LC-MS/MS raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
This page was last updated on 2025-09-29 and is reviewed periodically as new material appears.
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.
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 a synthetic small molecule studied as an agonist of the nuclear receptors REV-ERBα and REV-ERBβ, also called NR1D1 and NR1D2. These receptors help regulate circadian rhythms and metabolic gene programs. The compound was developed for laboratory research, not as an approved therapeutic. Its identity is distinct from steroid hormones and selective androgen receptor modulators. Scientific interest centers on how REV-ERB activation changes gene expression in cells and animal models.
At the molecular level, SR9009 binds the ligand-binding domain of REV-ERB and strengthens recruitment of corepressor proteins such as NCoR and HDAC3. This increases repression of target genes, including Bmal1 and other clock-controlled and metabolic genes. In rodent studies, such changes have been linked to altered lipid handling, glucose metabolism, and energy expenditure. The precise chain of events between receptor binding and whole-body effects remains an active area of research. Findings in animals do not automatically translate to humans.
| 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. |
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.
Regulatory treatment of SR9009 varies by country and context. It is not approved as a therapeutic drug by agencies such as the United States Food and Drug Administration or the European Medicines Agency. Sports authorities list it as a prohibited substance; the World Anti-Doping Agency classifies it among hormone and metabolic modulators. Legal status for personal possession or sale differs across jurisdictions, and some countries may restrict it under analog or research chemical laws. Buyers who seek verified material often rely on independent laboratory testing because online product labels may not match contents.
Detection of SR9009 in biological samples usually employs liquid chromatography coupled with tandem mass spectrometry. This method can identify the parent compound and sometimes metabolites in urine or blood. Because exposure can be low and clearance may be rapid, sample timing and limits of detection matter. Laboratories validate assays for sensitivity and specificity. Results are interpreted alongside chain-of-custody and quality-control records. Urine is the common matrix for anti-doping analysis, while blood may be used in research settings.
Handling recommendations for SR9009 in a laboratory setting include storing the solid at low temperature, protected from light and moisture. The compound is often dissolved in dimethyl sulfoxide or ethanol for experiments. Solutions should be prepared with appropriate personal protective equipment and disposed of according to local rules. Stability data for long-term storage are limited, so stock solutions are typically kept cold and used within defined periods. Records of preparation date and concentration support reproducibility.
The mechanism of action involves binding to REV-ERB receptors and recruiting corepressor complexes, which represses target gene transcription. This contrasts with many nuclear receptor agonists that activate transcription. Downstream effects may include changes in autophagy, mitochondrial biogenesis, and lipid handling, but the precise pathways remain an active area of study. Whether these molecular events translate into meaningful physiological effects in humans is unresolved. Most evidence comes from cultured cells and rodent models rather than human participants.
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.
Preclinical reports describe effects on exercise endurance, mitochondrial content, and lipid profiles in rodents, but these findings come from specific experimental conditions. Many studies use high doses or delivery methods that may not translate directly to human use. SR9009 has been reported to have low oral bioavailability and a short half-life, which complicates interpretation of oral dosing studies. It is not established as safe or effective for any indication. Literature discussions often separate its pharmacological mechanism from unverified claims made in fitness and supplement markets.
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.
Plant resin is a viscoelastic solid polymer. When left in a container, it will flow slowly as a liquid to conform to the contours of its container. If struck with greater force, however, it will shatter as a solid.
In 2013, Essendon was investigated by the AFL and the Australian Sports Anti-Doping Authority (ASADA) over its 2012 player supplements program, specifically regarding the alleged use of the banned peptide Thymosin beta-4. On 27 August 2013, the AFL found the club guilty of bringing the game into disrepute for establishing a program that was "experimental, inappropriate and inadequately vetted". The club was fined A$2 million, stripped of early draft picks, and disqualified from the 2013 finals series. Senior coach James Hird was suspended for twelve months, and several executives, including chairman David Evans and CEO Ian Robson, resigned. Despite the AFL Anti-Doping Tribunal initially clearing the players in March 2015, the World Anti-Doping Agency (WADA) appealed the decision. On 12 January 2016, the Court of Arbitration for Sport overruled the AFL tribunal, finding 34 past and present players guilty of taking the banned substance. The players were suspended for the entire 2016 season. Forced to field a team composed heavily of VFL top-up players, Essendon claimed the wooden spoon in 2016 for the first time since 1933. Following the conclusion of the saga, Essendon made intermittent finals appearances, qualifying in 2017, 2019, and 2021 under coaches John Worsfold and Ben Rutten, but suffered elimination final defeats each time. The club has struggled to achieve significant post-season success, enduring a drought of finals victories that stretches back to 2004.
In Hinduism, the Upanishads say that the nature of the higher self (Brahman), in essence, is bliss (ānanda), which the self in each being (Atman) experiences during dreamless deep sleep but remains unconscious of, consciously experiencing it during sensual activity. The Upanishads say that in humans, just as eyes correspond to the experience of sight, nose with smell, ears with sound, and tongue with taste, the genitals correspond to "bliss, delight and procreation". The Brihadaranyaka Upanishad says that in humans, genitals are the "single locus of pleasure (ānanda)". In Sanskrit literature, the penis is called Upastha ("that which stands up") and is traditionally considered a "source of great power or vitality (ojas)." In Yoga physiology, the penis corresponds with svadhishthana chakra, and channels the flow of nadis, which enable higher sensations and consciousness. Consequently, circumcision, or even an interference with a tight foreskin, is strictly forbidden in Hindu traditions.
