors help regulate circadian rhythms and metabolic gene expression. In cell and animal studies, SR9009 alters transcription of genes involved in lipid metabolism, inflammation, and mitochondrial function. It is not an approved medicine, and its pharmacological profile in humans remains largely uncharacterized. The compound is frequently discussed in the context of circadian biology and metabolic research rather than clinical use.
Preclinical reports have linked SR9009 to improved endurance and altered energy expenditure in rodents. Such findings have prompted interest in whether REV-ERB activation can influence skeletal muscle metabolism. However, the reported effects depend on dose, route, and experimental model, and replication across laboratories is limited. Human trials have not established comparable outcomes, so claims about exercise performance remain speculative. The absence of controlled human data is a central limitation in interpreting these observations.
Peter Thomas DeMarco (March 6, 1932 – October 26, 2005) was an American physician who graduated from Albright College in Pennsylvania and achieved his doctor of medicine degree in 1957 from Hahnemann Medical College of Philadelphia, Pennsylvania. He had a research laboratory and a medical practice in Pine Hill, New Jersey. He treated patients with procaine polyvinylpyrrolidone (PVP), but his medical license was suspended in New Jersey and Pennsylvania for using the unapproved therapy after an experimental permit for Procaine-PVP was withdrawn. The FDA also said his therapy might cause cancer. This was a common misconception in the 1970s. Later research revealed procaine has anti-cancer effects in human cancer cells.
== Effects == Guanylate cyclase is found in the retina (RETGC) and modulates visual phototransduction in rods and cones. It is part of the calcium negative feedback system that is activated in response to the hyperpolarization of the photoreceptors by light. This causes less intracellular calcium, which stimulates guanylate cyclase-activating proteins (GCAPs). Studies have shown that cGMP synthesis in cones is about 5-10 times higher than it is in rods, which may play an important role in modulating cone adaption to light. In addition, studies have shown that zebrafish express a higher number of GCAPs than mammals, and that zebrafish GCAPs can bind at least three calcium ions. Guanylate cyclase 2C (GC-C) is an enzyme expressed mainly in intestinal neurons. Activation of GC-C amplifies the excitatory cell response that is modulated by glutamate and acetylcholine receptors. GC-C, while known mainly for its secretory regulation in the intestinal epithelium, is also expressed in the brain. To be specific, it is found in the somata and dendrites of dopaminergic neurons in the ventral tegmental area (VTA) and the substantia nigra. Some studies implicate this pathway as having a role in attention deficiency and hyperactive behavior. Soluble guanylate cyclase contains a molecule of heme, and is activated primarily by the binding of nitric oxide (NO) to that heme. sGC is primary receptor for NO a gaseous, membrane-soluble neurotransmitter.
it is believed to be the first prosecution of its kind. Dorset Police announce that no criminal offences were committed in relation to the 2023 Bournemouth beach incident in which two people were killed. 17 July – NHS consultants in England announce a further two days of strike action, on 24 and 25 August. 20 July – Parliamentary by-elections take place in Somerton and Frome, Uxbridge and South Ruislip, and Selby and Ainsty. 21 July – 21 July – July 2023 by-elections: Uxbridge and South Ruislip: The former seat of ex-PM Boris Johnson is held by the Conservatives, but with a reduced majority of 495 votes. Steve Tuckwell becomes the constituency's MP. The proposed ULEZ expansion by Labour's Sadiq Khan, Mayor of London, is a factor in the result. Selby and Ainsty: Labour takes the formerly safe Conservative seat of Selby and Ainsty. The swing of 23.7% is the largest since 1945. Keir Mather becomes the constituency's new MP, and at 25, the youngest Member of Parliament and Baby of the House. Somerton and Frome: The Liberal Democrats take Somerton and Frome, overturning a Conservative majority of 29.6%. Sarah Dyke is elected as the constituency's new MP. Planned strikes on the London Underground from 23 to 28 July are called off following last minute talks between union representatives and Transport for London. The Association of School and College Leaders, which represents headteachers in England, votes to accept 6.5% pay rise.
Sources: en.wikipedia.org
== Meat == In butchery and gastronomy, the epimysium is often called silverskin, and is thought of as a kind of gristle. It remains tough, chewy, and inedible when cooked, and is often trimmed away before cooking.
=== As a biochemical tool === Concanavalin A and other commercially available lectins have been used widely in affinity chromatography for purifying glycoproteins. In general, proteins may be characterized with respect to glycoforms and carbohydrate structure by means of affinity chromatography, blotting, affinity electrophoresis, and affinity immunoelectrophoreis with lectins, as well as in microarrays, as in evanescent-field fluorescence-assisted lectin microarray.
== Chemical synthesis and manipulation of carbohydrates == Carbohydrate synthesis is a sub-field of organic chemistry concerned specifically with the generation of natural and unnatural carbohydrate structures. Carbohydrate chemistry is a large and economically important branch of organic chemistry. This can include the synthesis of monosaccharide residues or structures containing more than one monosaccharide, known as oligosaccharides. Selective formation of glycosidic linkages and selective reactions of hydroxyl groups are very important, and the usage of protecting groups is extensive. Some of the main organic reactions that involve carbohydrates are:
Sources: en.wikipedia.org
SR9009 is a synthetic REV-ERB agonist used in laboratory research. It is not an approved drug, and its effects in humans are not well characterized. It is often sold as a research chemical under the name Stenabolic.
No. SR9009 targets the nuclear receptors REV-ERBα and REV-ERBβ, not the androgen receptor. This mechanism differs from selective androgen receptor modulators and from exercise mimetics that act on PPARδ.
Published evidence is mainly preclinical, using cell cultures and animal models. Controlled human trials are not well documented in the public literature. Claims about human performance or health effects therefore remain unsupported by robust clinical data.
Liquid chromatography with mass spectrometry is a common approach. Ultraviolet detection and nuclear magnetic resonance can support identification when suitable standards are available.