Sources: en.wikipedia.org
Therefore, when observing the nose in profile, the normal show of the columella (the height of the visible nasal aperture) is 2 mm; and the dorsum should be rectilinear (straight). When observed from below (basal view), the alar base configures an isosceles triangle, with its apex at the infra-tip lobule, immediately beneath the tip of the nose. The facially proportionate projection of the nasal tip (the distance of the nose's tip from the face) is determined with the Goode Method, wherein the projection of the nasal tip should be 55–60 percent of the distance between the nasion (nasofrontal junction) and the tip-defining point. A columellar double break might be present, marking the transition between the intermediate crus of the lower-lateral cartilage and the medial crus. The Goode Method determines the extension of the nose from the facial surface by comprehending the distance from the alar groove to the tip of the nose, and then relating that measurement (of nasal-tip projection) to the length of the nasal dorsum (eg, the line from the nasion to the nasal tip). The nasal projection measurement is obtained by delineating a right triangle with lines parting from the nasion (nasofrontal juncture) to the alar–facial–groove. Then, a second, perpendicular delineation, that traverses the tip-defining point, establishes the ratio of projection of the nasal tip; hence, the range of 0.55:1 to 0.60:1, is the ideal nasal-tip-to-nasal-length projection.
The two substrates of this enzyme are estradiol and oxidised nicotinamide adenine dinucleotide (NAD+). Its products are estrone, reduced NADH, and a proton. The enzyme can alternatively use nicotinamide adenine dinucleotide phosphate as its cofactor. This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-OH group of donor with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is estradiol-17beta:NAD(P)+ 17-oxidoreductase. Other names in common use include 20alpha-hydroxysteroid dehydrogenase, 17beta,20alpha-hydroxysteroid dehydrogenase, 17beta-estradiol dehydrogenase, estradiol dehydrogenase, estrogen 17-oxidoreductase, and 17beta-HSD. This enzyme participates in androgen and estrogen metabolism.
SUMOplot Analysis Program — predicts and scores SUMOylation sites in your protein (by Abgent) seeSUMO - prediction of SUMOylation sites SUMOsp - prediction of SUMOylation sites JASSA - Predicts and scores SUMOylation sites and SIM (SUMO interacting motif)
Sources: en.wikipedia.org
=== Research articles === Ifa, Demian R; Eberlin, Livia S (January 1, 2016), "Ambient Ionization Mass Spectrometry for Cancer Diagnosis and Surgical Margin Evaluation", Clinical Chemistry, 62 (1), Oxford University Press (OUP): 111–123, doi:10.1373/clinchem.2014.237172, ISSN 0009-9147, PMC 5315420, PMID 26555455 Sans, Marta; Gharpure, Kshipra; Tibshirani, Robert; Zhang, Jialing; Liang, Li; Liu, Jinsong; Young, Jonathan H.; Dood, Robert L.; Sood, Anil K.; Eberlin, Livia S. (May 31, 2017), "Metabolic Markers and Statistical Prediction of Serous Ovarian Cancer Aggressiveness by Ambient Ionization Mass Spectrometry Imaging", Cancer Research, 77 (11), American Association for Cancer Research (AACR): 2903–2913, doi:10.1158/0008-5472.can-16-3044, ISSN 0008-5472, PMC 5750373, PMID 28416487 Santagata, Sandro; Eberlin, Livia S.; Norton, Isaiah; Calligaris, David; Feldman, Daniel R.; Ide, Jennifer L.; Liu, Xiaohui; Wiley, Joshua S.; Vestal, Matthew L.; Ramkissoon, Shakti H.; Orringer, Daniel A.; Gill, Kristen K.; Dunn, Ian F.; Dias-Santagata, Dora; Ligon, Keith L.; Jolesz, Ferenc A.; Golby, Alexandra J.; Cooks, R. Graham; Agar, Nathalie Y. R. (June 30, 2014), "Intraoperative mass spectrometry mapping of an onco-metabolite to guide brain tumor surgery", Proceedings of the National Academy of Sciences, 111 (30): 11121–11126, Bibcode:2014PNAS..11111121S, doi:10.1073/pnas.1404724111, ISSN 0027-8424, PMC 4121790, PMID 24982150 Correa, Deleon N.; Santos, Jandyson M.; Eberlin, Livia S.; Eberlin, Marcos N.; Teunissen, Sebastiaan F.
== See also == Attack rate Basic reproduction number Flatten the curve List of COVID-19 simulation models Mathematical modelling in epidemiology Modifiable areal unit problem Next-generation matrix Risk assessment
=== Fermentation === Possibly the world's oldest fermented beverage, dating from 9,000 years ago, mead ("honey wine") is the alcoholic product made by adding yeast to honey-water must and fermenting it for weeks or months. The yeast Saccharomyces cerevisiae is commonly used in modern mead production. Mead varieties include drinks called metheglin (with spices or herbs), melomel (with fruit juices, such as grape, specifically called pyment), hippocras (with cinnamon), and sack mead (high concentration of honey), many of which have been developed as commercial products numbering in the hundreds in the United States. Honey is also used to make mead beer, called "braggot".
Grizard, G; Sion, B; Bauchart, D; Boucher, D (31 March 2000). "Separation and quantification of cholesterol and major phospholipid classes in human semen by high-performance liquid chromatography and light-scattering detection". Journal of Chromatography B: Biomedical Sciences and Applications. 740 (1): 101–7. doi:10.1016/S0378-4347(00)00039-6. PMID 10798299. SUNY Podcast – Semen study results Hyena, Hank (August 21, 2000). "The quest for sweet semen". Salon.
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 research compound that activates the REV-ERBα and REV-ERBβ nuclear receptors. It is not an approved drug and has no established human therapeutic use. Most published biological data come from cell and rodent studies.